5th Grade Science Quiz: Plant Matter From Air And Water
20 questions · exam conditions
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Plant Matter From Air And WaterQuestion 1 of 20

Van Helmont's willow tree gained 164 lb, but the soil lost only 0.1 lb after 5 years of watering. This counters the idea that soil becomes most of the tree. Based on the evidence, what is the best conclusion about new plant mass?

mostly from soil, because soil loss is hard to measure
mostly from air and water, since soil mass changed very little
mostly from sunlight and air, because light makes plants heavier
equally from air, soil, and water, because all are important
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5th Grade Science Quiz

5th Grade Science Quiz: Plant Matter From Air And Water

Practice Plant Matter From Air And Water in 5th Grade 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 Plant Matter From Air And Water, giving you a quick way to practice the rules, question types, and explanations that matter most for 5th Grade 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

Van Helmont's willow tree gained 164 lb, but the soil lost only 0.1 lb after 5 years of watering. This counters the idea that soil becomes most of the tree. Based on the evidence, what is the best conclusion about new plant mass?

  1. mostly from soil, because soil loss is hard to measure
  2. mostly from air and water, since soil mass changed very little (correct answer)
  3. mostly from sunlight and air, because light makes plants heavier
  4. equally from air, soil, and water, because all are important
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, and 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 B is correct because it accurately states that plant matter comes mostly from air and water, since soil mass changed very little, which matches Van Helmont's evidence where the tree gained 164 lb but soil lost only 0.1 lb, countering the idea that soil becomes most of the plant. Choice A fails because it claims soil is the main source despite the minimal soil loss, representing the common misconception that soil is hard to measure but still the primary source—but the evidence proves otherwise. To help students understand evidence for air and water as matter sources: Present Van Helmont's as a mystery: 'Tree gained 164 lb, soil lost 0.1 lb—where did it come from?'; do the math: 'If from soil, soil would lose 164 lb, but it didn't'; teach: 'Plants are made of air and water,' and focus on what experiments prove over intuition.

Question 2

A 100-gram plant (dry mass) is about 45 g carbon from CO₂ in air, 42 g oxygen from water and CO₂, and 6 g hydrogen from water—93 g total from air and water. Only about 7 g comes from soil minerals. What does this data demonstrate about plant matter?

  1. mostly from air and water, with a small part from soil minerals (correct answer)
  2. mostly from soil minerals, because roots absorb minerals first
  3. mostly from water and soil, because air cannot become solid matter
  4. the evidence does not show where plant matter comes from clearly
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, and 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 A is correct because it accurately states that plant matter comes mostly from air and water, with a small part from soil minerals, which matches the data showing 93 g from air and water and only 7 g from soil in a 100-gram plant, demonstrating the sources of plant atoms. Choice B fails because it claims soil minerals are the main source when the evidence shows only 7% from soil, representing the common misconception that roots absorb most mass from soil—but the evidence proves otherwise. To help students understand evidence for air and water as matter sources: Present the composition data: '45g carbon from air, 42g oxygen and 6g hydrogen from water—that's 93% not from soil!'; calculate percentages together: 'Only 7% from soil, so air and water are chief sources'; address that air can become solid, asking: 'What do the numbers prove?'

Question 3

Plants in a chamber with no CO did not grow, but plants with extra CO grew larger. What does this evidence show about plant matter sources?

  1. mostly from soil, because CO only helps leaves
  2. mostly from air (CO) and water, not soil (correct answer)
  3. mostly from water and soil, not air
  4. equally from sunlight, soil, and water
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 B is correct because it accurately states that plant matter comes mostly from air (CO₂) and water, not soil, which matches what the evidence demonstrates—removing CO₂ stopped growth and adding it increased growth, showing CO₂ from air is essential for mass. Choice A fails because it claims soil is the main source and downplays CO₂ when the evidence shows CO₂ is crucial, 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 4

Plants were grown in chambers: normal air (0.04% CO₂) grew normally, enriched CO₂ (0.08% CO₂) grew faster and larger, and no CO₂ caused plants to die. What does this evidence show about where plant matter comes from?

  1. mostly from soil minerals, because minerals make plants bigger
  2. mostly from water and soil, because CO₂ is just a gas
  3. mostly from air (CO₂) and water, not mainly from soil (correct answer)
  4. mostly from sunlight and water, because light is the energy source
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, and 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 mainly from soil, which matches the CO₂ chamber evidence where removing CO₂ stopped growth and adding it increased growth, showing carbon from air is key for plant mass. Choice A fails because it claims soil minerals are the main source when the evidence shows CO₂ from air is essential, representing the common misconception that gases like CO₂ can't contribute to solid matter—but the evidence proves otherwise. To help students understand evidence for air and water as matter sources: Present the CO₂ experiment: 'Plants died without CO₂ but grew faster with more—proving air's carbon builds plant mass'; emphasize: 'CO₂ is invisible but has mass that becomes part of the plant'; watch for students who think air can't add mass, and return to: 'What do experiments prove about CO₂?'

Question 5

Two bean plants grew for 4 weeks: one in soil, one in water with dissolved minerals (no soil). Both grew almost the same size. What does this evidence show about the source of plant matter?

  1. mostly from soil, because plants need dirt to make new mass
  2. mostly from water only, because water is the only input
  3. mostly from air and water, while soil minerals are a small part (correct answer)
  4. equally from air, water, and soil, because both plants grew
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. The hydroponic experiment provides clear evidence: a plant grown in water with dissolved minerals (no soil) grew almost the same size as a plant grown in soil—this proves plants can grow without soil at all, showing soil is not the main source of plant matter. If soil were the main source of plant matter, the plant without soil couldn't have grown to nearly the same size. Choice C is correct because it accurately states that plant matter comes mostly from air and water, while soil minerals are a small part, which matches what the evidence demonstrates—both plants grew similarly despite one having no soil. Choice A fails because it claims matter comes mostly from soil when the evidence shows a plant grew just fine without any soil; this represents the misconception that plants need dirt to make new mass. To help students understand hydroponic evidence: Ask: 'If plants got their matter from soil, could they grow without soil? No! But this plant did grow without soil.' Emphasize: 'The plant in water grew almost the same as the one in soil—this proves matter doesn't come mainly from soil.' Connect to modern examples: 'Lettuce and tomatoes grown in water (hydroponics) prove plants don't need soil for their matter.' Teach: 'Plants need minerals from soil (that small 7%), but not for making most of their mass—air and water provide the building blocks.'

Question 6

Scientists found plants are about 93% made of carbon, oxygen, and hydrogen, which come from CO₂ in air and water. Only about 7% comes from soil minerals. This explains how air and water become plant material. What does this evidence support the claim that plants get their matter chiefly from?

  1. mostly from air (CO₂) and water, not mainly from soil (correct answer)
  2. mostly from soil, because soil minerals make up most plant mass
  3. mostly from sunlight, water, and air, because sunlight is matter too
  4. mostly from water and soil, because roots absorb both materials
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, and 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 A is correct because it accurately states that plant matter comes mostly from air (CO₂) and water, not mainly from soil, which matches the evidence showing 93% from carbon, oxygen, and hydrogen in CO₂ and water, and only 7% from soil, explaining how air and water become plant material. Choice B fails because it claims soil minerals make up most plant mass when evidence shows only 7% from soil, representing the common misconception that soil is the primary source—but the evidence proves otherwise. To help students understand evidence for air and water as matter sources: Show the percentages: '93% from air and water, only 7% soil— that's the proof!'; discuss how CO₂ atoms become plant parts; watch for intuition like 'air can't be solid,' and return to: 'What does the composition evidence prove?'

Question 7

A sealed terrarium let in only sunlight; the plant still grew for months using trapped air and recycled water, while soil stayed nearly the same. What does this evidence show about the source of plant matter?

  1. mostly from soil, because soil is the only solid material present
  2. mostly from air and water, because they can be reused to build tissues (correct answer)
  3. mostly from sunlight, because light turns directly into plant mass
  4. mostly from water and soil, because air cannot be recycled
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. The sealed terrarium experiment provides unique evidence: with only trapped air and recycled water available (no new inputs), the plant still grew for months while soil stayed nearly the same—proving the plant built new matter from air and water, not soil. If soil were the main source, it would have decreased as the plant grew, but it didn't. Choice B is correct because it states plant matter comes mostly from air and water, because they can be reused to build tissues, which matches what the evidence demonstrates—the plant grew using only the trapped air and recycled water. Choice A fails because it claims matter comes mostly from soil as the only solid material, when the evidence shows soil mass stayed nearly the same while the plant grew; this represents the misconception that only solid materials can provide mass. To help students understand terrarium evidence: Explain the closed system: 'Nothing new could get in—no fresh air, no new water, no added soil. Yet the plant grew!' Ask the key question: 'If the plant got bigger but the soil stayed the same, where did the new plant matter come from? It must be the air and water inside!' Emphasize recycling: 'The plant used CO₂ from air and water over and over to build new tissues—that's why it could keep growing.' Connect to conservation of mass: 'Matter can't appear from nowhere—it came from the air and water molecules being rearranged into plant molecules.'

Question 8

In Van Helmont's test, soil weight stayed almost the same while the tree got much heavier. What does this experiment show?

  1. mostly from air and water, not mostly from soil (correct answer)
  2. mostly from soil, because soil holds the tree up
  3. mostly from water and soil, because air has no mass
  4. the evidence is not conclusive about plant matter
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 Van Helmont's experimental evidence to support the claim that plants get materials chiefly from air and water, not soil. Van Helmont's experiment provides clear quantitative evidence: while the tree became much heavier (gaining mass), the soil weight stayed almost the same (losing minimal mass). If the tree's new mass came from soil, the soil would have lost an amount equal to what the tree gained—but it didn't, proving the mass came from elsewhere: air and water. Choice A is correct because it accurately states that plant matter comes mostly from air and water, not mostly from soil, which Van Helmont's evidence clearly demonstrates through the dramatic difference between tree mass gain and soil mass loss. Choice C fails because it claims 'air has no mass,' but the evidence proves otherwise—the tree's mass had to come from somewhere, and since it wasn't soil, it must be from air (CO₂ has mass) and water. To help students grasp this evidence: Use a balance scale analogy—'If you move 100 marbles from one side to the other, what happens to each side's weight?' Apply this to Van Helmont: 'If the tree took its mass from soil, the soil would lose what the tree gained. Did that happen? No—so the mass came from air and water instead.'

Question 9

Two bean plants grew for 4 weeks: Plant A in soil grew 12 inches, and Plant B in water with dissolved minerals (no soil) grew 11 inches and stayed healthy. The data demonstrate plants can grow without soil. Based on this evidence, where does most plant matter come from?

  1. mostly from soil, because soil is needed to make plant cells
  2. mostly from water only, because the plant in water still grew
  3. mostly from air and water, with small amounts from minerals (correct answer)
  4. equally from air, water, and soil, because both plants grew
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, and 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 and water, with small amounts from minerals, which matches the hydroponic evidence where Plant B grew nearly as well without soil, showing soil is not the main source of plant matter. 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 them planted in it—but the evidence proves otherwise. To help students understand evidence for air and water as matter sources: Use hydroponics as modern evidence: 'If plants got matter from soil, they couldn't grow without it, but they can—proving matter comes mainly from air and water'; emphasize: 'The plant in water with minerals grew healthy, so soil isn't needed for most mass'; teach that invisible gases like CO₂ have mass and become solid plant matter, and always ask: 'What do experiments prove?'

Question 10

In a sealed terrarium, a plant kept growing for months with sunlight, recycled water, and trapped air, while only a small amount of minerals was in the soil. The plant still made new leaves and stems. What does this evidence show about where most plant matter comes from?

  1. mostly from soil, because the plant is planted in soil
  2. mostly from air and water, while soil minerals are a small part (correct answer)
  3. mostly from sunlight, because sunlight is the only new input
  4. equally from air, water, and soil, because all are recycled
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, and 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 B is correct because it accurately states that plant matter comes mostly from air and water, while soil minerals are a small part, which matches the terrarium evidence where the plant grew with recycled air and water but limited soil minerals, showing air and water provide most mass. Choice A fails because it claims soil is the main source when the evidence shows growth with minimal soil, representing the common misconception that planting in soil means matter comes from it—but the evidence proves otherwise. To help students understand evidence for air and water as matter sources: Describe the terrarium: 'Plant grew with trapped air and recycled water, small minerals—proving air and water build most mass'; emphasize: 'If soil were main, growth would stop when minerals run low, but it didn't'; teach that gases have mass, and ask: 'What does this closed system prove?'

Question 11

A class used the photosynthesis idea: plants take in carbon dioxide from air and water, then make sugars that build leaves, stems, and roots, while oxygen is released. This explains how air and water become plant material. Based on the evidence, plant matter comes mostly from what sources?

  1. mostly from air (CO₂) and water, with only a little from soil (correct answer)
  2. mostly from soil, because soil turns directly into plant tissue
  3. mostly from sunlight, because sunlight becomes the plant's matter
  4. mostly from water and soil, because roots absorb both materials
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, and 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 A is correct because it accurately states that plant matter comes mostly from air (CO₂) and water, with only a little from soil, which matches the photosynthesis evidence where plants use CO₂ and water to make sugars that build plant parts, showing air and water become plant material. Choice B fails because it claims soil turns directly into plant tissue when the evidence shows air and water are the chief sources, representing the common misconception that soil is the main matter source—but the evidence proves otherwise. To help students understand evidence for air and water as matter sources: Explain photosynthesis simply: 'Plants take CO₂ from air and water, make sugars—that's how air and water become leaves and stems'; use visuals to show atoms from CO₂ and H₂O forming plant molecules; emphasize evidence over intuition, asking: 'What do the processes prove?'

Question 12

A student thinks plants are made mostly from soil because roots grow in dirt. But evidence shows soil mass barely changes as plants gain lots of mass, and plant dry mass is mostly carbon, oxygen, and hydrogen from CO₂ and water. Based on the evidence, where does most plant matter come from?

  1. mostly from soil, because soil is the plant's main food source
  2. mostly from air and water, with only small amounts from soil (correct answer)
  3. mostly from water and soil, because air does not add mass
  4. mostly from the plant itself, because it makes matter from nothing
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, and 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 B is correct because it accurately states that plant matter comes mostly from air and water, with only small amounts from soil, which matches the evidence that soil mass barely changes while plants gain mass, and composition is mostly from CO₂ and water, countering the student's misconception. Choice A fails because it claims soil is the main source despite evidence of minimal soil change and 93% from air/water, representing the common misconception that roots in dirt mean matter from soil—but the evidence proves otherwise. To help students understand evidence for air and water as matter sources: Address misconceptions directly: 'Student thinks soil because of roots, but evidence shows soil doesn't decrease much'; present Van Helmont and composition: 'Mass gain from air/water, not soil'; emphasize evidence over intuition, asking: 'What do experiments and numbers prove?'

Question 13

Scientists found plants are mostly carbon, hydrogen, and oxygen (about 93%), which come from CO₂ in air and water, while only about 7% comes from minerals in soil. Based on the evidence, plant matter comes chiefly from what?

  1. chiefly from air and water, with only small amounts from soil minerals (correct answer)
  2. chiefly from minerals in soil, because minerals are the largest part
  3. chiefly from soil and water, because air does not contain matter
  4. chiefly from air, because water is only used to carry minerals
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. The chemical composition evidence is definitive: plants are about 93% carbon, hydrogen, and oxygen (which come from CO₂ in air and water) and only about 7% minerals from soil—this proves mathematically that air and water are the chief sources of plant matter. The 93% to 7% ratio makes it clear which sources are primary. Choice A is correct because it states plant matter comes chiefly from air and water, with only small amounts from soil minerals, which precisely matches the 93% versus 7% evidence. Choice B fails because it claims minerals from soil are the largest part when the evidence shows minerals are only 7%; this represents the misconception that because minerals are important for plant health, they must make up most of plant mass. To help students understand percentage evidence: Make it visual: 'Imagine 100 marbles representing a plant—93 would be from air and water, only 7 from soil. Which is the chief source?' Emphasize the word 'chiefly': 'Chiefly means mainly or mostly—93% is definitely the main part!' Connect elements to sources: 'Carbon (45%) comes from CO₂ in air, hydrogen (6%) and oxygen (42%) come from water and CO₂—that's your 93%.' Address the misconception: 'Yes, minerals are important for plant health, but they're only 7% of the actual mass—like vitamins are important for humans but don't make up most of our body weight.'

Question 14

Scientists analyzed plants and found dry plant matter is about 45% carbon (from CO₂ in air), 42% oxygen (from water and CO₂), and 6% hydrogen (from water), about 93% total from air and water. Only about 7% comes from soil minerals. What does this evidence show about plant matter?

  1. mostly from air and water, with only a small part from soil (correct answer)
  2. mostly from soil minerals, because plants grow in dirt
  3. equally from air, water, and soil, since all are needed
  4. mostly from water and soil, because roots absorb both
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, and 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 A is correct because it accurately states that plant matter comes mostly from air and water, with only a small part from soil, which matches the chemical analysis evidence showing 93% from air and water and only 7% from soil minerals, demonstrating that evidence can prove where materials come from even when we can't see it happening. Choice B fails because it claims soil minerals are the main source when the evidence shows only 7% comes from soil, representing the common misconception that plants get their matter from soil because they grow in dirt—but the evidence proves otherwise. To help students understand evidence for air and water as matter sources: 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!'; do the math together: 'If plants were mostly soil, soil would disappear as plants grow, but it doesn't'; watch for students trusting intuition over evidence, and always return to: 'What do the numbers show?'

Question 15

In Van Helmonts results, the tree gained 164 lb but the soil lost only 0.1 lb. What does this evidence show about soil as the main source?

  1. soil provided most new plant matter
  2. soil and air provided equal plant matter
  3. air and water provided most plant matter, not soil (correct answer)
  4. the evidence does not show where matter came from
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 air and water provided most plant matter, not soil, which matches what the evidence demonstrates—the tree gained 164 lb but soil lost only 0.1 lb, showing soil can't be the main source. Choice A fails because it claims soil provided most new matter when the evidence shows soil mass barely changed, 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 16

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 17

Plant composition data show 45% carbon from CO, 42% oxygen, and 6% hydrogen from water. What does this evidence show about plant matter sources?

  1. mostly from air (CO) and water, with little from soil (correct answer)
  2. mostly from soil, because roots absorb dirt
  3. equally from air, water, and soil
  4. entirely from water, not from air
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 A is correct because it accurately states that plant matter comes mostly from air (CO₂) and water, with little from soil, which matches what the evidence demonstrates—plants are 45% carbon from CO₂, 42% oxygen, and 6% hydrogen from water, totaling about 93% from air and water. Choice B fails because it claims soil is the main source when the evidence shows only about 6-7% from soil minerals, 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

A 100 g dry plant is about 93 g from C, H, and O (air and water) and 7 g from soil minerals. What does this data demonstrate?

  1. mostly from soil minerals, with little from air
  2. equally from air, water, and soil
  3. mostly from air (CO) and water, with little from soil (correct answer)
  4. mostly from water and soil, not air
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, with little from soil, which matches what the evidence demonstrates—a 100 g plant has 93 g from C, H, O in air and water, and only 7 g from soil. Choice B fails because it states sources contribute equally when the evidence shows air and water provide 93% and soil only 7%, 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 19

Photosynthesis uses carbon dioxide from air and water to make sugar that plants build into stems and leaves. What does this evidence show about where plant matter comes from?

  1. mostly from soil, because soil turns directly into plant tissue
  2. mostly from air and water, because they are used to make sugar (correct answer)
  3. mostly from water and soil, because air cannot become solid matter
  4. mostly from sunlight and air, because water is only for cooling
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. The photosynthesis evidence is direct: the process uses carbon dioxide from air and water to make sugar that plants build into stems and leaves—this shows exactly how air and water become plant matter. Photosynthesis literally combines CO₂ and H₂O to create the glucose (C₆H₁₂O₆) that forms plant tissues, proving air and water are the raw materials. Choice B is correct because it accurately states that plant matter comes mostly from air and water, because they are used to make sugar, which matches what the evidence demonstrates—photosynthesis converts air and water into plant material. Choice C fails because it claims air cannot become solid matter when the evidence shows photosynthesis does exactly that—converts gaseous CO₂ into solid plant tissues; this represents the misconception that gases can't become solids. To help students understand photosynthesis evidence: Explain the process simply: 'Plants take invisible CO₂ gas from air and liquid water, combine them to make solid sugar, then build that sugar into stems and leaves.' Show the connection: 'The carbon in wood comes from CO₂ in air, the hydrogen from water—photosynthesis proves where plant matter originates.' Address the key misconception: 'Yes, invisible gas (CO₂) can become solid wood—that's what photosynthesis does!' Use concrete examples: 'A tree trunk is mostly carbon that came from invisible CO₂ in the air.'

Question 20

Plant analysis shows 45% carbon from CO₂ and 48% from water/CO₂. What does this evidence show about plant matter?

  1. mostly from air and water, with little from soil (correct answer)
  2. mostly from minerals in the soil each day
  3. equally from air, water, and soil together
  4. entirely from water, not from air at all
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 chemical composition data to support the claim that plants get materials chiefly from air and water, not soil. Chemical analysis provides powerful evidence: plants are 45% carbon (from CO₂ in air) and 48% hydrogen/oxygen (from water and CO₂), totaling 93% from air and water sources. This leaves only about 7% for minerals from soil, proving that air and water—not soil—are the primary sources of plant matter. Choice A is correct because it accurately states that plant matter comes mostly from air and water, with little from soil, which perfectly matches the 93% vs 7% evidence. Choice B fails because it claims matter comes mostly from soil minerals, but the evidence shows minerals make up only about 7% of plant mass—the opposite of 'mostly.' To help students grasp this evidence: Use a pie chart showing 93% from air/water and 7% from soil—the visual makes the proportions clear. Ask students: 'If you were 93% made of pizza and 7% made of salad, what would you be mostly made of?' This analogy helps them understand that 93% means 'mostly' while 7% means 'a little.'