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5th Grade Science

5th Grade Science Practice Test: Practice Test 5

Practice Test 5 for 5th Grade Science: real questions and explanations from the Varsity Tutors practice-test pool.

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Question 1 of 25

Based on the bar graph, what does it show about weight before and after mixing?

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Question 1

Based on the bar graph, what does it show about weight before and after mixing?

  1. The weight stayed the same before and after in each trial. (correct answer)
  2. The weight increased after mixing in each trial.
  3. The weight decreased after mixing in each trial.
  4. The weight changed in only one trial after mixing.

Explanation: This question tests the ability to use graphs to identify patterns showing that weight remains constant during changes (NGSS 5-PS1-2). Students must interpret visual data displays to recognize conservation of matter. Graphs are powerful tools for making patterns visible; in a bar graph, if the 'Before' bar and 'After' bar are the same height in each trial after mixing, the visual pattern is clear: weight stayed constant, providing evidence for conservation. Choice A is correct because it accurately identifies the visual pattern in the graph: the bars are equal height showing weight stayed the same before and after mixing in each trial. This demonstrates understanding that visual patterns in graphs provide evidence—when the graph shows equal values before and after across trials, matter is conserved. Choice B represents the misconception that weight increased after mixing in each trial; this error occurs because students may misread the scale, confuse different trials with before/after, or focus on one bar instead of comparing heights. To help students: Teach explicit graph-reading skills by pointing to bars and asking: 'How tall is the Before bar? How tall is the After bar? Are they the same?' Use colors consistently, practice with simple graphs, have students create their own from data—watch for confusion between trials and always ask: 'What pattern do you see comparing before to after in all trials?'

Question 2

Three white powders looked identical, so color didn't help. All three dissolved in water, so dissolving didn't help either. Only one powder fizzed when vinegar was added. Which property was most helpful for distinguishing the powders?​

  1. White color, because all three powders matched in color exactly
  2. Dissolving in water, because all three dissolved the same way in water
  3. Fizzing with vinegar, because only one powder reacted while others did not (correct answer)
  4. Being a powder, because all powders can be identified by their form alone

Explanation: This question tests understanding of how different properties help distinguish one material from another (NGSS 5-PS1-3). Students must recognize that properties which differ between materials are useful for identification, while shared properties are not. When trying to distinguish between similar materials, we need to find properties that are DIFFERENT, not properties that are the SAME. Properties that both materials share don't help tell them apart—if all powders are white, color doesn't distinguish them. But if one powder fizzes with vinegar and the others do not, fizzing DOES distinguish them because the property differs. The most useful distinguishing properties are: (1) Properties that clearly differ between the materials, (2) Properties that are distinctive or unusual (like chemical reaction—specific to materials), (3) Properties that can be measured or observed objectively. In the scenario, fizzing with vinegar distinguished the powders because only one reacted while others did not—this difference allowed identification. Choice C is correct because it provides proper causal reasoning: the property was useful for distinguishing because it differed between the materials / one material had this property and the other didn't / this was the only property that was different. This demonstrates understanding that distinguishing requires finding properties that differ, not properties that are shared, and that the difference in the property is what makes it useful. Choice A fails because it claims a shared property distinguishes the materials, it states a fact without explaining why that property helps distinguish, it identifies a property that was the same for both materials, or it uses circular reasoning without explaining the cause-effect relationship. To distinguish materials effectively, we must identify properties that are different between them and explain how that difference enables identification. To help students understand distinguishing properties: Create a two-column comparison. Column 1: 'Properties that are the SAME' (don't help distinguish). Column 2: 'Properties that are DIFFERENT' (DO help distinguish). Fill it in for the materials: Same: color (all white), dissolving (all dissolve)—these don't help. Different: fizzing with vinegar (one yes, others no)—this DOES help. Emphasize: To tell materials apart, find properties that DIFFER. Practice with questions: 'Would color help distinguish these materials? Why or why not? Are they the same or different colors?' Also teach: The more distinctive a property is (few materials have it), the more useful it is—magnetic is very useful because only certain materials are magnetic, while 'solid' isn't useful because most materials are solid. Watch for: Students who list shared properties as distinguishing, or who don't explain WHY a property helps (just that it does), or who think all properties are equally useful. Always ask: 'Is this property the SAME or DIFFERENT between these materials? If it's the same, can it help tell them apart?'

Question 3

Amir saw a puddle after rain; next day it was gone. When it disappeared from view, the particles...

  1. The particles still exist and moved into the air as gas. (correct answer)
  2. The particles were absorbed and no longer exist as separate particles.
  3. The particles decreased in number as some disappeared forever.
  4. The particles turned into energy, so no particles remain.

Explanation: This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When a puddle dries up, the water particles evaporate—they change from liquid to gas state and move into the air as invisible water vapor, but they continue to exist. Choice A is correct because it accurately states that the particles still exist and moved into the air as gas, showing understanding of conservation of matter. Choice C represents the misconception that some particles can disappear forever during evaporation, suggesting matter can be destroyed in everyday changes—this violates the fundamental principle that matter cannot be created or destroyed in physical changes. To help students: Use a water cycle diagram to show that water particles move between locations but never disappear. Have students complete: 'The water particles were in the puddle. Now they are in the air as water vapor.'

Question 4

Earth's oceans are salt water; which reservoir is mostly fresh water stored underground?

  1. Groundwater in aquifers (correct answer)
  2. Pacific Ocean water
  3. Clouds and rain
  4. Water pipes and faucets

Explanation: This question tests students' ability to identify major water reservoirs on Earth (NGSS 5-ESS2-2). Water reservoirs are natural places where water is stored on Earth, with oceans as 97% salt water, ice caps and glaciers as 2% frozen fresh, groundwater as 0.6% underground fresh, lakes 0.01% surface fresh, rivers 0.0001% flowing fresh, and small atmospheric portions; groundwater is a crucial fresh source contrasting salty oceans. Choice A is correct because it identifies groundwater in aquifers as mostly fresh water stored underground, distinguishing it from salty oceans. Choice B is incorrect because Pacific Ocean water is salt, not fresh; this error often happens when students assume all water is fresh or confuse ocean size with freshness. To help students, demonstrate with a layered model showing underground aquifers vs. surface oceans, using percentages like 97% salty vs. 0.6% fresh underground. Watch for conflating clouds or human pipes with natural reservoirs, or not grasping salt-fresh differences and relative amounts.

Question 5

Based on the observations, Student A says, "A new substance formed because the mixture changed from clear to green." The student mixed 50 mL of blue sports drink with 50 mL of yellow sports drink. The temperature stayed at 20°C, no bubbles formed, and the smell stayed the same. Is Student A's reasoning correct?

  1. Yes, because any color change is always evidence of a chemical change.
  2. No, because the green color can be explained by mixing two colors, with no other reaction signs. (correct answer)
  3. Yes, because the temperature stayed the same, which proves a reaction happened.
  4. No, because chemical changes only happen when a solid is mixed with a liquid.

Explanation: This question tests 5th graders' ability to use evidence to determine whether mixing substances resulted in a new substance forming (NGSS 5-PS1-4), specifically evaluating whether evidence supports new substance formation and distinguishing predictable color mixing from chemical change. To determine if a new substance formed (chemical change), students must analyze observations for key indicators: temperature change without external heat source, gas produced (bubbles, fizzing), unexpected color change, solid forming from liquids (precipitate), new smell, or inability to easily reverse. For this question, blue + yellow drinks making green with no other changes - predictable physical color mixing, not chemical change. Choice B is correct because it correctly recognizes that green color can be explained by simple color mixing (blue + yellow = green) without any other reaction signs, showing the student understands to look for multiple indicators and that predictable color mixing is physical. Choice A represents a common error where students think any color change is always evidence of chemical change, which typically happens because students may focus on most obvious change (color) without checking for additional evidence or considering whether the color change is predictable from mixing. To help students: Show that color change alone is weak evidence - demonstrate both physical color mixing (food coloring) and chemical color change (with bubbles/temperature), emphasizing the need for multiple indicators. Watch for: Students who conclude chemical change from color alone without checking temperature, gas, or smell, or who don't distinguish between predictable color mixing (physical) and unexpected color change with other indicators (chemical).

Question 6

Chen notes: The sun looks brightest in daytime; stars are tiny points at night. The sun is 93 million miles away, while Betelgeuse is about 430 trillion miles away. Based on these observations, why is the sun brightest?​

  1. The evidence shows the sun appears brighter because it is closer. (correct answer)
  2. The evidence shows the sun appears brighter because stars are farther.
  3. The evidence shows distant stars do not make their own light.
  4. The evidence shows the sun appears brighter because it is larger.

Explanation: This question tests students' ability to use evidence to support an argument about why the sun appears brighter than other stars due to relative distances from Earth (NGSS 5-ESS1-1). Apparent brightness - how bright a star looks from Earth - depends primarily on distance. The evidence shows the sun is about 93 million miles away, while other stars like Betelgeuse are trillions of miles distant. Even though some stars produce more light than the sun (are more luminous), they appear much dimmer because they are enormously farther away. This is a fundamental principle in astronomy: distance dramatically affects how bright objects appear to observers. Choice A is correct because it uses the distance evidence from the stimulus to explain the brightness comparison. It demonstrates understanding that students must connect observational data (sun appears brightest) with distance data (sun is closest) to form a scientific argument. This shows proper use of evidence to support a conclusion. Choice D represents the error of introducing irrelevant factors like size without evidence. This mistake occurs when students don't connect multiple pieces of evidence together, or when they make conclusions that contradict the provided data. Students must learn to base arguments on evidence rather than assumptions. To help students: Practice analyzing data tables and extracting relevant evidence. Use sentence frames like 'The data shows... therefore...' to connect evidence to conclusions. Emphasize that in science, we must support arguments with evidence, not just opinions. Create opportunities to compare actual vs. apparent brightness using everyday examples (flashlights at different distances). Watch for: students who state conclusions without referencing evidence, who cherry-pick only supporting data while ignoring contradictory evidence, or who confuse correlation with causation. Teach explicit evidence-based reasoning: identify evidence → explain what it means → connect to question → draw conclusion.

Question 7

Amir blows air into a limp balloon; it expands and feels firm. This observation is evidence that particles of matter...

  1. are created inside the balloon when someone blows into it
  2. do not exist in air, so the balloon fills with empty space
  3. move in and fill space even though we cannot see them (correct answer)
  4. become visible, which is why the balloon looks bigger

Explanation: This question tests the ability to use observable evidence to infer the existence of unseen particles (NGSS 5-PS1-1). Students must connect what they can see to what must be happening at the invisible particle level. Scientists cannot see individual particles of matter with the naked eye because particles are far too small. However, we can observe evidence of particles through phenomena like dissolving, evaporating, and spreading. When we see a balloon expanding with air, this provides evidence that air particles exist and fill the space inside. The observable effect (balloon firming) is evidence of the unobservable cause (particle presence). Choice C is correct because it accurately infers from the observation that particles move in and fill space even though we cannot see them. This demonstrates scientific reasoning—using observable evidence to make logical conclusions about what cannot be directly observed. Choice A represents the misconception that particles are created inside the balloon when someone blows into it. This error occurs because students struggle to understand that something can exist even when invisible, or they think changes in appearance mean particles are created or destroyed rather than just moving or spreading apart. To help students: Conduct hands-on observations (food coloring spreading in water, sugar dissolving, perfume scent traveling) and guide students to ask 'What must be happening that I cannot see?' Use sentence frames: 'Even though I cannot see the particles, I know they must be filling the space because I observe the balloon expanding.' Watch for: Students who describe only what they see without connecting to the particle level, or who think substances magically transform rather than particles spreading while remaining themselves. Always emphasize: particles are conserved—they don't appear or disappear, they just move or spread out.

Question 8

When you drop an apple from a tree, it moves toward Earth's surface. Which statement best connects the cause to the effect?

  1. The apple falls, so gravity must be created by the falling apple.
  2. The apple falls because Earth's gravity pulls it toward Earth's center. (correct answer)
  3. The apple falls because it is red and round, so it rolls downward.
  4. The apple falls because the wind always blows things toward the ground.

Explanation: This question tests 5th grader's ability to use evidence to explain why objects fall toward the ground (NGSS 5-PS2-1), specifically recognizing cause-effect relationship between gravity and falling. Objects fall toward the ground because Earth's gravity pulls them toward Earth's center. This question asks students to identify which statement best connects the cause (gravity) to the effect (falling motion). A proper causal explanation must identify gravity as the force that produces the falling motion, not just describe the motion or attribute it to object properties. For this question, students must select the statement that properly links Earth's gravitational pull as the cause to the apple's downward motion as the effect. Choice B is correct because it uses causal language to connect Earth's gravity (cause) to the apple's motion (effect), specifically stating that Earth's gravity pulls the apple toward Earth's center, causing it to fall. This shows the student understands the cause-effect relationship and can articulate how gravity produces falling motion. Choice A represents a common error where students reverse cause and effect, suggesting gravity is created by falling rather than gravity causing falling. This typically happens because students observe falling and gravity together, but haven't yet developed clear understanding of which causes which - they may think the motion creates the force rather than the force causing the motion. To help students: Use clear cause-effect language: "Gravity (cause) makes objects fall (effect), not the other way around." Draw cause-effect diagrams with arrows: Gravity → Pulling force → Object falls. Address the reversal explicitly: "Gravity exists whether objects fall or not - when they do fall, it's because gravity was already pulling." Watch for: Students who confuse correlation with causation, thinking falling and gravity just happen together, or students who attribute falling to object properties (color, shape) rather than the external force of gravity.

Question 9

Based on multiple properties, which liquid is most likely the yellow one? Data: Liquid A—clear, 50mL, 50g, no odor; Liquid B—clear yellow, 50mL, 60g, no odor; Liquid C—cloudy white, 50mL, 55g, slight odor.

  1. Liquid B, because it is clear yellow, 50mL, and has 60g mass. (correct answer)
  2. Liquid A, because it is clear yellow, 50mL, and has no odor.
  3. Liquid C, because it is clear yellow, 55g, and has slight odor.
  4. Liquid A, because it is cloudy white, 50mL, and has 50g mass.

Explanation: This question tests the ability to compare materials using multiple observable properties (NGSS 5-PS1-3). Students must identify similarities and differences across several properties to effectively distinguish and classify materials. Using multiple properties together provides much more information than a single property alone. For example, many materials might be gray in color, but only some that are gray are also magnetic, hard, and heavy—this combination of properties helps narrow down what the material is. When comparing materials, we look for: (1) Shared properties (similarities)—what do both/all materials have in common? (2) Distinguishing properties (differences)—what properties are different between the materials? The properties that differ are especially useful for telling materials apart. In the scenario, Liquid B is distinguished by being clear yellow, 50mL, and 60g. Choice A is correct because it accurately identifies the combination using multiple properties from the data: clear yellow, 50mL, and 60g mass. This demonstrates understanding that effective comparison uses several properties together, not just one, and that the answer must match the actual data provided. Choice B fails because it claims Liquid A is clear yellow, but the data shows Liquid A is clear (not yellow) and reverses the color property. Comparisons must be based on the actual observed properties in the stimulus and should use multiple properties to make meaningful distinctions. To help students compare materials using multiple properties: Create a comparison matrix or Venn diagram. For two materials, draw two overlapping circles—in the overlapping section, list shared properties (both 50mL, both no odor); in the separate sections, list differences (Liquid B yellow and 60g, Liquid A clear and 50g). For more materials, use a data table with materials in rows and properties in columns, then look down columns to find similarities (all 50mL) and across rows to see the unique combination for each material. Practice asking: 'What properties are the SAME for these materials?' and 'What properties are DIFFERENT?' Then: 'Which differences are most helpful for telling them apart?' Watch for: Students who focus on just one property (color alone isn't enough), or who claim properties that aren't in the data, or who confuse which material has which property. Emphasize: Use multiple properties together—the combination is more powerful than any single property for identification.

Question 10

A cheetah eats meat; what does its body use that food energy for?

  1. running fast, growing, and keeping a steady temperature (correct answer)
  2. creating new energy, running fast, and making more energy
  3. only for growth, not for movement or warmth
  4. sharing energy with plants, growing, and staying warm

Explanation: This question tests understanding of how animals use energy from food for growth, movement, and warmth (NGSS 5-PS3-1). Students must recognize that all animal activities require energy that comes from the food they eat. When a cheetah eats meat, it uses that food energy for three main purposes: (1) Running fast - cheetahs can reach 70 mph, requiring enormous energy for their powerful muscles, plus energy for breathing, heartbeat, and all other movements; (2) Growing new cells, building muscle, replacing worn tissues, and healing any injuries from hunting; (3) Keeping a steady temperature around 38°C regardless of whether it's hot midday or cool at night. Choice A is correct because it identifies running fast (movement), growing (growth), and keeping a steady temperature (temperature regulation) as key uses of food energy. Choice B fails because it claims cheetahs can create new energy, when animals can only transform energy from food, not create energy from nothing - this violates the law of conservation of energy. To help students understand: Use the cheetah as an example of high energy needs - 'The world's fastest land animal needs lots of energy from meat to power its incredible speed, grow strong muscles, and maintain body temperature in the African savanna.' Emphasize that energy is transformed, not created: meat energy → cheetah's movement, growth, and warmth.

Question 11

How does a citywide composting program protect land resources using decomposition science?​

  1. They compost food scraps so decomposers turn waste into useful soil (correct answer)
  2. They dump food scraps into rivers to feed fish
  3. One student composts at home, but there is no community program
  4. They freeze trash forever so it never changes into anything

Explanation: This question tests students' ability to identify ways communities use science ideas to protect Earth's resources and environment (NGSS 5-ESS3-1). Communities implement various science-based programs to protect natural resources. Composting programs apply decomposition science: microorganisms like bacteria and fungi break down organic matter into nutrient-rich humus. This process recycles nutrients back into soil rather than sending them to landfills where they produce methane. Citywide programs provide bins, collection, and processing facilities that turn food waste into valuable soil amendment, reducing landfill volume and improving soil health. Choice A is correct because it describes how composting uses decomposers to turn waste into useful soil, demonstrating understanding of the biological process and its benefit to land resources. This shows how communities can organize waste processing based on natural decomposition. Choice B is incorrect because dumping food scraps in rivers would pollute water and harm aquatic life - this confuses protection with pollution and shows misunderstanding of proper waste management. To help students: Set up a classroom compost bin to observe decomposition stages. Identify decomposers (worms, pill bugs, fungi) in compost samples. Compare landfill vs. compost outcomes for food waste. Visit a community composting facility. Test finished compost vs. regular soil for plant growth. Calculate methane reduction from diverting organics from landfills. Create a decomposition timeline for different materials. Watch for: students who think composting is just piling up garbage, who don't understand the role of decomposers, who confuse compost with mulch, or who think it takes too long to be practical. Emphasize that composting speeds up natural processes through controlled conditions.

Question 12

A class measured: melting 50g→50g, dissolving 110g→110g, freezing 200g→200g, mixing 80g→80g. Why?

  1. because matter stayed the same amount each time; particles only changed form or mixed (correct answer)
  2. because the changes looked small, so the scale did not notice any difference
  3. because some matter was lost each time, but new matter was made to replace it
  4. because temperature changes always force the weight to return to the starting number

Explanation: This question tests the ability to use evidence from measurements to explain that matter is conserved during physical and chemical changes (NGSS 5-PS1-2). Students must provide causative reasoning, not just state the observation. The fundamental principle of conservation of matter is that matter cannot be created or destroyed during various physical changes like melting (50 g to 50 g), dissolving (110 g to 110 g), freezing (200 g to 200 g), and mixing (80 g to 80 g), where particles change form or arrangement but the total amount remains constant in each case. Choice A is correct because it provides a causative explanation: matter stayed the same amount each time, particles only changed form or mixed, showing consistent conservation across scenarios. Choice C represents incorrect reasoning: it claims matter was lost but replaced, which contradicts conservation by suggesting creation and destruction. To help students explain conservation, use sentence frames like 'The weights stayed the same because matter cannot be created or destroyed, so in each change, the particles were still all there, just rearranged or in a new form'; compare examples with 'Like melting 50 g ice to 50 g water—same for all.' Always ask 'Why do all these changes show the same pattern?' to generalize the principle.

Question 13

Students build a simple sundial and record hourly; which graph best represents shadow length changes?

  1. Line graph: time on x-axis, shadow length on y-axis (correct answer)
  2. Bar graph: shadow color on x-axis, time on y-axis
  3. Pie chart of shadow direction percentages only
  4. Line graph: month on x-axis, shadow length on y-axis

Explanation: This question tests students' ability to collect and represent data showing daily changes in shadow length and direction (NGSS 5-ESS1-2). Shadows change predictably throughout the day due to the sun's apparent movement across the sky. As Earth rotates, the sun appears to move from east (sunrise) to highest point at noon to west (sunset). This causes shadows to be longest in early morning (sun low in east), shortest at midday (sun highest), and longest again in late afternoon (sun low in west). Shadow direction also changes: morning shadows point west (away from eastern sun), and afternoon shadows point east (away from western sun). To show these patterns, data must include multiple measurements throughout a single day, recording both time of observation and shadow characteristics (length and/or direction). Choice A is correct because it includes the essential data: multiple time points throughout a single day (showing the full daily pattern) and shadow measurements (length and/or direction) that reveal the pattern. This data allows students to observe that shadows are shortest at midday and longer in morning/evening. The representation (table, graph, or organized observations) makes the pattern visible and supports analysis of daily shadow changes. Choice D fails because it graphs months instead of daily times, which is for seasonal patterns. This error is common when students don't understand that showing change requires multiple data points over time, or when they confuse daily patterns with seasonal patterns (which require months of data). Some students focus on irrelevant variables or don't recognize what measurements are needed to reveal the pattern. To help students: Conduct actual shadow investigations - have students trace or measure their own shadows or a fixed object's shadow at 3-5 times during the school day. Use a simple stick in playground as a shadow marker. Create data tables together, identifying what to record (time, shadow length, shadow direction). Graph the data and discuss the pattern. Connect to sun's movement: when is sun highest? Lowest? How does this affect shadows? Watch for: students who measure once and think they have 'data,' who record information but not systematically (different objects, inconsistent units, irregular times), or who don't understand that multiple measurements reveal patterns. Emphasize that scientists collect data systematically to reveal patterns that wouldn't be obvious from single observations.

Question 14

A student throws a ball straight up. After a moment, the ball slows down and comes back down. Why does it come back down?

  1. The ball comes down because the air pulls it downward more than gravity does.
  2. The ball comes down because gravity pulls it toward Earth the whole time. (correct answer)
  3. The ball comes down because gravity stops and starts depending on the throw.
  4. The ball comes down because gravity only pulls when the ball is falling.

Explanation: This question tests a 5th grader's ability to identify gravity as a force that pulls objects toward Earth (NGSS 5-PS2-1), specifically understanding that gravity acts constantly throughout an object's motion. Gravity is an invisible pulling force that Earth exerts on all objects, pulling them toward Earth's center (which we experience as 'down'). Unlike other forces students may know (like pushes or pulls from hands), gravity acts constantly, invisibly, at a distance, and on every object regardless of size, weight, material, or color. For this question, a student throws a ball straight up and it comes back down, demonstrating that gravity pulls it toward Earth throughout its entire path - while going up, at the top, and while coming down. Choice B is correct because it correctly explains that the ball comes down because gravity pulls it toward Earth the whole time, showing the student understands that gravity is always acting, not just when objects fall, and that it eventually overcomes the upward motion. Choice D represents a common error where students think gravity only pulls when the ball is falling - this typically happens because students may not yet understand that forces act constantly, thinking gravity 'turns on' only during downward motion. To help students: Emphasize that gravity pulls the ball down even as it rises (that's why it slows down going up) and use the analogy 'Gravity is like an invisible string always pulling the ball toward Earth - it never lets go!' Watch for: Students who think gravity stops and starts or only acts during falling motion.

Question 15

A coin is resting on your palm and does not fall. Gravity is still pulling on the coin. Why does the coin not fall while it is on your hand?

  1. It does not fall because your hand pushes up on it and supports it against gravity. (correct answer)
  2. It does not fall because gravity stops working when you hold something.
  3. It does not fall because the coin wants to stay where it is.
  4. It does not fall because air under the coin holds it up.

Explanation: This question tests a 5th grader's ability to use evidence to explain why objects fall toward the ground (NGSS 5-PS2-1), specifically understanding that gravity is always pulling even when objects don't fall. Objects fall toward the ground because Earth's gravity pulls them toward Earth's center, but when an equal opposing force (like support from your hand) acts upward, the object remains stationary. For this question, students must explain why gravity doesn't cause falling when an object is supported. Choice A is correct because it identifies that your hand pushes up on the coin, providing support that balances against gravity's downward pull, preventing falling even though gravity still acts. This shows the student understands that gravity is always pulling, and falling occurs only when no opposing force prevents it. Choice B represents a common error where students think gravity stops working when objects are held. This typically happens because students equate gravity with falling motion - when no falling occurs, they assume gravity isn't present, not understanding that balanced forces (hand pushing up equals gravity pulling down) result in no motion. To help students: Have students hold a heavy book and feel the downward push - 'That push you feel is the book's weight, which is gravity pulling it down. Your hand pushes up equally, so the book doesn't move.' Draw force arrows: upward arrow (hand's support) same size as downward arrow (gravity's pull) = no motion. Emphasize: 'Gravity ALWAYS pulls. When something doesn't fall, it's because something else pushes against gravity.' Watch for: Students who think gravity 'turns off' when objects are supported, not recognizing that gravity pulls constantly whether objects move or not.

Question 16

A model shows sunlight reaching a plant's green leaves. Chlorophyll captures the light energy. Photosynthesis uses light, water, and carbon dioxide to make food (sugar) that stores energy. Arrows show sun → plant. According to the model, where does the plant get energy to make food?

  1. the nutrients in the soil
  2. the sun's light energy (correct answer)
  3. the water in the soil
  4. the air around the plant

Explanation: This question tests the ability to use models to trace energy from the sun to plants (NGSS 5-PS3-1). Students must recognize that the sun is the original and only source of energy for plants to make food. Plants get their energy from the sun through a process called photosynthesis. Here's how it works: The sun produces light energy. This light energy travels to Earth and reaches plants. Green parts of plants (leaves) contain chlorophyll that captures the light energy. The plant uses this captured light energy, along with water from the soil and carbon dioxide from the air, to make food (sugar). The food stores the energy that originally came from sunlight. The soil provides water and nutrients (minerals), but NOT energy—only the sun provides energy. Without sunlight, plants cannot make food or grow. Choice B is correct because it identifies the sun's light energy as the source of energy for plants. This demonstrates understanding that models of photosynthesis show energy flowing from the sun to the plant, where it is captured by green leaves and used to make food that stores energy. Choice A fails because it claims the nutrients in the soil provide energy, when nutrients are minerals but not an energy source. To help students understand sun as energy source: Create a clear visual model with the sun at the top and arrows pointing down to plants, labeled 'light energy flows from sun to plant.' Emphasize the difference between energy (comes from sun) and matter/materials (water from soil, carbon dioxide from air). Use this comparison: 'Imagine building a house. You need materials (wood, nails—like water and CO₂) AND you need energy to do the work (your muscles, electricity for tools—like sunlight for plants). The materials aren't the energy; the sun's light is the energy.' Have students trace energy flow: 'Start at the sun. Where does the energy go? [To the plant] Where does the plant store it? [In food].' Practice identifying: 'Does soil give energy? [No, gives water and nutrients] Does water give energy? [No, it's a material] Does the sun give energy? [YES!]' Watch for: Students who confuse materials needed for photosynthesis (water, carbon dioxide) with energy source. Always reinforce: Sun = energy source. Soil/water/air = materials, not energy.

Question 17

Two bean plants grew similarly: one in soil, one in water with dissolved minerals (no soil). Based on the evidence, most plant matter comes from what?​

  1. mostly from soil minerals and soil particles
  2. mostly from water and soil, not air
  3. mostly from air (CO) and water, not soil (correct answer)
  4. mostly from the plant making matter by itself

Explanation: This question tests the ability to use evidence to explain that plant matter comes mostly from air and water (NGSS 5-LS1-1). Students must interpret experimental evidence to support the claim that plants get materials chiefly from air and water, not soil. Multiple types of evidence prove that most plant matter comes from air and water, not soil: Van Helmont's famous willow tree experiment showed that a tree gained 164 pounds while the soil lost only 0.1 pound—the tree's mass couldn't have come from soil because the soil barely decreased; chemical analysis shows plants are 45% carbon (from CO₂ in air), 42% oxygen (from H₂O and CO₂), and 6% hydrogen (from H₂O)—totaling about 93% from air and water, with only about 6-7% from soil minerals; hydroponic experiments prove plants can grow without soil at all, showing soil is not the source of plant matter; when scientists remove carbon dioxide from air, plants stop growing; when they add more CO₂, plants grow faster—this proves carbon from air is essential for building plant mass; all this evidence leads to one conclusion: plants get their matter chiefly from carbon dioxide in air and water, with small amounts of minerals from soil. Choice C is correct because it accurately states that plant matter comes mostly from air (CO₂) and water, not soil, which matches what the evidence demonstrates—plants grew similarly without soil in hydroponics, showing soil is not needed for most mass. Choice A fails because it claims soil is the main source when the evidence shows plants can grow without soil, representing the common misconception that plants get their matter from soil because we see plants growing in soil—but the evidence proves otherwise. To help students understand evidence for air and water as matter sources: Present Van Helmont's experiment as a mystery: 'The tree gained 164 pounds. The soil lost only 0.1 pound. Where did 164 pounds come from?' Students often guess soil until they see the numbers; emphasize: If the tree got 164 pounds from soil, the soil would weigh 164 pounds less—it doesn't—so the matter came from somewhere else; present the chemical composition evidence: 'Plants are made of carbon, hydrogen, and oxygen—where do these atoms come from? Carbon from CO₂ in air, hydrogen and oxygen from H₂O—that's 93% of the plant right there!'; use hydroponics as modern evidence: 'If plants got their matter from soil, they couldn't grow without soil—but they can—proving matter doesn't come mainly from soil'; teach the phrase: 'Plants don't eat soil—plants are made of air and water'; do the math together: 'If plants were made mostly of soil, the soil would disappear as the plant grows—does that happen? No—so plants must be made of something else—air and water'; watch for students who trust their intuition ('it must be soil') over evidence, or who don't understand that invisible gases (CO₂) have mass and can become solid plant matter; always return to evidence: 'What do the numbers show? What do experiments prove?'

Question 18

The model demonstrates that plants get their energy from what original source?

  1. the plant's roots
  2. the air around the plant
  3. the sun's light energy (correct answer)
  4. the soil under the plant

Explanation: This question tests the ability to use models to trace energy from the sun to plants (NGSS 5-PS3-1). Students must recognize that the sun is the original and only source of energy for plants to make food. The model shows that plants obtain all their energy from sunlight, which is captured by chlorophyll in leaves and used to make food through photosynthesis—no other source provides energy for plant growth. Choice C is correct because it identifies the sun's light energy as the original energy source for plants, demonstrating understanding that models of photosynthesis show energy flowing from sun to plant. Choice A fails because roots absorb water and nutrients from soil but not energy—roots cannot capture or absorb energy, only leaves with chlorophyll can capture the sun's light energy. Teaching tip: Create a clear distinction between what different plant parts do: 'Roots get water and minerals (not energy), leaves get light energy from sun' using visual models with different colored arrows for materials versus energy.

Question 19

Chen sealed 50 g ice in a bag, melted it; how did weight after compare?

  1. The weight stayed 50 g because the sealed bag kept all matter inside. (correct answer)
  2. The weight decreased because ice weighs less after it melts.
  3. The weight increased because water weighs more than ice.
  4. The weight changed because melting always changes total weight.

Explanation: This question tests understanding that weight can be measured before and after changes, and that total weight is conserved when heating, cooling, or mixing substances (NGSS 5-PS1-2). Students must interpret measurement data to recognize conservation of matter. The total weight of matter stays the same during physical changes like melting because matter is not created or destroyed—it just changes form or arrangement; for example, when ice melts to water, the particles go from an organized solid to a liquid that can flow, but the same number of particles are still there, so the weight stays at 50 grams, and measuring before and after provides evidence that matter is conserved. Choice A is correct because it accurately states that the weight stayed 50 g because the sealed bag kept all matter inside, demonstrating understanding that melting does not create or destroy matter, only changes its form, so the weight measured before equals the weight measured after. Choice B represents the misconception that the weight decreased because ice weighs less after it melts; this error occurs because students focus on observable changes like the state from solid to liquid and incorrectly assume these changes affect weight, or they think liquids are lighter without understanding particle conservation. To help students, conduct hands-on weighing activities where they predict, measure before melting, observe the change, measure after, and compare using sealed bags to ensure nothing escapes; create data tables with 'Before' and 'After' columns, emphasize the scale measures total matter present, watch for beliefs that melting changes weight, and always ask 'Did any new matter come in? If not, weight must stay the same.'

Question 20

In the flashlight experiment, why do farther stars appear dimmer from Earth?

  1. Farther stars appear dimmer because their light spreads out as it travels (correct answer)
  2. Farther stars appear dimmer because distance makes them produce less light
  3. Farther stars appear dimmer because distance affects flashlights, not stars
  4. Farther stars appear dimmer because all distant objects look equally dim

Explanation: This question tests students' understanding of how distance affects apparent brightness of stars from Earth (NGSS 5-ESS1-1). Distance is the primary factor determining apparent brightness (how bright something looks from a given location). As light travels outward from a source, it spreads over an increasingly large area - this means the same amount of light is distributed over more space, so any single observer receives less light and perceives the object as dimmer. This inverse square relationship means that an object twice as far away appears one-fourth as bright. This fundamental principle applies to all light sources: flashlights, light bulbs, and stars. Choice A is correct because it accurately describes the inverse relationship between distance and apparent brightness: as distance increases, apparent brightness decreases. This demonstrates understanding that distance is a causal factor in how bright objects appear to observers, and that this principle applies universally to stars and other light sources. Choice B represents the misconception that distance makes stars produce less light, confusing apparent brightness (what we observe) with actual brightness (light actually produced). This error often occurs because students attribute dimness to the star changing rather than light spreading. To help students: Demonstrate with identical flashlights or lamps at different distances in a darkened room. Use measuring tape to show specific distances and have students record observations at each distance. Create a graph plotting distance vs. apparent brightness to visualize the relationship. Use the analogy of sound - a shout sounds loud nearby but faint from far away using the same mechanism (spreading over larger area). Watch for: students who think objects actually produce less light when farther away, who believe the effect is due to air or space 'blocking' light rather than geometric spreading, or who don't recognize this as a universal principle applying to all light sources including stars.

Question 21

According to the model, where does the plant get energy to make food?​

  1. the sun's light energy (correct answer)
  2. the soil under the plant
  3. the water in the ground
  4. the air the plant uses

Explanation: This question tests the ability to use models to trace energy from the sun to plants (NGSS 5-PS3-1). Students must recognize that the sun is the original and only source of energy for plants to make food. In photosynthesis, plants capture the sun's light energy with chlorophyll in their green leaves and use this energy, along with water and carbon dioxide, to make food (sugar) that stores the energy—the soil, water, and air provide necessary materials but not energy. Choice A is correct because it identifies the sun's light energy as the energy source for making food, showing understanding that models of photosynthesis trace energy flow from sun to plant. Choices B, C, and D fail because they confuse materials with energy: soil provides water and nutrients but not energy, water is a raw material but not an energy source, and air provides carbon dioxide but not energy—only the sun provides the energy plants need for photosynthesis. To help students identify the energy source: Use a clear diagram showing energy flowing only from the sun (not from soil, water, or air), practice asking 'Does this give energy or materials?' for each component, and reinforce that sun = energy while everything else = materials needed for photosynthesis.

Question 22

After a storm, rainwater (hydrosphere) flows downhill over soil (geosphere); what happens to land?

  1. Soil absorbs all water, so the hillside becomes steeper and taller.
  2. Soil erosion causes rain to fall harder during the next storm.
  3. Running water erodes soil, forming small channels and gullies. (correct answer)
  4. Rain and soil interact, but the hillside stays exactly the same.

Explanation: This question tests students' ability to explain how interactions between Earth systems affect land, water, or living things (NGSS 5-ESS2-1). Earth's systems constantly interact, and these interactions cause changes to land, water, and life; for instance, rainwater flowing over soil (hydrosphere-geosphere interaction) erodes it, forming channels, while plants' roots break down rock, and these processes can be fast like after a storm or slow over time. Choice C is correct because it accurately describes how running water erodes soil, forming small channels and gullies, demonstrating understanding of cause-effect relationships in Earth systems and showing the student can trace from interaction (cause) to change (effect) on land. Choice D is incorrect because it describes no change to the hillside, an error that commonly occurs when students identify interaction but don't understand the resulting effects or recognize the causal mechanism. To help students: Use explicit cause-effect mapping with arrows and boxes: [Hydrosphere-geosphere interaction] → [Erosion forming channels on land]. Practice with familiar examples first: rain + mud → ruts (effect on land); create before/after diagrams showing the change; use sentence frame: 'When [system 1] and [system 2] interact by [action], it affects [land] by [change].' Watch for students who miss the effect or confuse systems, and connect to observable phenomena like erosion in schoolyards after rain.

Question 23

Which evidence best supports the argument that the sun appears brighter because it is closer?

  1. The sun looks brightest because it is the brightest object we can see.
  2. The sun is 93 million miles away, while Sirius is 51 trillion miles away. (correct answer)
  3. The sun is made mostly of hydrogen and helium, like many other stars.
  4. Distant stars appear just as bright as nearby stars from Earth at night.

Explanation: This question tests students' ability to support scientific arguments with observational evidence about star brightness and distance (NGSS 5-ESS1-1). Scientific arguments require evidence - observations, measurements, or experimental results - that support the claim. A complete argument includes: (1) a claim (the sun appears brighter because it's closer), (2) evidence (specific observations and measurements), and (3) reasoning (explaining how the evidence supports the claim). In this case, the evidence must show both that the sun appears brighter AND that it is much closer than other stars, with reasoning that connects distance to apparent brightness. Choice B is correct because it provides specific evidence from the stimulus that directly supports the argument: it gives concrete distance measurements showing the sun is 93 million miles away while Sirius is 51 trillion miles away. This demonstrates understanding that evidence must be relevant, specific, and logically connected to the argument. The student shows they can identify which data points matter and explain why they support the conclusion. Choice A fails to support the argument because it uses circular reasoning - it simply restates the observation (the sun looks brightest) without providing evidence about distance. This error is common when students don't understand that supporting an argument requires showing logical connection between evidence and claim, not just stating related facts. Students may confuse interesting information with relevant evidence, or may not recognize when their 'evidence' is actually just restating the conclusion. To help students: Practice the Claim-Evidence-Reasoning (CER) framework explicitly. Give students a claim and multiple pieces of data, asking them to select which data supports the claim and explain why. Model think-alouds: 'Does this evidence show what the claim says? How does it connect?' Use sentence frames: 'This evidence supports the argument because it shows that... and this explains why...' Create matching activities between claims and appropriate evidence. Watch for: students who confuse relevant with interesting, who don't explain the connection between evidence and claim, who use opinions or beliefs instead of data, or who engage in circular reasoning. Explicitly teach that good evidence can be measured, observed, or tested, and must specifically relate to the claim being made.

Question 24

What form does the sun's energy take when stored in a plant's food?​

  1. chemical energy stored in sugar and starch (correct answer)
  2. light energy stored in the leaf surface
  3. heat energy stored in the plant's water
  4. electrical energy stored in plant veins

Explanation: This question tests the ability to use models to explain how plants store energy from sunlight in food (NGSS 5-PS3-1). Students must understand that light energy is converted to chemical energy stored in plant food. When plants capture light energy from the sun, they don't store it as light—they transform it into a different form of energy that can be stored. During photosynthesis, plants use light energy to make sugar (a type of food). The sugar molecules store the energy in their chemical bonds—this is called chemical energy. Some sugar is used right away by the plant for growth, but much of it is stored for later use, either as sugar or as starch (starch is made from many sugar molecules connected together, and is good for long-term storage). Choice A is correct because it accurately describes that plants store energy as chemical energy stored in sugar and starch. This demonstrates understanding that energy is stored in a usable form (food molecules) in various parts of the plant, and that the stored form is chemical energy, not light or heat. Choice B fails because it claims energy is stored as light, when light energy is converted to chemical energy in food. Energy must be stored in a stable form that can be used later—sugar and starch molecules store energy in chemical bonds, not in water, chlorophyll, light, or heat. To help students understand energy storage in plants: Use food examples they eat—potato (stores energy in underground stem), carrot (stores in root), apple (stores in fruit), corn (stores in seeds), lettuce (stores in leaves). Demonstrate the transformation: draw an energy flow diagram with Sun (light energy) → Plant captures light → Plant makes sugar → Sugar stores energy as chemical energy → Stored in plant parts.

Question 25

Emma used hand sanitizer; it felt wet, then disappeared from view—do the alcohol particles still exist?

  1. The particles were absorbed by skin and no longer exist separately.
  2. The particles still exist and moved into the air as gas. (correct answer)
  3. The particles vanished because they could not be seen anymore.
  4. The particles turned into energy, so the liquid disappeared.

Explanation: This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When hand sanitizer (containing alcohol) evaporates from skin, the alcohol particles don't vanish—they change from liquid to gas and move into the surrounding air, becoming too spread out to see but still present. Choice B is correct because it accurately states that the particles still exist and moved into the air as gas, demonstrating understanding that particles are conserved during evaporation. Choices A, C, and D represent misconceptions that particles can be absorbed and cease to exist separately, vanish when invisible, or transform into energy—these errors occur because students don't yet understand that particles maintain their identity even when changing states or locations. To help students: Have them smell the alcohol scent in the air after using hand sanitizer as evidence the particles still exist, and use sentence frames like 'The alcohol particles were on my hands. Now they are in the air around me.'