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Read about Emma. Loud music played, and water rippled. What made ripples?
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1st Grade Science
Practice Test 4 for 1st Grade Science: real questions and explanations from the Varsity Tutors practice-test pool.
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Question 1 of 25
Read about Emma. Loud music played, and water rippled. What made ripples?
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Read about Emma. Loud music played, and water rippled. What made ripples?
Explanation: This question assesses the skill 1-PS4-1: Plan and conduct investigations to provide evidence that vibrating materials can make sound and that sound can make materials vibrate - specifically the part where sound makes materials vibrate. Sound is vibrations traveling through air. When sound reaches other objects, the vibrations can make those objects vibrate too. We can see this when lightweight materials like paper, rice, sand, or water shake, bounce, or move because of sound, and loud sounds make bigger vibrations we can see more easily. In this story, Emma played loud music from a speaker, which made music sounds, and the sound vibrations traveled to the cup water and made it ripple. This shows sound can make materials vibrate. The correct answer says "The music sound from the speaker made ripples." which identifies sound as the cause of the water's vibration. This is correct - the music made the ripples, as sound vibrations transfer to nearby materials. A distractor like "The cup water ripples made the music sound louder." is wrong because it reverses cause-effect. Students might choose this if they focus on visible action not invisible sound waves. Do demonstrations students can see: put rice on drum and tap it, hold paper near speaker, watch water ripples near loud sound. Ask "What made the water move?" Connect sound to movement. Try loud vs soft sounds - which makes more movement? Let students gently touch vibrating surface (table when drum plays on it) to feel sound vibrations. Explain: sound is invisible shaking air, when sound reaches other objects it can make them shake too. Watch for: students who only notice visible actions (tapping, touching) without connecting to sound's effect.
Look at Sofia’s flag tests. What did Sofia learn from testing? Test 1: 20 feet sunny—SUCCESS. Test 2: 50 feet sunny—SUCCESS. Test 3: 20 feet rainy—PARTIALLY WORKED. Test 4: night—FAILED.
Explanation: This question tests understanding of 1-PS4-4: Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance - specifically testing visibility conditions. Testing means trying out the device to see if it works. We test multiple times in different conditions (distance, weather, time of day) to learn when device works best and when it does not work. Sofia tested her flag in 4 trials. Tests included: two sunny distance tests (both successful), one rainy test (partially worked), and one night test (failed). Results: 2 fully successful tests in sunny conditions, 1 partial success in rain, 1 complete failure at night. Pattern discovered: device works when there's light to see the flag but NOT in darkness. The correct answer says "It worked in daylight, but did not work at night without light" which accurately describes the pattern from test results. This is supported by evidence: Tests 1-2 succeeded in sun, Test 3 partially worked with some daylight despite rain, Test 4 failed at night. The answer shows understanding that visual signals need light to be seen. Option B claims "It worked best at night, but did not work on sunny days" which is wrong because it reverses the actual results - the flag worked in sunny conditions and failed at night. Students might choose this if they confuse when visual signals work or misread the test data. Help students analyze test results by creating charts: Test # | Light Condition | Success Level. Have students identify the pattern: "Flags need light to be seen!" Emphasize that visual communication devices depend on visibility conditions. Practice sorting results: "Full success in sun, partial in rain (less light), failure at night (no light)." Watch for students who don't connect light levels to visibility of visual signals.
Look at Sofia’s flag tests: Plan—see signals from different places. Test 1: 20 feet sunny—SUCCESS. Test 2: 50 feet sunny—SUCCESS. Test 3: 20 feet cloudy—PARTIALLY WORKED. Test 4: night—FAILED. When did the device work best?
Explanation: This question relates to the skill 1-PS4-4: Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance - testing device part. Testing means trying out the device to see if it works, and we test multiple times in different conditions like near or far, day or night, quiet or noisy to learn when the device works best and when it does not. Good testing includes multiple trials, recording results as success or fail, and noticing patterns like it works in some conditions but not others, which helps us learn problems so we can improve the device, and recording results helps us remember what we learned. Sofia tested the flag in 4 trials with conditions including sunny at 20 and 50 feet, cloudy at 20 feet, and night; tests 1 and 2 succeeded fully in sunny, test 3 partially in cloudy, and test 4 failed at night. The correct answer says 'The flag worked best on sunny days, even from 50 feet away' which accurately describes the conditions when the device works best, supported by evidence from tests 1 and 2 succeeding in sunny conditions at both distances. A distractor like 'The flag worked best at night when it was very dark' is wrong because it focuses on the wrong variable and reverses success, as test 4 failed at night, and students might choose this if they do not track multiple test results. Help students analyze test results by creating simple charts: Test # | Condition | Success? Have students identify patterns: 'When did it work? When did it NOT work? What's the pattern?' Emphasize: multiple tests needed because conditions change, one test is not enough; explain that failed tests are good - they show what to improve! If all tests succeed, we might test in too-easy conditions; practice: '3 out of 4 tests worked = mostly works, but needs improvement for dark or cloudy.' Connect to iteration: test results tell us what to change; watch for students who give up after one failure, or who think any failure means device is broken, or who do not notice patterns across multiple tests.
At the science center, Chen and Sofia had a problem: books fell when carried. They made two tray designs. Design A was a flat board with no edges. Design B was a board with raised edges. When they tested the designs, they did the same test: they put 3 books on each tray and walked 10 steps. They collected data by counting how many books fell. Results: A had 2 books fall, B had 0 books fall. They used tally marks to record. Why did they test both designs the same way?
Explanation: This question tests the 1st grade skill of collecting data from tests of two objects designed to solve the same problem (K-2-ETS1-3: Analyze data from tests of two objects). When we have two different designs that try to solve the same problem, we test them both to collect data (information) about how well each one works. Fair testing means doing the same test to both designs under the same conditions (same number of items, same amount of force, same distance, same measurement method). Data is the information we collect from testing - it can be numbers we count (how many books fell?), measurements (how high can we reach?), observations we make (did it tip over - yes or no?), or comparisons (which held more?). We record this data so we can look at it and compare the two designs. Testing and collecting data gives us evidence about how each design performs, which helps us decide which design works better for solving the problem. In this scenario, the problem was books falling when carried. Two designs were created: Design A was a flat board with no edges and Design B was a board with raised edges. They tested both designs by putting 3 books on each tray and walking 10 steps. They collected data showing A had 2 books fall, B had 0 books fall. Choice A is correct because it accurately states purpose correctly: explains that testing provides evidence for comparison; describes fair testing: explains same procedure used for both. For example, so the results are fair and easy to compare, as they used the same test for both designs. Choice B represents unfair test. This error typically occurs when students don't understand need for same test for both designs, skip data collection and jump to conclusions. To help students understand testing and data collection: Actually test two designs side by side with students watching; explicitly state 'this is the data we're collecting' (how many, how much, yes/no, measurements); use simple data tables showing Design A results and Design B results; emphasize fair testing (same test for both - if we put 3 books on A, we put 3 books on B too); record data as you collect it (write numbers, make tallies, check yes/no); distinguish between building designs and testing designs (two separate steps). Watch for: students who think testing means just trying it once without recording anything, who don't see why same test matters, who confuse materials with data, who describe process but not results, who want to jump to 'which is better' before collecting data, or who think watching is the same as recording data. Key concepts: (1) test both designs same way (fair), (2) collect specific data (numbers, measurements, observations), (3) record data so you can compare, (4) data = evidence about how designs perform.
Chen looks up each night and sees many stars. Each day, he sees none. What pattern do you see?
Explanation: This question tests the 1st grade skill of describing when stars can be seen in the sky - at night versus during the day (1-ESS1-1: Use observations of stars to describe patterns that can be predicted). Stars are visible in the sky at nighttime when it is dark, but they are not visible during the daytime when the sky is bright and sunny. This pattern is predictable and happens every day: when the sun goes down and it gets dark (nighttime), we can see many stars in the sky; when the sun comes up and it gets bright (daytime), we cannot see stars anymore. The stars are always there, but the bright sunlight during the day makes them impossible to see, while the dark night sky lets us see their light. In this observation, Chen looks up each night and sees many stars, but each day he sees none, showing a consistent, predictable pattern over multiple observations. Choice B is correct because it accurately states that stars are visible at night but not in day, which matches Chen's repeated observations and identifies the predictable pattern. Choice D reflects the error of thinking stars show up at random times, which typically occurs when students haven't yet recognized that the day/night star visibility follows a predictable pattern that happens every single day. To help students understand: Observe and draw the sky at daytime and nighttime; look for stars at nighttime (with adult) and note you cannot see them during day; discuss how both skies are 'real' but show different things; use picture comparisons; keep a simple chart for several days marking 'day: no stars visible, night: many stars visible.' Watch for: students who think stars don't exist during the day (they're there, just not visible), who expect to see stars during daytime if they look hard enough, who confuse stars with other sky objects like moon, or who think pattern is random rather than predictable every day/night.
Jamal wrote: In winter the sun comes up later and goes down earlier. What does that mean about winter daylight?
Explanation: This question tests the 1st grade skill of making observations about the amount of daylight at different times of year (1-ESS1-2: Make observations at different times of year to relate the amount of daylight to the time of year). The amount of daylight (hours when the sun is up and it's light outside) changes during the year. In summer (June, July, August), there are many hours of daylight - the sun comes up early in the morning and doesn't go down until late in the evening. In winter (December, January, February), there are fewer hours of daylight - the sun comes up later in the morning and goes down earlier in the evening. This means summer days are longer (more light) and winter days are shorter (less light), and this pattern repeats every year. In this note, Jamal wrote that in winter the sun comes up later and goes down earlier. This evidence shows winter has shorter daylight due to later sunrise and earlier sunset. Choice A is correct because it accurately states winter has fewer hours of daylight. This matches the observations that later sunrise and earlier sunset mean less time for daylight in winter. Choice B represents reversed seasons claiming winter has more daylight. This error typically occurs when students confuse which season is which, remember weather characteristics instead of daylight pattern, think bright sunny winter day = more daylight, don't compare observations from different times of year, reverse cause and effect, haven't personally observed pattern over full year. To help students understand: Compare observations from summer and winter (sunrise/sunset times, or when it gets dark relative to daily activities like dinner or bedtime); keep a simple monthly chart marking when sun rises/sets or when it gets dark outside; notice seasonal changes by observing same time of day across months (like 'Is it light or dark at 6pm?' in different months); discuss personal experiences (staying up later in summer while still light out, getting dark earlier in winter). Watch for: students confusing temperature with daylight (thinking hot days = more daylight), thinking daylight doesn't change or changes randomly, reversing summer/winter patterns, or focusing on weather (sunny/cloudy) instead of seasonal pattern. Key concept: amount of daylight predictably changes through the year - most in summer, least in winter.
Read Amir’s rabbit chart. What does it show about heredity?
Explanation: This question aligns with the skill 1-LS3-1, where students make observations to construct an evidence-based account that young plants and animals are like, but not exactly like, their parents, focusing on recording similarities. Offspring inherit traits from their parents through heredity, which means babies get features like color, size, shape, body structures such as fur or leaves, and some behaviors from their parents' genes. This happens in all living things, so when we observe parents and offspring, we see many similarities because the young inherit these instructions that determine their traits. Amir observed the parent rabbit and baby rabbits, recording features like ears, fur, and legs, and compared them, finding that the chart shows multiple features are the same or very similar, such as the babies having long ears and soft fur just like the parent, showing heredity. The correct answer says 'Observations show baby rabbits have long ears, soft fur, and hopping legs like the parent—traits are passed down,' which accurately identifies the multiple similarities observed, proving offspring inherit traits from parents with clear evidence like matching ear shape and fur. A distractor like 'Observations show baby rabbits are exactly the same size as the parent rabbit in the chart' is wrong because it claims identical size when offspring are similar but smaller, and students might choose this if they think offspring are exact copies or focus on size differences. To teach this, help students create comparison charts with categories like appearance and body parts, tally matching features, and use rabbit families to emphasize that offspring are similar but not identical, distinguishing inherited traits like hopping from learned behaviors.
Look at Emma’s flashlight code tests: 1 flash=come, 2=yes, 3=no. Plan: Can brother see and understand? Test 1: night, 1 flash—SUCCESS. Test 2: night, 2 flashes—SUCCESS. Test 3: night, 3 flashes—SUCCESS. Test 4: bright day, 1 flash—FAILED. Which test showed the device did NOT work?
Explanation: This question tests understanding of 1-PS4-4: Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance - specifically identifying failed tests. Testing means trying out the device to see if it works. We test multiple times in different conditions to learn when device works best and when it does not work. Failed tests are valuable - they show us what conditions cause problems. Emma tested her flashlight code in 4 trials. Tests included: Test 1 (night, 1 flash) - SUCCESS; Test 2 (night, 2 flashes) - SUCCESS; Test 3 (night, 3 flashes) - SUCCESS; Test 4 (bright day, 1 flash) - FAILED. Results: all night tests succeeded, the bright day test failed. Pattern discovered: flashlight signals work at night but fail in bright daylight. The correct answer says "Test 4: 1 flash in bright day" which accurately identifies the only test marked as FAILED. This is supported by evidence: Test 4 explicitly states "FAILED (too sunny)" while Tests 1-3 all show SUCCESS. The answer shows understanding that bright sunlight overpowers flashlight beams. Wrong answers like "Test 1: 1 flash at night" are incorrect because Test 1 is clearly marked SUCCESS, not FAILED. Students might choose this if they confuse which tests worked vs. failed, or if they think the first test often fails. Help students analyze test results by highlighting status words: SUCCESS vs. FAILED. Create a chart with two columns: "Tests that Worked" and "Tests that Failed." Emphasize: read carefully - the question asks for the test that did NOT work. Practice identifying key words that show failure: FAILED, did not work, could not see/hear. Watch for: students who pick the first or last test without reading results, or who confuse SUCCESS with FAILED.
Read about Carlos's design. What problem did his design solve?
Explanation: This question tests understanding of designing biomimicry solutions (1-LS1-1: Use materials to design a solution to a human problem by mimicking how plants and/or animals use their external parts to help them survive, grow, and meet their needs - designing solution that mimics nature part). Biomimicry design means copying nature's solutions to solve human problems. Process: (1) Identify human problem, (2) Find animal/plant with similar need and observe how external part solves it, (3) Figure out the MECHANISM (how it works), (4) Design human solution copying that mechanism with available materials, (5) Build and test. The key is copying HOW it works (mechanism), not just what it looks like. Carlos's problem was retrieving a ball stuck behind a washer. Carlos looked at elephants which have trunks that can reach far and grab things. The design uses a ruler, tape, string, and binder clip to make a reaching tool. The design mimics elephant trunk by having a long reach with a grabbing end. This copies the reaching and grasping mechanism that makes elephant trunks useful. The correct answer says "Design copies elephant trunk reach using a ruler, tape, string, and binder clip to grab a ball stuck behind a washer" which accurately describes both the problem solved and the mechanism copied. The answer shows understanding that the design copies the long reach and grasping ability from elephant trunks using simple materials to solve Carlos's problem of retrieving something out of reach. The mimicry is functional (copies how it works) not just visual (copies how it looks). Wrong answers like "Design copies elephant ears using paper fans to cool a room, so Carlos stays cool on a hot day" are wrong because they solve a different problem - the question asks about the ball retrieval problem, not cooling. Students might choose this if they don't read carefully to identify the actual problem being solved. Help students design by following steps: (1) Problem: "I need to..." (2) Nature: "What animal/plant solves similar problem?" (3) Mechanism: "HOW does the part work?" (be specific - "long flexible part reaches and grabs"), (4) Materials: "What can I use to copy that?" (5) Design: Make it! Watch for: students who cannot articulate specific mechanism being copied, or who think they need to use same materials as nature.
Look at these animals. Which behavior pattern appears in many animals?
Explanation: This question tests understanding of behavior patterns that help offspring survive (1-LS1-2: Read texts and use media to determine patterns in behavior of parents and offspring that help offspring survive - identifying patterns part). A pattern repeats across different animals, and the warmth pattern involves parents providing body heat while babies stay close to maintain safe temperatures. The warmth pattern appears in penguins (parents huddle over chicks who nestle underneath), mammals (mothers cuddle babies who snuggle close), and even some snakes (mothers coil around eggs/babies who cluster together). Option A correctly identifies "parents keep warm + babies stay close → helps survival by keeping babies at a safe temperature" - this accurately describes how the warmth pattern prevents hypothermia and maintains proper body function. Options B, C, and D describe impossible scenarios about painting, flying through clouds, or finding treasure - these fantasy behaviors don't represent real animal patterns or survival needs. To teach this, use temperature examples: "What happens if you get too cold? You can't move well! Baby animals are small and lose heat fast." Show pictures: penguin chick under parent's warm pouch, puppies piled together with mother, baby birds huddled under parent's wings. Create a warmth chart showing Parent Action | Baby Action | Why It Helps, emphasizing that staying warm = staying alive.
Read Chen’s tomato account. Are offspring exactly like or only similar?
Chen saves seeds from one big tomato from his parent tomato plant. He grows four plants.
Similarities (evidence): Evidence 1: Parent is a tomato plant. All four offspring are tomato plants. Evidence 2: Parent has compound leaves (many leaflets). All four offspring have compound leaves. Evidence 3: Parent produces tomatoes. All four offspring produce tomatoes. Evidence 4: Parent needs sun, water, and warm weather. All four offspring need the same. Evidence 5: Parent is a vine and needs support. All four offspring are vines and need staking.
Differences (evidence): Evidence 1: Tomato size varies: parent 3 in; plants 2.5, 3.5, 3.0, 2.8 in. Evidence 2: Tomato number varies: parent 40; plants 35, 50, 38, 42. Evidence 3: Plant height varies: parent 5 ft; plants 4, 6, 5, 4.5 ft. Evidence 4: Ripening time varies: parent day 75; plants day 70, 80, 75, 73.
Combined analysis: Offspring inherit tomato traits but vary in details. Conclusion: Offspring are like but not exactly like the parent.
Explanation: This question assesses the skill 1-LS3-1, where students make observations to construct an evidence-based account that young plants and animals are like, but not exactly like, their parents, focusing on creating that evidence-based account. Evidence-based account means telling what we observed using facts and proof, not opinions; for offspring and parents, evidence always shows the same pattern: offspring are like parents because they inherit key species traits such as body structure, basic features, and behaviors, but not exactly like parents due to variations in colors, sizes, patterns, and specific details. This pattern exists because offspring inherit genes from parents which makes them similar, but each offspring gets a unique combination of genes plus small random changes that add more variation, resulting in all organisms of the same species being similar yet every individual unique, and this is true for all living things including plants, animals, and humans. Chen's account of tomato plants included evidence of similarities: all four offspring are tomato plants like the parent; they have compound leaves like the parent; they produce tomatoes like the parent; they need sun, water, and warm weather like the parent; and they are vines needing support like the parent. These prove offspring inherited from the parent; the account also included evidence of differences: tomato size varies like 2.5-3.5 inches versus 3; tomato number varies like 35-50 versus 40; plant height varies like 4-6 feet versus 5; ripening time varies like day 70-80 versus 75. Together, the evidence shows the pattern that offspring are like the parent in major traits like body structure and species features but not exactly like in variable traits like color, size, and specific patterns. The correct answer says 'Evidence shows offspring are only similar: all are tomato vines with tomatoes BUT sizes, plant heights, and ripening days vary—like but not exactly like' which correctly synthesizes both similarity and difference evidence into the 'like but not exactly like' pattern with specific examples from both categories, showing understanding that evidence proves two things simultaneously: inheritance making offspring like parents in key ways, and variation making each unique, which is the fundamental pattern of heredity. A distractor like 'Evidence shows offspring are exactly like the parent because they are tomato plants with vine stems, so their tomato sizes, numbers, and ripening days match too' is wrong because it only mentions similarities ignoring differences, misses the synthesis pattern, and exaggerates to identical when evidence shows variation; students might choose this if they can see similarities but not both simultaneously, think 'like' means 'identical,' or focus on one type of evidence ignoring the other. To help students understand 'like but not exactly like,' use a Venn diagram with similarities in one circle like body structure and species traits, differences in the other like colors and sizes, and the overlap showing the pattern of like in important ways but unique in details. Use concrete comparisons such as 'You have two eyes, nose, mouth like your parents (similar) but maybe different eye color, height, hair texture (different)—like but not exactly!' Practice sorting observations into which show similarity and which show difference, then connect that both are true at the same time, emphasizing inheritance makes similar while unique combinations make different, and show this pattern across examples like puppies, plants, and birds to celebrate how nature keeps species recognizable yet each individual special, watching for students who think it must be either similar or different, not both.
Look at Jamal’s duck chart. What varies among ducklings?
Explanation: This question tests the skill of making observations to construct an evidence-based account that young plants and animals are like, but not exactly like, their parents (1-LS3-1) - specifically recording differences in offspring. Offspring (baby animals) are similar to their parents but NOT EXACTLY the same - this is called variation. Even ducklings from the same mother duck show differences in their features because each duckling inherits a unique mix of genes from both parents, and this random mixing creates unique combinations in each baby. Jamal observed a mother duck and her ducklings, and his chart recorded multiple features including feather shade, foot color, and peep volume. The results show variations: some ducklings have lighter feathers while others have darker feathers, some have orange feet while others have darker feet, and their peep sounds vary in volume - proving each duckling is unique! The correct answer says "Observations show ducklings differ in feather shade, foot color, and peep volume; they are not identical to each other" which accurately identifies the multiple variations Jamal recorded, showing that ducklings are like their mother but not exactly like her or each other. Answer B "all ducklings are exactly like the mother duck" is wrong because it claims perfect identity when Jamal's chart clearly shows differences in multiple features - students might choose this if they expect offspring to be identical copies of parents and don't understand natural variation. To teach this concept, have students observe real baby animals side-by-side: "Look at these 5 ducklings - what's different? Some have lighter feathers, some darker! Different foot colors too!" Use comparison charts with columns for each duckling to track variations systematically, and emphasize that these differences are normal and good - they help species survive because if all ducklings were identical, one problem could affect them all the same way.
Maya says there is no place to store math tools in class. She draws a rack with 3 shelves, like three long flat lines stacked, and labels “shelves.” How does the shelf shape help solve the problem?
Explanation: This question tests the 1st grade skill of developing a simple sketch to show a solution to a problem, focusing on how the object's shape helps it function (K-2-ETS1-2: Develop a simple sketch to illustrate how the shape of an object helps it function as needed to solve a given problem). When designing solutions to problems, we sketch or draw our ideas to show what we're thinking. An important part of any design sketch is showing the shape of the solution and how that shape helps solve the problem. Different shapes do different jobs: flat shapes provide surfaces to place or stand on; shapes with edges or walls hold things in and prevent spilling or falling; shapes with dividers separate items into sections; round shapes roll or don't have corners; narrow shapes fit in tight spaces; wide shapes are stable. A good sketch shows the shape features that are important for making the solution work. In this scenario, Maya says there is no place to store math tools in class. She draws a rack with 3 shelves, like three long flat lines stacked, and labels “shelves.” The key shape features shown are flat surfaces stacked to create levels. Choice A is correct because it accurately identifies the shape: describes the shape shown in sketch; correctly connects shape to function: explains how shape feature solves problem; identifies key functional feature: focuses on the shape element that makes solution work. For example, the shelves make levels to hold items in different spots. Choice C represents decorative focus: focuses on non-functional aspects like pretty colors, not for holding things. This error typically occurs when students notice shape but don't connect it to function, focus on non-functional aspects of drawing, miss the key shape feature that solves problem, confuse what shape does, describe general shape without explaining how it helps, think any shape description is sufficient. To help students understand sketching solutions: Practice 'shape does job' connections (flat top - stand on it, edges - hold things in, dividers - separate items, holes - hold specific things, wide base - stable); have students sketch simple solutions and explain 'how does this shape help?'; look at real objects and identify functional shape features; emphasize that sketch should show the shape features that make it work, not just be pretty. Watch for: students who draw but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape without connecting to problem-solving, who miss the key functional feature in their description, or who think any shape will work without thinking about what shapes do. Key concept: the SHAPE of an object determines what it can do - we sketch to show and communicate what shape we need to solve the problem.
Chen records daylight. Summer is 15 hours, Fall is 12 hours. Which has more daylight?
Explanation: This question tests the 1st grade skill of comparing the amount of daylight across different seasons using observations (1-ESS1-2: Make observations at different times of year to relate the amount of daylight to the time of year). To compare daylight across seasons, we look at measurements or observations from different times of year and determine which season has more or less daylight. Daylight hours are longest in summer (most hours when sun is up), shortest in winter (fewest hours when sun is up), and in-between during spring and fall. We can compare using specific measurements (like 15 hours in summer vs 9 hours in winter) or observations (like it stays light until 8pm in summer but gets dark by 5pm in winter). In this record, Chen notes summer with 15 hours and fall with 12 hours. The data clearly shows summer has more daylight than fall. Choice B is correct because it accurately states summer has more daylight than fall, which matches the evidence from the records showing 15 hours in summer vs 12 hours in fall. Choice A represents a reversed comparison error, stating fall has more daylight than summer. This error typically occurs when students reverse comparative terms (more/less, most/least), misread the numbers, or confuse the seasons. To help students compare daylight across seasons: Use clear visual comparisons (bar graphs showing daylight hours by season, side-by-side pictures of same time in different seasons); practice comparative language (more than, less than, most, least); explicitly connect season names to their data; have students find the largest and smallest numbers in table; discuss personal experiences comparing seasons. Watch for: students who confuse season names, reverse comparative terms, focus on one season without comparing to others, misread data tables, or base answers on temperature instead of daylight. Emphasize: look at all the data, find which season has the biggest/smallest number, that tells you which has most/least daylight.
Read about Chen’s sunflowers. What varies among the offspring?
Explanation: This question tests the skill of recording differences in offspring (1st grade science standard 1-LS3-1: Make observations to construct an evidence-based account that young plants and animals are like, but not exactly like, their parents). Sunflower offspring show variation because each seed inherits a unique combination of genetic information, even from the same parent plant. Chen's observations of sunflower offspring reveal variations in height (some grow tall, others stay shorter), petal color or pattern (pure yellow, yellow with brown centers, orange-tinted), and flowers per stem (single flowers or multiple blooms) - for example, one plant might grow 5 feet tall with one large yellow flower while another reaches 3 feet with multiple smaller flowers that have orange-tinted petals. The correct answer B states 'Observations show sunflower offspring vary in height, petal color or pattern, and flowers per stem; young are not exactly alike' which accurately identifies the multiple variations observed and demonstrates understanding that plant offspring are diverse. Answer A is wrong because it claims 'all sunflower offspring match the parent' and are 'identical' when observations show clear differences - students might choose this if they don't realize plants can vary like animals do. To teach this concept, grow sunflowers from seeds of the same flower: 'Let's measure how tall each sunflower grows - are they all the same? Look at the petals - do they all look exactly alike?' Use charts to track multiple features and explain that just like a litter of puppies looks different, seeds from the same sunflower grow into unique plants!
Problem: Books slid off when Maya carried them to the rug. At the building station, Maya and Chen built a tray model from a shallow box. Materials: shallow box, cardboard strips, tape. Shape features: they added raised edges on all four sides. They tested it by putting books on the tray and walking. The books stayed on the tray and did not slide off. The edges acted like walls to keep items in. The model showed the shape helps the tray work. How did the edges help when they tested it?
Explanation: This question tests the 1st grade skill of developing a simple physical model to show how the shape of an object helps it function as needed to solve a problem (K-2-ETS1-2: Develop a physical model to illustrate how the shape of an object helps it function). A physical model is something we actually build (not just draw) to test our design ideas. Building a model lets us see if the shape we planned actually works to solve the problem. When we build and test a model, we can observe how the shape features function: we can see dividers actually separating items, feel a flat surface providing stable support, watch edges preventing things from falling, observe openings holding specific objects. Testing the model gives evidence about whether the shape helps it work as needed. The shape of an object determines what it can do - round shapes roll, flat shapes provide surfaces, edges create barriers, dividers create sections. In this scenario, books slid off when Maya carried them to the rug, so Maya and Chen built a tray with raised edges to keep them in place. They built the model using a shallow box, cardboard strips, and tape and shaped it to have raised edges on all four sides. When they tested it, they put books on the tray and walked, and the books stayed on without sliding off. Choice B is correct because it accurately identifies the shape feature of raised edges and correctly connects to the observed function of keeping books from falling off, including evidence from the demonstration where the edges acted like walls during walking. For example, the raised edges formed barriers and when books were carried on the tray around the classroom the edges prevented them from sliding off. Choice A represents wrong function attributed. This error typically occurs when students notice materials but not shape, describe process instead of function, focus on non-functional aspects, describe shape generally without connecting to how it works, don't connect model testing results to shape's role, think decorative and functional features are equally important, confuse what different shapes do. To help students understand physical models and shape-function: Build and test simple models, explicitly discuss 'what shape feature?' and 'how does that shape help it work?'; demonstrate how changing shape changes function (tray without edges vs. with edges); emphasize testing shows whether shape works (evidence-based); connect model features to testing results; use concrete language about shapes and their jobs. Watch for: students who describe materials instead of shape, who build but can't explain how shape helps, who focus on decorative elements instead of functional shape, who describe shape but don't connect to problem-solving, who ignore evidence from testing, or who think building skill matters more than functional design. Key concepts: (1) physical model = actually built to test, (2) shape features have functions (dividers separate, edges contain, flat tops support, etc.), (3) testing shows if shape works, (4) evidence from testing tells us if shape solves problem.
Sofia watched her shadow safely, not the sun. Morning: long. Lunch: short. Afternoon: long. How does the sun’s position change?
Explanation: This question tests the 1st grade skill of describing the sun's apparent movement across the sky during the day (1-ESS1-1: Use observations of the sun to describe patterns that can be predicted). The sun appears to move across the sky during the day: it appears low in the sky in the morning (near the horizon), rises to be high in the sky at noon or midday, and appears low again in the evening. This pattern happens every day and can be observed through shadows, the sun's position relative to landmarks, or by safely observing at different times. In this observation, Sofia watched her shadow change from long in the morning, to short at lunch, to long in the afternoon - this evidence shows the sun's position changing from low in the morning to high at midday to low again in the afternoon. Choice A is correct because it accurately describes the pattern shown: the sun appears low, then high, then low, which matches the shadow observations of long-short-long that Sofia recorded. Choice B shows the reversed pattern error, claiming the sun goes high-low-high, which typically occurs when students confuse the shadow pattern with the sun's position or mix up cause and effect. To help students understand: Have them observe shadows at morning, noon, and afternoon on same sunny day; use a lamp and globe to show how position change creates shadows; draw pictures of sun's position at different times; keep a daily 'sun diary' marking sun's position. Watch for: students who think sun only moves because they move, who confuse moon and sun, who don't recognize this as predictable daily pattern, or who think sun's position depends on weather or activities.
Read about Sofia. In the dark, she could not see her toy car. When her flashlight shined, she could see it. What did Sofia need to see the car?
Explanation: This question aligns with the skill 1-PS4-2: Make observations to construct an evidence-based account that objects can be seen only when illuminated - understanding light necessary for visibility. We can only see objects when there is light; light shines on objects and bounces into our eyes, which lets us see. In the dark with no light, objects are still there but we cannot see them because no light is bouncing off them into our eyes; when we turn on a light or open curtains, light hits the objects and we can see them. In this story, Sofia was in a dark room and could not see her toy car; when her flashlight shined, she could see it; the toy car didn't move or change - the lighting changed. The correct answer says "A bright flashlight to shine light on it" which correctly identifies that Sofia needed light to see the car; light makes objects visible, and this is the key concept: illumination is necessary for vision. A distractor like "The car disappeared and was not there anymore" is wrong because it claims the object was absent when really the lack of light made it invisible; students might choose this if they think objects disappear in the dark instead of becoming invisible or don't understand light's role in vision. For teaching, do demonstrations: show an object in light, turn off lights safely, discuss how it's still there but invisible, then turn lights back on; use a flashlight in a dim room to 'reveal' objects and ask, 'Is the object gone or just invisible?' (just invisible) and 'What do we need to see things?' (light). Explain that light bounces off objects into our eyes - no light means we can't see; connect to everyday life like needing lights at night or a flashlight in dark closets, and watch for students who think objects vanish in the dark.
A rabbit has long ears. How do ears help it stay safe?
Explanation: This question tests understanding of 1-LS1-1: Use materials to design a solution to a human problem by mimicking how plants and/or animals use their external parts to help them survive, grow, and meet their needs - understanding how external parts help organisms. External parts are body parts on the OUTSIDE that we can see - like beaks, feet, ears, trunks, spines, gills. All living things have basic needs: food, water, air, protection from danger, and ability to move. External parts help organisms meet these needs. For example: beaks help birds get food, gills help fish breathe underwater, sharp spines protect cactus from being eaten. Rabbits have long, upright ears that can turn in different directions. Rabbit's need is to stay safe from predators like foxes, hawks, and coyotes. The ears help meet this need by catching sounds from far away and pinpointing where danger is coming from - they work like satellite dishes collecting sound waves. For example, when a fox steps on a twig 50 feet away, the rabbit's ears turn toward the sound and alert it to run to safety. This helps rabbits survive because early warning gives them time to escape predators. The correct answer says "Ears help rabbit hear danger by turning to sounds far away, so it can run and survive" which accurately explains the need (safety) and mechanism (detecting distant sounds). The answer identifies that rabbit's ears help it stay safe through enhanced hearing, which meets its need for protection from predators. This shows understanding that external parts have specific functions that help prey animals detect and avoid danger. Wrong answers like "dig holes by scooping dirt" are incorrect because ears are for hearing, not digging - rabbits use their strong paws to dig. Students might choose this if they focus on the ear's shape rather than function, or confuse different body parts' jobs, thinking any body part can do any task. Help students connect parts-needs-survival using three questions: (1) What does rabbit need? (safety from predators), (2) What part helps? (long ears), (3) HOW does it help? (hear danger coming). Use concrete examples with actions: cup hands behind ears to show how bigger ears catch more sound. Compare to tools: "Rabbit ears are like radar dishes - they turn to catch sounds from all directions." Emphasize different senses for safety: ears for hearing, eyes for seeing, nose for smelling danger. Show pictures of rabbits with ears turned different directions. Act out: "Close your eyes and turn your head when you hear a sound - that's what rabbit ears do!" Watch for: students who think body parts can do any job, or who focus on appearance rather than function.
A woodpecker has a long, strong beak. How does its beak help it get food?
Explanation: This question aligns with the skill 1-LS1-1, which involves understanding how plants and animals use their external parts to survive, grow, and meet their needs. External parts are the body parts on the outside that we can see, like beaks on woodpeckers, trunks on elephants, or spines on cacti. All living things have basic needs such as food, water, air, protection from danger, and the ability to move. External parts help organisms meet these needs; for example, a woodpecker's beak helps it get food by drilling into wood, an elephant's trunk helps it reach water, and spines protect cacti from animals. A woodpecker has a long, strong beak; its need is to get food, and the beak helps by pecking holes in tree bark, for example, to reach insects hiding inside, which helps it survive by obtaining nutrition to grow and stay healthy. The correct answer says 'Beak helps woodpecker peck holes in bark, which lets it reach insects for food' which accurately explains the need for food and how the beak works as a tool for accessing it. A distractor like 'Beak helps woodpecker swim by pushing water, which helps it catch fish to eat' is wrong because it confuses the woodpecker's beak with a duck's and attributes functions to the wrong animal; students might choose this if they think all beaks do the same thing or focus on water without considering the bird's habitat. To teach this, help students connect parts to needs by asking: What does the woodpecker need? (food), What part helps? (strong beak), How does it help? (by pecking like a hammer). Compare beaks to tools, like a hammer for woodpeckers versus a scoop for ducks, and act out pecking motions with safe objects.
Read about Marcus. A truck passed; the window shook. Why?
Explanation: This question tests understanding of 1-PS4-1: Plan and conduct investigations to provide evidence that vibrating materials can make sound and that sound can make materials vibrate - specifically the sound makes materials vibrate part. Sound is vibrations traveling through air. When sound reaches other objects, the vibrations can make those objects vibrate too. We can SEE and FEEL this when materials like windows shake because of loud sounds. In this story, a truck passed by Marcus. This made a loud truck sound. The sound vibrations traveled to the window glass and made it vibrate. This shows sound can make materials vibrate. The correct answer says "The truck sound made the window glass vibrate" which identifies sound as the cause of the window's vibration. This is correct - the truck sound made the window shake. Sound vibrations transfer to nearby materials. Answer C "The window shook first and made the truck sound" is wrong because it reverses cause-effect. Students might choose this if they don't understand that the truck makes sound which then affects the window. Do demonstrations students can see: have students gently touch a window when a loud vehicle passes. Ask "What made the window shake?" Connect loud sounds to window movement. Explain that very loud sounds like trucks make strong vibrations that can shake even heavy things like windows.
Sofia saw the sun set at 8 pm in June and 5 pm in December. Based on the observations, why is there less daylight in December?
Explanation: This question tests the 1st grade skill of explaining how the time of year relates to the amount of daylight using evidence from observations (1-ESS1-2: Make observations at different times of year to relate the amount of daylight to the time of year). The time of year (what season or month it is) directly affects how much daylight we have. During summer months (June, July, August), there are many hours of daylight - the sun is up for a long time each day. During winter months (December, January, February), there are fewer hours of daylight - the sun is up for less time. Spring and fall have in-between amounts. This pattern repeats every year, making it predictable: if we know what time of year it is, we can predict approximately how much daylight there will be. In this observation record, the evidence shows Sofia's notes on sunset times with June at 8 pm and December at 5 pm, showing summer months with later sunsets and more hours than winter months. This evidence clearly demonstrates as time of year changes, daylight amount changes; summer times have more daylight than winter times; when it's June sunset is late but in December it's early. Choice A is correct because it accurately explains relationship, states time of year affects daylight amount with winter having fewer hours, connects observations to time-of-year cause, uses evidence to show relationship. This matches the evidence that observations show December with less daylight due to earlier sunset compared to June. Choice B represents wrong cause attribution, saying because December is colder the sun goes away sooner, focusing on temperature instead of time. This error typically occurs when students confuse correlation with causation, attribute changes to weather or temperature instead of time of year. To help students understand time-of-year and daylight relationship: Create clear 'if-then' statements ('If it's summer, then we have many daylight hours. If it's winter, then we have fewer hours'); track daylight across multiple months showing how amount changes as time of year changes; explicitly label time markers (months, seasons) with corresponding daylight data; practice cause-effect language ('because it's winter, we have less daylight'); make predictions ('It's June now, so we should have about 15 hours of daylight'). Watch for: students who see facts but don't connect them (know summer has more daylight but don't link it to time of year), who reverse cause-effect (think daylight amount determines season rather than season determining daylight), who attribute changes to weather or temperature instead of time of year, or who think pattern is random rather than tied to predictable yearly cycle. Key concept: time of year (when in the year it is) determines/affects/relates to amount of daylight we have.
Keisha saw: mirror→reflected; clear plastic→bright through; wax paper→dim through; black cloth→no light. Which materials have similar effects on light?
Explanation: This question assesses the skill 1-PS4-3: Plan and conduct an investigation to determine the effect of placing objects made with different materials in the path of a beam of light - observing and recording results part. Different materials affect light in different ways. Transparent materials (like clear plastic, glass) let all light pass through - we can see through them and light shines through brightly. Translucent materials (like wax paper, tissue) let some light pass through - light is dim, shadows are light gray. Opaque materials (like cardboard, wood, thick cloth) block light completely - no light passes through, shadows are dark. Some shiny materials (mirror, foil) also reflect light back. Keisha tested 4 materials. Results showed: mirror reflected light (reflected), clear plastic let all light through (bright through), wax paper let some light through (dim through), black cloth blocked all light (no light). The pattern is clear: material type determines effect on light. 2 materials let light through, 1 blocked light, 1 reflected. The correct answer says 'Mirror and black cloth both stopped light from going through' which accurately describes the correct classification of materials. This shows understanding that materials have different properties: some are transparent (light passes through), some translucent (some light passes), some opaque (light blocked). The data clearly shows these different effects. An error type like 'Clear plastic and wax paper both blocked all light' is wrong because it misclassifies which materials blocked vs allowed light. Students might choose this if they don't recognize pattern across multiple observations, focus on single material not overall results, confuse material properties with light transmission, expect all materials to behave the same way, don't understand categories like transparent vs opaque. Help students analyze data by asking: 'Which materials let light through? Which blocked light? Are there groups with similar results?' Create visual sorting: picture cards of materials, sort into 'light passes' 'some light' 'light blocked' piles. Explain categories: Transparent = see through clearly, light passes. Translucent = see shapes/light but blurry, some light passes. Opaque = cannot see through, blocks light. Demonstrate: 'Can you see my hand through clear plastic? Yes - transparent. Through wax paper? A little - translucent. Through cardboard? No - opaque.' Connect to everyday: windows (transparent glass), shower curtain (translucent), walls (opaque). Watch for: students who don't recognize materials can be grouped by similar light effects, or who attribute light passing to unrelated properties like color, weight, or texture instead of transparency.
Read how Chen improved his drum code. Original: 3 fast taps meant “stop.” Test showed one worker near a loud saw could not hear the drum because the saw was too loud. Chen added a tall pole with a red flag and waved it with 3 taps. New test: all workers saw the red flag and stopped. What did Chen learn from testing that led to improvement?
Explanation: This question assesses the skill 1-PS4-4: Use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance - improving device based on test results. Improving or iterating means making something better after testing shows problems, as part of the engineering design process where you design, build, test, improve, and test again to ensure it works well. Testing reveals what works and what doesn't, allowing us to use those results to decide on targeted changes that solve specific issues, and then test again to verify the improvement. Chen's original device was a drum code with 3 fast taps meaning 'stop.' Testing showed a problem: one worker near a loud saw could not hear the drum because the saw was too loud. Chen improved the device by adding a tall pole with a red flag and waving it with 3 taps. The correct answer says 'Test showed workers could not hear near machines, so Chen added a red flag they could see' which accurately identifies the problem that testing revealed and the improvement made, showing understanding of iteration: test results (showed audibility issue) → analyze (understand why) → improve (make changes that address cause) → test again (verify it worked). A distractor like 'Test showed the code was perfect, so Chen changed nothing and stopped testing' is wrong because it claims no problem when testing showed one, and students might choose this if they do not understand how test results drive improvements. Help students understand iteration using the cycle: Test (find problem) → Think (why problem happened?) → Improve (change something to fix cause) → Test Again (did it work?). Use concrete before-after comparisons: 'Before: could not hear drum near saw. After: added flag. Now: can see signal!' Emphasize targeted improvements: identify specific problem from test, understand cause, change the specific thing causing problem (not random changes).
In the classroom, Chen and Maya notice markers roll off the table. They watch for 5 minutes during writing time. They count 7 markers that roll onto the floor. Two markers get stepped on and the tips bend. Mr. Ruiz asks them to state a clear problem. They say the table is smooth and markers do not stay put. A new tool or object could help stop the rolling. Which statement best defines the problem?
Explanation: This question tests the 1st grade skill of defining a simple problem that could be solved with a new or improved object or tool, based on observations and information gathered (K-2-ETS1-1: Define a simple problem that can be solved through the development of a new or improved object or tool). Defining a problem means stating clearly and specifically what is wrong or difficult, based on information we've gathered. A good problem definition is: (1) Clear and specific (says exactly what's difficult), (2) Based on observations and information (not just guessing), (3) Simple (one main problem, not many at once), (4) Solvable (especially with a tool or object we could create or improve). Problem definition is different from observing (observing = noticing what happens; defining = stating the problem based on observations) and different from solving (defining = what's wrong; solving = fixing it). We define problems AFTER gathering information and BEFORE creating solutions. In this scenario, students observed markers rolling off the table during writing time, counted 7 markers that rolled onto the floor, and noted two markers got stepped on with bent tips. Based on this information, they defined the problem as: the table is smooth and markers do not stay put. This problem definition is clear, specific, based on information, and solvable with a tool. Choice A is correct because it clearly defines the specific problem: states exactly what's difficult; is based on information gathered: connects to observations made; identifies solvable problem: could be addressed with new/improved tool or object; is appropriately simple: one clear problem, not too complex. This matches the observations they made showing this specific difficulty. Choice B represents too vague, just observation without problem definition, jumping to solution, not tool-solvable problem, too broad, wrong problem, irrelevant to information, dismissing value of defining, confusing cause with problem, including solution in definition. This error typically occurs when students describe what they see without identifying it as a problem, want to jump to 'fixing it' without defining clearly, state problems too generally without specifics, confuse observations with problem statements, think any difficulty is equally valid problem even if not supported by information, don't distinguish between problems solvable with tools vs. other problems. To help students define problems: Practice 'The problem is...' statements; contrast vague ('messy') with specific ('supplies mixed up, no containers'); show how information leads to problem definition (gathered data shows X, so problem is Y); identify problems solvable with tools/objects (can't reach = need step stool) vs. other problems (don't understand math = need teaching); use formula: [Who] can't/doesn't [what] because [specific reason]. Watch for: students who describe observations but don't define problem, who jump to solutions ('we need X') without defining problem first, who state problems too vaguely, who identify problems that tools couldn't help, or who think defining problems is same as solving them. Key sequence: 1) Gather information, 2) Look at information to see pattern or main difficulty, 3) State problem clearly and specifically, 4) Make sure it's solvable with tool/object, 5) Then create solutions.