Elementary School Science Quiz: Testing Plants Need Sunlight
20 questions · exam conditions
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Testing Plants Need SunlightQuestion 1 of 20

Maya tests: Plant A in sun, Plant B in dark. What is different?​

The amount of sunlight each plant gets
The plant type used for each pot
The size of the pots for each plant
The amount of water each plant gets
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Elementary School Science Quiz

Elementary School Science Quiz: Testing Plants Need Sunlight

Practice Testing Plants Need Sunlight in Elementary School Science with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Testing Plants Need Sunlight, giving you a quick way to practice the rules, question types, and explanations that matter most for Elementary School Science.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

Maya tests: Plant A in sun, Plant B in dark. What is different?​

  1. The amount of sunlight each plant gets (correct answer)
  2. The plant type used for each pot
  3. The size of the pots for each plant
  4. The amount of water each plant gets
Explanation: This question aligns with the skill 2-LS2-1: Planning an investigation to test whether plants need sunlight to grow. To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is A because it correctly identifies the test variable as the amount of sunlight, which is the one thing that changes in a fair test to isolate its effect on plant growth. A fair test requires keeping all variables same except one and comparing two groups, and the answer shows understanding that we need to identify what is deliberately different to test sunlight. Choice B is incorrect because it suggests the plant type is different, but in a fair test, plant type must stay the same to ensure differences in growth are due to sunlight, not plant variety; this error happens when students confuse what to keep same versus what to change. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is [question]. We need TWO groups. Group 1: [with sunlight]. Group 2: [without sunlight]. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Emphasize: If we change MORE than sunlight (like giving different water), we won't know which thing caused the difference—that's not fair! Practice identifying variables—'What are we testing? What stays the same? What do we observe?' Make it real: Have students actually conduct this investigation if possible. Watch for: Students who want to change multiple things ('more water AND sunlight'), don't include comparison group, use different plants, or describe results instead of planning. Use question stems: 'How can we test  ?' triggers planning; 'What happened?' triggers results—keep these separate.

Question 2

Marcus wants to test sunlight. Which thing should he change in his test?

  1. How much sunlight the plant gets (correct answer)
  2. Use different pots for each plant
  3. Give different water amounts each day
  4. Use different soil in each pot
Explanation: This question aligns with the skill 2-LS2-1: Planning an investigation to test whether plants need sunlight to grow. To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is A because it correctly identifies the test variable to change—how much sunlight the plant gets—to isolate its effect in the investigation. A fair test requires changing only one thing, and the answer shows understanding that we change sunlight while keeping others same. Choice B is incorrect because using different pots introduces another variable, which is not what we change for testing sunlight; this error happens when students confuse controlled variables with the test variable. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is [question]. We need TWO groups. Group 1: [with sunlight]. Group 2: [without sunlight]. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Emphasize: If we change MORE than sunlight (like giving different water), we won't know which thing caused the difference—that's not fair! Practice identifying variables—'What are we testing? What stays the same? What do we observe?' Make it real: Have students actually conduct this investigation if possible. Watch for: Students who want to change multiple things ('more water AND sunlight'), don't include comparison group, use different plants, or describe results instead of planning. Use question stems: 'How can we test  ?' triggers planning; 'What happened?' triggers results—keep these separate.

Question 3

Chen gives both plants the same water each day. Why does this help?

  1. It makes the sunlight different for each plant
  2. It keeps water the same so only sunlight changes (correct answer)
  3. It helps the dark plant get extra light
  4. It changes two things at once to test faster
Explanation: This question aligns with the skill 2-LS2-1: Planning an investigation to test whether plants need sunlight to grow. To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is B because it explains that keeping water the same ensures only sunlight changes, which is key to a fair test. A fair test requires keeping all variables same except one and comparing two groups, and the answer shows understanding that we control variables to isolate sunlight. Choice D is incorrect because it suggests changing two things at once, which doesn't speed up the test but confuses the results; this error happens when students don't understand fair test and think multiple changes are okay. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is [question]. We need TWO groups. Group 1: [with sunlight]. Group 2: [without sunlight]. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Emphasize: If we change MORE than sunlight (like giving different water), we won't know which thing caused the difference—that's not fair! Practice identifying variables—'What are we testing? What stays the same? What do we observe?' Make it real: Have students actually conduct this investigation if possible. Watch for: Students who want to change multiple things ('more water AND sunlight'), don't include comparison group, use different plants, or describe results instead of planning. Use question stems: 'How can we test  ?' triggers planning; 'What happened?' triggers results—keep these separate.

Question 4

Emma has one plant. How can she improve her plan to test sunlight?

  1. Add a second plant kept in the dark for comparison (correct answer)
  2. Water it different amounts each day
  3. Use a different kind of plant each week
  4. Change sunlight and water at the same time
Explanation: This question aligns with the skill 2-LS2-1: Planning an investigation to test whether plants need sunlight to grow. To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is A because it improves the plan by adding a comparison group—a second plant in the dark— which is essential for a fair test to compare with and without sunlight. A fair test requires comparing two groups, and the answer shows understanding that we need a control to isolate the test variable. Choice D is incorrect because changing sunlight and water at the same time introduces too many variables, making it not a fair test; this error happens when students think multiple changes are better but don't understand controlling variables. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is [question]. We need TWO groups. Group 1: [with sunlight]. Group 2: [without sunlight]. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Emphasize: If we change MORE than sunlight (like giving different water), we won't know which thing caused the difference—that's not fair! Practice identifying variables—'What are we testing? What stays the same? What do we observe?' Make it real: Have students actually conduct this investigation if possible. Watch for: Students who want to change multiple things ('more water AND sunlight'), don't include comparison group, use different plants, or describe results instead of planning. Use question stems: 'How can we test  ?' triggers planning; 'What happened?' triggers results—keep these separate.

Question 5

Marcus wants to test sunlight. Which thing should he change in his test?​

  1. How much sunlight the plant gets (correct answer)
  2. Use different pots for each plant
  3. Give different water amounts each day
  4. Use different soil in each pot
Explanation: This question aligns with the skill 2-LS2-1: Planning an investigation to test whether plants need sunlight to grow. To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is A because it correctly identifies the test variable to change—how much sunlight the plant gets—to isolate its effect in the investigation. A fair test requires changing only one thing, and the answer shows understanding that we change sunlight while keeping others same. Choice B is incorrect because using different pots introduces another variable, which is not what we change for testing sunlight; this error happens when students confuse controlled variables with the test variable. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is [question]. We need TWO groups. Group 1: [with sunlight]. Group 2: [without sunlight]. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Emphasize: If we change MORE than sunlight (like giving different water), we won't know which thing caused the difference—that's not fair! Practice identifying variables—'What are we testing? What stays the same? What do we observe?' Make it real: Have students actually conduct this investigation if possible. Watch for: Students who want to change multiple things ('more water AND sunlight'), don't include comparison group, use different plants, or describe results instead of planning. Use question stems: 'How can we test  ?' triggers planning; 'What happened?' triggers results—keep these separate.

Question 6

Chen gives both plants the same water. Why does this make the test fair?

  1. So only sunlight is different between the plants (correct answer)
  2. So the dark plant gets more help to grow
  3. So the sunny plant can be moved each day
  4. So soil does not matter at all
Explanation: This question assesses the skill from 2-LS2-1: Planning an investigation to test whether plants need sunlight to grow. To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: [1-2 weeks]. This setup is fair because only sunlight is different. The correct answer is A because it explains that keeping water the same ensures only sunlight is different, making the test fair. A fair test requires keeping all variables same except one, and the answer shows understanding that we control variables to isolate sunlight. Choice B is incorrect because it suggests giving the dark plant more help, which confuses variables and doesn't explain fair test; this error happens when students don't understand fair test. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is [question]. We need TWO groups. Group 1: [with sunlight]. Group 2: [without sunlight]. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Emphasize: If we change MORE than sunlight (like giving different water), we won't know which thing caused the difference—that's not fair! Practice identifying variables—'What are we testing? What stays the same? What do we observe?' Make it real: Have students actually conduct this investigation if possible. Watch for: Students who want to change multiple things ('more water AND sunlight'), don't include comparison group, use different plants, or describe results instead of planning. Use question stems: 'How can we test  ?' triggers planning; 'What happened?' triggers results—keep these separate.

Question 7

Yuki measures both plants on Day 0 and Day 14. What will she compare?

  1. The sunlight in the room and the soil color
  2. The height and leaf number for both plants (correct answer)
  3. The kind of ruler used for each plant
  4. The number of times the door opens
Explanation: This question aligns with the skill 2-LS2-1: Planning an investigation to test whether plants need sunlight to grow. To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is B because it identifies what to compare—height and leaf number for both plants—which are key observations to measure growth differences due to sunlight. A fair test requires observing relevant results, and the answer shows understanding that we compare growth metrics between groups. Choice A is incorrect because comparing sunlight in the room and soil color is not about observing plant growth; this error happens when students confuse what to observe with setup variables. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is [question]. We need TWO groups. Group 1: [with sunlight]. Group 2: [without sunlight]. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Emphasize: If we change MORE than sunlight (like giving different water), we won't know which thing caused the difference—that's not fair! Practice identifying variables—'What are we testing? What stays the same? What do we observe?' Make it real: Have students actually conduct this investigation if possible. Watch for: Students who want to change multiple things ('more water AND sunlight'), don't include comparison group, use different plants, or describe results instead of planning. Use question stems: 'How can we test  ?' triggers planning; 'What happened?' triggers results—keep these separate.

Question 8

Keisha plans two marigolds. What makes the test fair?

  1. Change sunlight and water at the same time
  2. Use different plants and different pots
  3. Keep everything same except sunlight (correct answer)
  4. Put both plants in the dark
Explanation: This question tests understanding of planning an investigation to determine if plants need sunlight to grow (2-LS2-1). To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is C (Keep everything same except sunlight) because it correctly states the fundamental principle of a fair test. A fair test requires keeping all variables same except one—the test variable. The answer shows understanding that we isolate sunlight as the only changing factor. Choice A (Change sunlight and water at the same time) is incorrect because it changes two variables, making it impossible to know which caused any differences. This error happens when students don't understand that we must change only one thing at a time. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is do plants need sunlight? We need TWO groups. Group 1: gets sunlight. Group 2: gets no sunlight. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Emphasize: If we change MORE than sunlight (like giving different water), we won't know which thing caused the difference—that's not fair! Practice identifying variables—'What are we testing? What stays the same? What do we observe?' Watch for: Students who want to change multiple things ('more water AND sunlight').

Question 9

Emma plans a fair test. Which plan changes too many things at once?

  1. Same plants; one in sun and one in dark; same water
  2. One plant in sun with more water; one in dark with less water (correct answer)
  3. Same plants; one in sun and one in dark; same soil
  4. Same plants; one in sun and one in dark; same pot size
Explanation: This question tests understanding of planning an investigation to test whether plants need sunlight to grow (2-LS2-1). To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is B because it correctly identifies a plan that changes too many things—both sunlight AND water amount change. A fair test requires changing only one variable at a time. The answer shows understanding that changing multiple variables makes the test unfair because we won't know which change caused the results. Choices A, C, and D are incorrect because they each describe fair tests where only sunlight changes while other variables stay the same. This error happens when students focus on finding the 'good' plan instead of identifying the problematic one. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is do plants need sunlight? We need TWO groups. Group 1: with sunlight. Group 2: without sunlight. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Emphasize: If we change MORE than sunlight (like giving different water), we won't know which thing caused the difference—that's not fair! Practice identifying variables—'What are we testing? What stays the same? What do we observe?' Watch for: Students who want to change multiple things ('more water AND sunlight').

Question 10

Emma plans to test sunlight. Which mistake makes the test not fair?

  1. Use the same plant type in both pots
  2. Give both plants the same water each day
  3. Put one plant in sun and one in dark
  4. Use different plants and different soil (correct answer)
Explanation: This question assesses the skill from 2-LS2-1: Planning an investigation to test whether plants need sunlight to grow. To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: [1-2 weeks]. This setup is fair because only sunlight is different. The correct answer is D because it identifies the mistake of using different plants and soil, which makes the test not fair by changing multiple variables. A fair test requires keeping all variables same except one, and the answer shows understanding of what violates the fair test. Choice A is incorrect because using the same plant type is actually correct for a fair test, not a mistake; this error happens when students confuse what to keep same. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is [question]. We need TWO groups. Group 1: [with sunlight]. Group 2: [without sunlight]. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Emphasize: If we change MORE than sunlight (like giving different water), we won't know which thing caused the difference—that's not fair! Practice identifying variables—'What are we testing? What stays the same? What do we observe?' Make it real: Have students actually conduct this investigation if possible. Watch for: Students who want to change multiple things ('more water AND sunlight'), don't include comparison group, use different plants, or describe results instead of planning. Use question stems: 'How can we test  ?' triggers planning; 'What happened?' triggers results—keep these separate.

Question 11

Amir makes a prediction for his test. Which prediction fits the plan?

  1. The plant in the sun will grow better than the plant in the dark (correct answer)
  2. The plant in the dark will grow taller because it is cooler
  3. Both plants will get the same sunlight in different places
  4. The plant with less water will grow the most leaves
Explanation: This question tests understanding of planning an investigation to test whether plants need sunlight to grow (2-LS2-1). To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is A because it correctly states a prediction that fits the investigation plan—predicting the sunny plant will grow better than the dark plant directly relates to testing if plants need sunlight. A fair test requires predictions that match what we're testing. The answer shows understanding that predictions should relate to the test variable (sunlight) and expected outcomes. Choice C is incorrect because it says both plants will get the same sunlight, which contradicts the plan where one gets sun and one doesn't. This error happens when students confuse the test setup or don't understand that we're creating different conditions on purpose. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is do plants need sunlight? We need TWO groups. Group 1: with sunlight. Group 2: without sunlight. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Emphasize: If we change MORE than sunlight (like giving different water), we won't know which thing caused the difference—that's not fair! Practice identifying variables—'What are we testing? What stays the same? What do we observe?' Help students make predictions that match their test plan.

Question 12

Yuki uses two same plants. Which plan is NOT a fair test?

  1. One in sun, one in dark, same water
  2. One in sun, one in dark, same soil
  3. One in sun gets more water than the dark plant (correct answer)
  4. Measure both plants with a ruler each week
Explanation: This question tests understanding of planning an investigation to determine if plants need sunlight to grow (2-LS2-1). To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is C (One in sun gets more water than the dark plant) because it correctly identifies a plan that is NOT fair—it changes both sunlight AND water amount. A fair test requires changing only one variable, but this changes two. The answer shows understanding that changing multiple variables makes the test unfair. Choices A and B (same water, same soil) are incorrect as answers because they actually describe fair test practices—keeping variables the same. This error happens when students misread 'NOT a fair test' and choose what makes a good fair test instead. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is do plants need sunlight? We need TWO groups. Group 1: gets sunlight. Group 2: gets no sunlight. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Emphasize: If we change MORE than sunlight (like giving different water), we won't know which thing caused the difference—that's not fair! Practice identifying fair vs unfair tests with 'NOT' questions carefully.

Question 13

Emma predicts what will happen. Which prediction fits this plan?

  1. The dark plant will grow better than the sunny plant
  2. Both plants will grow the same with different water
  3. The sunny plant will grow better than the dark plant (correct answer)
  4. Sunlight does not matter, only pot size matters
Explanation: This question tests understanding of planning an investigation to determine if plants need sunlight to grow (2-LS2-1). To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is C (The sunny plant will grow better than the dark plant) because it correctly predicts what will happen when testing if plants need sunlight. A fair test requires making predictions based on the variable being tested. The answer shows understanding that if plants need sunlight, the plant with sunlight should grow better. Choice A (The dark plant will grow better than the sunny plant) is incorrect because it contradicts what we know about plants needing sunlight for photosynthesis and growth. This error happens when students make predictions that don't align with the investigation's purpose or scientific understanding. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is do plants need sunlight? We need TWO groups. Group 1: gets sunlight. Group 2: gets no sunlight. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Help students connect predictions to their test variable: 'If we're testing sunlight, what do we think will happen?' Practice making reasonable predictions based on the investigation plan.

Question 14

Jamal changes only one thing in his plant test. What is it?

  1. The amount of soil in each pot
  2. The type of plant in each pot
  3. The amount of water each plant gets
  4. The sunlight each plant gets (correct answer)
Explanation: This question tests understanding of planning an investigation to test whether plants need sunlight to grow (2-LS2-1). To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is D because it correctly identifies the test variable—sunlight is the ONE thing we change. A fair test requires changing only one variable while keeping everything else the same. The answer shows understanding that we isolate sunlight as the test variable. Choice A is incorrect because the amount of soil should stay the same, not change. This error happens when students confuse what to keep same versus what to change in a fair test. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is do plants need sunlight? We need TWO groups. Group 1: with sunlight. Group 2: without sunlight. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Emphasize: If we change MORE than sunlight (like giving different water), we won't know which thing caused the difference—that's not fair! Practice identifying variables—'What are we testing? What stays the same? What do we observe?' Watch for: Students who want to change multiple things ('more water AND sunlight'), don't include comparison group, use different plants, or describe results instead of planning.

Question 15

Sofia tests: Plant A in sun, Plant B in dark. What is different?

  1. Plant type
  2. Soil amount
  3. Sunlight (correct answer)
  4. Water amount
Explanation: This question tests understanding of planning an investigation to determine if plants need sunlight to grow (2-LS2-1). To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is C (Sunlight) because it correctly identifies what is different between Sofia's two plants. A fair test requires keeping all variables same except one. The answer shows understanding that we isolate sunlight as the test variable. Choice A (Plant type) is incorrect because using different plant types would not be a fair test—we wouldn't know if differences were due to sunlight or plant type. This error happens when students don't understand that we must use the same type of plant to compare fairly. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is do plants need sunlight? We need TWO groups. Group 1: gets sunlight. Group 2: gets no sunlight. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Emphasize: If we change MORE than sunlight (like giving different water), we won't know which thing caused the difference—that's not fair! Practice identifying variables—'What are we testing? What stays the same? What do we observe?' Make it real: Have students actually conduct this investigation if possible.

Question 16

Marcus tests two marigolds: one in window, one in cabinet. What is the test question?​

  1. Do plants need sunlight to grow? (correct answer)
  2. Do plants need different soil colors to grow?
  3. Do plants grow faster in bigger pots only?
  4. Do plants grow better when we sing to them?
Explanation: This question tests understanding of planning an investigation to test whether plants need sunlight to grow (2-LS2-1). To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is A because it correctly identifies the test question—Do plants need sunlight to grow? The setup (one in window with light, one in cabinet without light) matches testing sunlight. The answer shows understanding that the test question must match what we're changing. Choice D is incorrect because the setup doesn't test singing—it tests light vs dark, not singing vs not singing. This error happens when students don't connect the setup to the question being tested. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Model planning: Start with the question—'What are we trying to find out?' Then match the setup to the question. 'Our question is do plants need sunlight? So we need one WITH sunlight and one WITHOUT sunlight.' Use concrete examples: Show the actual setup—plant in window (light) and plant in cabinet (dark). Ask: 'What's different? That tells us what we're testing!' Practice matching questions to setups. Watch for: Students who don't connect the test variable to the research question.

Question 17

Chen asks, "Do plants need sunlight to grow?" Which setup is best?

  1. Put one plant in sun and one in dark; water both the same (correct answer)
  2. Put one plant in sun and give it more water
  3. Put one plant in the sun and watch it grow
  4. Use two different plants and put both in the sun
Explanation: This question tests understanding of planning an investigation to test whether plants need sunlight to grow (2-LS2-1). To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is A because it correctly describes proper setup with two groups for comparison and keeping water the same. A fair test requires comparing two groups while changing only sunlight. The answer shows understanding that we need comparison and we control variables. Choice B is incorrect because it changes two variables—sunlight AND water amount. This error happens when students don't understand fair test and think we can change multiple things at once. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is do plants need sunlight? We need TWO groups. Group 1: with sunlight. Group 2: without sunlight. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Emphasize: If we change MORE than sunlight (like giving different water), we won't know which thing caused the difference—that's not fair! Practice identifying variables—'What are we testing? What stays the same? What do we observe?' Use question stems: 'How can we test  ?' triggers planning; 'What happened?' triggers results—keep these separate.

Question 18

Carlos will test sunlight for 10 days. What will he compare?

  1. Plant in sun and plant in dark (correct answer)
  2. Morning and afternoon temperatures
  3. Two different kinds of seeds
  4. Watered plant and not watered plant
Explanation: This question tests understanding of planning an investigation to determine if plants need sunlight to grow (2-LS2-1). To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is A (Plant in sun and plant in dark) because it correctly identifies what Carlos will compare to test sunlight. A fair test requires comparing two groups with different sunlight conditions. The answer shows understanding that we need one plant with sunlight and one without to make a comparison. Choice D (Watered plant and not watered plant) is incorrect because it tests water, not sunlight—this would answer a different question about whether plants need water. This error happens when students confuse different variables or don't focus on what the investigation is testing. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is do plants need sunlight? We need TWO groups. Group 1: gets sunlight. Group 2: gets no sunlight. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Emphasize: If we change MORE than sunlight (like giving different water), we won't know which thing caused the difference—that's not fair! Practice identifying variables—'What are we testing? What stays the same? What do we observe?' Use question stems to keep focus on the test variable.

Question 19

Jamal tests two plants: one gets sunlight, one gets no sunlight. What is changed?​

  1. The amount of sunlight each plant gets (correct answer)
  2. The kind of soil in each pot
  3. The size of the pots
  4. The amount of water each plant gets
Explanation: This question tests understanding of planning an investigation to test whether plants need sunlight to grow (2-LS2-1). To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is A because it correctly identifies the test variable—the amount of sunlight each plant gets. A fair test requires changing only sunlight while keeping everything else the same. The answer shows understanding that we isolate sunlight as the test variable. Choice B is incorrect because the kind of soil should stay the same, not change—it's a controlled variable, not the test variable. This error happens when students confuse what to keep same vs what to change. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is do plants need sunlight? We need TWO groups. Group 1: with sunlight. Group 2: without sunlight. Both get same water, same soil. Then we compare!' Practice identifying variables—'What are we testing? What stays the same? What do we observe?' Make it real: Have students actually conduct this investigation if possible. Watch for: Students who want to change multiple things ('more water AND sunlight'), don't include comparison group, or confuse controlled variables with test variables.

Question 20

Keisha will measure both plants on Day 0 and Day 14. What will she compare?​

  1. The plant in sun and the plant in dark (correct answer)
  2. Two sunny plants in different pots
  3. The same plant before and after watering once
  4. Two different kinds of plants in different rooms
Explanation: This question tests understanding of planning an investigation to test whether plants need sunlight to grow (2-LS2-1). To find out if plants need sunlight, we plan a FAIR TEST. Fair test means we have TWO GROUPS to compare—one with sunlight, one without sunlight. Everything else must be THE SAME (same water, same soil, same plant type). We only change ONE thing—sunlight. This way, if plants grow differently, we know it's because of sunlight, not something else. We observe and measure plant growth to compare. The investigation tests: Do plants need sunlight to grow? SETUP: Plant A gets sunlight. Plant B gets no sunlight (dark). KEEP SAME: water amount, soil, plant type, pot size. TEST VARIABLE (what we change): sunlight. OBSERVE: plant height, number of leaves, leaf color, health. Time: 1-2 weeks. This setup is fair because only sunlight is different. The correct answer is A because it correctly identifies what to compare—the plant in sun and the plant in dark. A fair test requires comparing two groups where only sunlight differs. The answer shows understanding that we need comparison between different light conditions. Choice C is incorrect because comparing the same plant before and after watering once doesn't test sunlight at all—it tests watering, not our question. This error happens when students confuse different investigations or don't focus on the test variable. To help students plan investigations: Teach fair test concept explicitly—change ONE thing (test variable), keep everything else SAME (controlled variables), observe the DIFFERENCE (results). Use 'Same/Different' organizer: What's SAME (water, soil, type, pot), What's DIFFERENT (sunlight—yes or no). Model planning: 'Our question is do plants need sunlight? We need TWO groups. Group 1: with sunlight. Group 2: without sunlight. Both get same water, same soil. Then we compare!' Use concrete examples: Show two plants, physically demonstrate putting one in sun and one in dark, show measuring both. Watch for: Students who don't include comparison group or confuse what they're testing.