Elementary School Science Quiz: Trace Matter From Plants To Animals
20 questions · exam conditions
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Trace Matter From Plants To AnimalsQuestion 1 of 20

On a farm, a cow eats grass and hay; how does matter from plants help it grow?

The plant matter turns into energy, so no matter stays in the cow
The plant matter is digested and becomes part of the cow's tissues
The plant matter disappears after the cow consumes it
The cow transfers its matter into the grass while eating
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Elementary School Science Quiz

Elementary School Science Quiz: Trace Matter From Plants To Animals

Practice Trace Matter From Plants To Animals 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 Trace Matter From Plants To Animals, 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

On a farm, a cow eats grass and hay; how does matter from plants help it grow?

  1. The plant matter turns into energy, so no matter stays in the cow
  2. The plant matter is digested and becomes part of the cow's tissues (correct answer)
  3. The plant matter disappears after the cow consumes it
  4. The cow transfers its matter into the grass while eating
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a herbivore eats a plant, the plant's matter (carbohydrates, proteins, fats, minerals) is broken down through digestion into smaller molecules. These molecules are then absorbed and used to build the animal's body tissues (muscles, bones, organs) or broken down further to release energy. Matter is conserved but rearranged - atoms that were once part of the plant become part of the animal. Choice B is correct because it accurately describes how plant matter is digested, transformed, and incorporated into the animal's body structures. This demonstrates understanding that matter flows through ecosystems and is conserved, not created or destroyed. Choice A represents the misconception that matter turns into energy only, which is common because students may focus only on energy flow in food chains, or they don't understand that the substance of plants literally becomes part of animal bodies through molecular rearrangement. To help students: Use visual models showing molecules from plants being broken down and reassembled into animal tissues. Consider using building blocks or LEGO analogy - the blocks (atoms) don't disappear; they're just rearranged into new structures. Track a specific atom (like carbon or nitrogen) from plant to animal to make matter transfer concrete. Watch for: students who think matter 'turns into energy' (matter and energy are different), or who don't recognize that animal bodies are literally built from materials that came from consumed organisms.

Question 2

In a forest, a deer eats oak leaves and acorns; how does matter transfer occur?

  1. The deer digests plant matter and rearranges it into body tissues. (correct answer)
  2. Only water from the leaves transfers into the deer.
  3. The oak tree creates new matter that moves into the deer.
  4. The plant matter disappears when the deer consumes it.
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a deer eats oak leaves and acorns, the plant's complex molecules (cellulose, starch, proteins) are broken down through digestion into simpler molecules that can be absorbed and used to build the deer's body tissues like muscles, antlers, and organs. Choice A is correct because it accurately describes how plant matter is digested and rearranged into deer body tissues, demonstrating conservation of matter through transformation. Choice C represents the misconception that new matter is created - this error is common because students may think organisms can create matter from nothing, not understanding that all matter must come from somewhere and is only rearranged. To help students: Track specific atoms (like carbon from an acorn) through digestion and into deer muscle tissue using visual models or molecular diagrams. Watch for students who think organisms can create matter or that matter can be created from energy, and reinforce that matter is always conserved and only rearranged into new forms.

Question 3

In a savanna, a zebra grazes on grass; how does grass matter become zebra matter?

  1. The grass matter disappears after the zebra eats it
  2. The zebra digests grass matter and uses it to build body tissues (correct answer)
  3. Only water from the grass becomes part of the zebra
  4. The grass matter stays exactly the same inside the zebra
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a zebra grazes on grass, the plant matter containing cellulose, proteins, and other nutrients is broken down through digestion into smaller molecules that are absorbed through the intestines and used to build the zebra's body tissues, including its distinctive striped coat and strong muscles. Choice B is correct because it accurately describes how grass matter is digested, transformed, and incorporated into zebra body structures, demonstrating that matter flows through ecosystems and is conserved. Choice C represents the misconception that only water transfers from plants to animals, ignoring that all the solid matter in grass (proteins, carbohydrates, minerals) also becomes part of the zebra's body. To help students: Use building blocks to show how grass molecules are taken apart and rebuilt into zebra tissues - the blocks don't disappear, they're just rearranged. Track a carbon atom from grass cellulose to zebra muscle protein to make the transfer concrete. Watch for students who think only liquids transfer or that solid matter somehow vanishes.

Question 4

In a garden, a caterpillar consumes lettuce leaves; how does plant matter become caterpillar body matter?

  1. The lettuce matter stays exactly the same inside the caterpillar.
  2. The caterpillar digests lettuce matter and uses it to build body parts. (correct answer)
  3. The lettuce gives energy to the caterpillar, but no matter transfers.
  4. The lettuce matter disappears after the caterpillar consumes it.
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a caterpillar eats lettuce, the plant's matter (carbohydrates, proteins, fats, minerals) is broken down through digestion into smaller molecules that are absorbed and used to build the caterpillar's body tissues or broken down further for energy. Choice B is correct because it accurately describes how plant matter is digested, transformed, and incorporated into the caterpillar's body structures, demonstrating that matter flows through ecosystems and is conserved. Choice C represents the misconception that only energy transfers from food, not matter itself - this error is common because students often learn about energy flow first and don't realize that the actual atoms from plants become part of animal bodies. To help students: Use visual models showing lettuce molecules being broken down and reassembled into caterpillar tissues, or use building blocks to show how the same pieces (atoms) get rearranged into new structures. Watch for students who think matter 'turns into energy' or disappears, and emphasize that the caterpillar's body is literally built from rearranged lettuce molecules.

Question 5

In a classroom terrarium, Yuki watches a grasshopper consume lettuce; what happens to the matter?

  1. The lettuce matter disappears after the grasshopper eats it.
  2. The grasshopper digests lettuce matter and uses it to grow larger. (correct answer)
  3. The lettuce gives energy only, so no matter transfers.
  4. The lettuce matter stays exactly the same inside the grasshopper.
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a grasshopper consumes lettuce, the plant's matter is broken down through digestion into smaller molecules that are absorbed and used to build new grasshopper tissues, allowing it to grow larger. Choice B is correct because it accurately describes how lettuce matter is digested and used for growth, showing that the grasshopper's increased size comes from incorporating plant matter into its body. Choice C represents the misconception that only energy transfers from food - this error is common because students often learn about energy transfer first and don't realize that the physical substance of food literally becomes part of the consumer's body. To help students: Have them observe and measure grasshopper growth over time while tracking food consumption, making the connection that increased body mass must come from somewhere (the lettuce). Watch for students who think growth happens without adding matter or who separate energy from matter in their thinking about food chains.

Question 6

In a garden, a rabbit eats lettuce leaves; what happens to the lettuce's matter?

  1. The rabbit digests lettuce matter and uses it to build body tissues. (correct answer)
  2. The lettuce matter stays exactly the same inside the rabbit.
  3. The lettuce gives energy only, so no matter transfers.
  4. All the lettuce matter becomes waste and is released by the rabbit.
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a rabbit eats lettuce leaves, the plant's matter (cellulose, proteins, vitamins, minerals) is broken down through digestion into smaller molecules that are absorbed and used to build the rabbit's body tissues. Choice A is correct because it accurately describes how lettuce matter is digested and incorporated into rabbit body structures, demonstrating conservation of matter through transformation. Choice D represents a partial misconception - while some matter does become waste, a significant portion is absorbed and used to build and maintain the rabbit's body; if all matter became waste, the rabbit couldn't grow or maintain its tissues. To help students: Use a flow diagram showing lettuce matter being divided into two paths - some becoming rabbit tissue and some becoming waste - to show that both processes occur but growth requires incorporating matter. Watch for students who think all food becomes waste or who don't understand that growth and body maintenance require incorporating matter from food.

Question 7

On a farm, a cow eats grass and hay; what happens to the plant's matter?

  1. The cow digests plant matter and uses it to build tissues and milk. (correct answer)
  2. The cow transfers matter to the grass through chewing.
  3. The plant matter is completely destroyed to make energy.
  4. The plant matter stays unchanged inside the cow's stomach.
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies and products (NGSS 5-LS2-1). When a cow eats grass and hay, the plant matter is broken down through digestion into smaller molecules (sugars, amino acids, fatty acids) that are absorbed and used to build the cow's tissues, including muscle, bone, and milk proteins. Choice A is correct because it accurately describes how plant matter is digested and incorporated into both body tissues and milk production, showing that matter is conserved and rearranged. Choice C represents the misconception that matter is 'destroyed' to make energy - this error occurs because students confuse matter transformation with destruction, not understanding that atoms are rearranged but never disappear. To help students: Use diagrams showing grass molecules being broken down and rebuilt into cow tissues and milk molecules, emphasizing that the same carbon, nitrogen, and other atoms are just rearranged. Watch for students who think energy and matter are the same thing, or who believe that making energy requires destroying matter rather than breaking chemical bonds.

Question 8

In a meadow, a grasshopper eats grass stems; which explains how matter is conserved?

  1. The grass matter is digested and rearranged into the grasshopper's body (correct answer)
  2. The grass matter disappears when the grasshopper consumes it
  3. Only energy transfers from the grass to the grasshopper, not matter
  4. The grass matter moves into the grasshopper without being changed
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a grasshopper consumes grass stems, the plant matter is broken down during digestion into smaller molecules that are absorbed and reorganized to form the grasshopper's exoskeleton, wings, and other tissues, or metabolized for energy, ensuring matter conservation as atoms are rearranged. Choice A is correct because it describes the digestion and rearrangement of grass matter into the grasshopper's body, emphasizing how matter is conserved in meadow ecosystems. Choice C represents the misconception that only energy transfers, not matter, which arises from focusing solely on energy pyramids and neglecting matter's physical transfer and transformation. To help students, use interactive simulations or bead models to show molecules disassembling from grass and reassembling in the grasshopper, tracking elements like phosphorus. Watch for ideas that matter disappears, indicating a need to reinforce that all matter in animal growth originates from consumed sources through conservation principles.

Question 9

In a classroom terrarium, Yuki observes a rabbit eating lettuce; what happens to lettuce matter?

  1. The lettuce gives energy only, and no matter transfers to the rabbit
  2. The lettuce matter is digested and becomes part of the rabbit's body (correct answer)
  3. The lettuce matter disappears when the rabbit consumes it
  4. The rabbit transfers matter into the lettuce during eating
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a herbivore eats a plant, the plant's matter (carbohydrates, proteins, fats, minerals) is broken down through digestion into smaller molecules. These molecules are then absorbed and used to build the animal's body tissues (muscles, bones, organs) or broken down further to release energy. Matter is conserved but rearranged - atoms that were once part of the plant become part of the animal. Choice B is correct because it accurately describes how plant matter is digested, transformed, and incorporated into the animal's body structures. This demonstrates understanding that matter flows through ecosystems and is conserved, not created or destroyed. Choice A represents the misconception that matter provides energy only with no transfer, which is common because students may focus only on energy flow in food chains, or they don't understand that the substance of plants literally becomes part of animal bodies through molecular rearrangement. To help students: Use visual models showing molecules from plants being broken down and reassembled into animal tissues. Consider using building blocks or LEGO analogy - the blocks (atoms) don't disappear; they're just rearranged into new structures. Track a specific atom (like carbon or nitrogen) from plant to animal to make matter transfer concrete. Watch for: students who think matter 'turns into energy' (matter and energy are different), or who don't recognize that animal bodies are literally built from materials that came from consumed organisms.

Question 10

On a farm, a cow eats grass and hay; what happens to the plant matter?

  1. The cow digests plant matter and uses it to build body tissues (correct answer)
  2. The plant matter is completely destroyed to make energy
  3. The cow transfers its matter to the grass during eating
  4. Only water from the grass becomes part of the cow
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a cow eats grass and hay, the plant matter containing carbohydrates, proteins, and other nutrients is broken down through digestion into smaller molecules that are absorbed through the intestines and used to build the cow's muscles, bones, and other tissues. Choice A is correct because it accurately describes how plant matter is digested and incorporated into the cow's body structures, demonstrating conservation of matter. Choice B represents the misconception that matter is destroyed to make energy - this confuses matter with energy and violates conservation of matter, as atoms cannot be destroyed in biological processes. To help students: Use a building block analogy where grass molecules are like LEGO pieces that get taken apart and rebuilt into cow tissues. Track specific atoms like carbon from grass to cow muscle to make the transfer concrete. Watch for students who think matter 'turns into' energy or disappears, and emphasize that matter and energy are different - matter is rearranged but conserved.

Question 11

On a farm, a horse consumes corn and grass; how does plant matter become horse matter?

  1. Only water from the plants transfers into the horse.
  2. The horse digests plant matter and uses it to build muscles and bones. (correct answer)
  3. The plant matter disappears when the horse consumes it.
  4. The plant matter stays unchanged inside the horse.
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a horse consumes corn and grass, the plant matter (starches, proteins, cellulose) is broken down through digestion into smaller molecules that are absorbed and used to build the horse's muscles, bones, and other tissues. Choice B is correct because it accurately describes how plant matter is digested and incorporated into horse body structures, showing that the horse's large muscles and strong bones are literally built from rearranged plant molecules. Choice A represents the misconception that only water transfers from plants - this error occurs because students may focus on the water content of plants without understanding that all the solid matter (carbohydrates, proteins, minerals) also transfers and becomes part of the animal. To help students: Use visual models showing corn and grass molecules being broken down and rebuilt into horse muscle and bone tissue, emphasizing that it takes many pounds of plant matter to build one pound of horse tissue. Watch for students who think only certain parts of food (like water or vitamins) transfer, not understanding that all matter is conserved and transferred.

Question 12

In a meadow, a rabbit eats grass; how does grass matter become rabbit matter?

  1. The rabbit digests grass matter and uses it to build muscles and organs. (correct answer)
  2. The grass matter moves into the rabbit without being changed.
  3. The rabbit gets energy from grass, but no matter transfers.
  4. All the grass matter becomes waste and is released from the rabbit.
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a rabbit eats grass, the plant's matter (cellulose, proteins, minerals) is broken down through digestion into smaller molecules that are absorbed through the intestines and used to build the rabbit's muscles, organs, fur, and bones. Choice A is correct because it accurately describes how grass matter is digested and incorporated into rabbit body structures, showing that matter flows through the food chain and is conserved. Choice D represents a partial misconception - while some matter does become waste, not all of it does; much is incorporated into the rabbit's body for growth and maintenance. To help students: Use a diagram showing grass molecules being broken apart and reassembled into rabbit tissue molecules, emphasizing that the same atoms are rearranged into new structures. Watch for students who think all consumed matter becomes waste or who don't understand that animal bodies are literally built from the rearranged atoms of their food.

Question 13

Based on the diagram: Corn plant → Deer. When the deer eats corn, what happens to matter?

  1. The corn matter is digested and becomes part of the deer's body (correct answer)
  2. The corn matter disappears when the deer consumes it
  3. The deer transfers matter to the corn plant during eating
  4. Only energy transfers from corn to the deer, not matter
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). In the diagram where a deer eats corn, the plant matter is digested, converting complex molecules into simpler ones that are absorbed and rebuilt into the deer's antlers, muscles, and other structures, or for energy, conserving matter through atomic rearrangement. Choice A is correct because it accurately depicts how corn matter is digested and integrated into the deer's body, reinforcing matter conservation in food chain diagrams. Choice B represents the misconception that matter disappears upon consumption, common when students overlook that atoms from food persist and form new tissues in the consumer. To help students, use labeled diagrams or atom-tracking worksheets to visualize elements moving from corn to deer, analogous to reassembling toy blocks. Watch for directional errors like animals transferring matter to plants, which confuses the unidirectional flow of matter in consumption-based chains.

Question 14

Look at the food chain: Grass → Rabbit. When the rabbit eats grass, what happens to the grass's matter?

  1. The grass matter disappears after the rabbit consumes it
  2. The grass matter is digested and becomes part of the rabbit's body (correct answer)
  3. The grass gives energy only, and no matter transfers to the rabbit
  4. The rabbit transfers its matter into the grass during eating
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a herbivore eats a plant, the plant's matter (carbohydrates, proteins, fats, minerals) is broken down through digestion into smaller molecules. These molecules are then absorbed and used to build the animal's body tissues (muscles, bones, organs) or broken down further to release energy. Matter is conserved but rearranged - atoms that were once part of the plant become part of the animal. Choice B is correct because it accurately describes how plant matter is digested, transformed, and incorporated into the animal's body structures. This demonstrates understanding that matter flows through ecosystems and is conserved, not created or destroyed. Choice A represents the misconception that matter disappears, which is common because students may focus only on energy flow in food chains, or they don't understand that the substance of plants literally becomes part of animal bodies through molecular rearrangement. To help students: Use visual models showing molecules from plants being broken down and reassembled into animal tissues. Consider using building blocks or LEGO analogy - the blocks (atoms) don't disappear; they're just rearranged into new structures. Track a specific atom (like carbon or nitrogen) from plant to animal to make matter transfer concrete. Watch for: students who think matter 'turns into energy' (matter and energy are different), or who don't recognize that animal bodies are literally built from materials that came from consumed organisms.

Question 15

In a meadow food chain: Wheat → Grasshopper. When the grasshopper eats wheat, what happens to wheat matter?

  1. The wheat matter is digested and used to build grasshopper tissues (correct answer)
  2. The wheat matter disappears after the grasshopper consumes it
  3. The wheat gives energy only, and no matter transfers
  4. The grasshopper transfers its matter into the wheat while eating
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a herbivore eats a plant, the plant's matter (carbohydrates, proteins, fats, minerals) is broken down through digestion into smaller molecules. These molecules are then absorbed and used to build the animal's body tissues (muscles, bones, organs) or broken down further to release energy. Matter is conserved but rearranged - atoms that were once part of the plant become part of the animal. Choice A is correct because it accurately describes how plant matter is digested, transformed, and incorporated into the animal's body structures. This demonstrates understanding that matter flows through ecosystems and is conserved, not created or destroyed. Choice C represents the misconception that matter provides energy only with no transfer, which is common because students may focus only on energy flow in food chains, or they don't understand that the substance of plants literally becomes part of animal bodies through molecular rearrangement. To help students: Use visual models showing molecules from plants being broken down and reassembled into animal tissues. Consider using building blocks or LEGO analogy - the blocks (atoms) don't disappear; they're just rearranged into new structures. Track a specific atom (like carbon or nitrogen) from plant to animal to make matter transfer concrete. Watch for: students who think matter 'turns into energy' (matter and energy are different), or who don't recognize that animal bodies are literally built from materials that came from consumed organisms.

Question 16

In a classroom terrarium, Maya observes a rabbit eating lettuce and growing; how did matter move?

  1. The lettuce matter stays exactly the same inside the rabbit
  2. The lettuce matter is digested and becomes part of the rabbit's body (correct answer)
  3. Only energy transfers from the lettuce to the rabbit, not matter
  4. The lettuce matter disappears after the rabbit eats it
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). As a rabbit eats lettuce in a terrarium, the plant matter's carbohydrates, proteins, fats, and minerals are digested into absorbable forms that are then incorporated into the rabbit's growing body, such as fur and organs, or used for energy, with atoms conserved and rearranged in the process. Choice B is correct because it explains how lettuce matter is digested and becomes part of the rabbit, showing matter movement and conservation in controlled ecosystems. Choice D represents the misconception that matter disappears after eating, often due to students not connecting visible growth to invisible molecular transfers from plants. To help students, create observation journals with diagrams tracing carbon from lettuce to rabbit muscles, or use a recycling analogy where materials are repurposed without waste. Watch for confusion between matter and energy, where students might think growth comes from energy alone, missing matter's role in building tissues.

Question 17

In a garden, a caterpillar consumes lettuce leaves; what happens to the lettuce's matter?

  1. The lettuce matter is digested and becomes part of the caterpillar's body (correct answer)
  2. The lettuce matter stays exactly the same inside the caterpillar
  3. The lettuce matter disappears when the caterpillar consumes it
  4. Only water from the lettuce transfers into the caterpillar
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a caterpillar eats lettuce, the plant's matter, composed of carbohydrates, proteins, fats, and minerals, is digested into smaller molecules that are absorbed and used to construct the caterpillar's body tissues like exoskeleton and muscles, or metabolized for energy, with matter conserved as atoms are rearranged from plant to animal forms. Choice A is correct because it explains how lettuce matter is digested and integrated into the caterpillar's body, illustrating the principle of matter conservation in ecosystems. Choice C represents the misconception that matter disappears upon consumption, often arising because students focus on visible changes and overlook that atoms persist and are reused in new molecular structures. To help students, employ concrete analogies such as tracing a carbon atom from lettuce to caterpillar tissues using animations, or building block models to show rearrangement without loss. Watch for confusion where students believe only energy transfers, ignoring that matter from plants literally becomes the building blocks of animal growth.

Question 18

In a bamboo forest, a panda consumes bamboo stems; how does matter move to the panda?

  1. The panda digests bamboo matter and uses it to build body tissues. (correct answer)
  2. The bamboo matter moves into the panda without being changed.
  3. The panda transfers matter to the bamboo while chewing.
  4. The bamboo matter is completely destroyed to make energy.
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a panda consumes bamboo stems, the plant's tough cellulose and other molecules are broken down through specialized digestion into smaller molecules that are absorbed and used to build the panda's body tissues. Choice A is correct because it accurately describes how bamboo matter is digested and incorporated into panda body structures, despite bamboo being difficult to digest. Choice D represents the misconception that matter is 'completely destroyed' to make energy - this error occurs because students don't understand that while chemical bonds are broken to release energy, the atoms themselves are conserved and rearranged into new molecules. To help students: Use diagrams showing how even tough plant materials like bamboo are broken down into usable molecules, emphasizing that pandas have special adaptations for this process but the principle of matter conservation still applies. Watch for students who think difficult-to-digest foods work differently than easy-to-digest foods in terms of matter transfer.

Question 19

In a garden, a caterpillar consumes lettuce leaves; how does plant matter become caterpillar matter?

  1. The lettuce matter is digested and used to build the caterpillar's body (correct answer)
  2. The lettuce matter stays exactly the same inside the caterpillar
  3. The lettuce matter is completely destroyed to make energy only
  4. Only water from the lettuce transfers into the caterpillar
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a herbivore eats a plant, the plant's matter (carbohydrates, proteins, fats, minerals) is broken down through digestion into smaller molecules. These molecules are then absorbed and used to build the animal's body tissues (muscles, bones, organs) or broken down further to release energy. Matter is conserved but rearranged - atoms that were once part of the plant become part of the animal. Choice A is correct because it accurately describes how plant matter is digested, transformed, and incorporated into the animal's body structures. This demonstrates understanding that matter flows through ecosystems and is conserved, not created or destroyed. Choice C represents the misconception that matter is destroyed for energy, which is common because students may focus only on energy flow in food chains, or they don't understand that the substance of plants literally becomes part of animal bodies through molecular rearrangement. To help students: Use visual models showing molecules from plants being broken down and reassembled into animal tissues. Consider using building blocks or LEGO analogy - the blocks (atoms) don't disappear; they're just rearranged into new structures. Track a specific atom (like carbon or nitrogen) from plant to animal to make matter transfer concrete. Watch for: students who think matter 'turns into energy' (matter and energy are different), or who don't recognize that animal bodies are literally built from materials that came from consumed organisms.

Question 20

Look at the food chain: Grass → Rabbit. When the rabbit eats grass, what happens to the grass's matter?​

  1. The grass matter disappears after the rabbit consumes it
  2. The grass matter is digested and becomes part of the rabbit's body (correct answer)
  3. The grass gives energy only, and no matter transfers to the rabbit
  4. The rabbit transfers its matter into the grass during eating
Explanation: This question tests students' understanding of matter transfer in food chains, specifically how plant matter becomes part of animal bodies (NGSS 5-LS2-1). When a herbivore eats a plant, the plant's matter (carbohydrates, proteins, fats, minerals) is broken down through digestion into smaller molecules. These molecules are then absorbed and used to build the animal's body tissues (muscles, bones, organs) or broken down further to release energy. Matter is conserved but rearranged - atoms that were once part of the plant become part of the animal. Choice B is correct because it accurately describes how plant matter is digested, transformed, and incorporated into the animal's body structures. This demonstrates understanding that matter flows through ecosystems and is conserved, not created or destroyed. Choice A represents the misconception that matter disappears, which is common because students may focus only on energy flow in food chains, or they don't understand that the substance of plants literally becomes part of animal bodies through molecular rearrangement. To help students: Use visual models showing molecules from plants being broken down and reassembled into animal tissues. Consider using building blocks or LEGO analogy - the blocks (atoms) don't disappear; they're just rearranged into new structures. Track a specific atom (like carbon or nitrogen) from plant to animal to make matter transfer concrete. Watch for: students who think matter 'turns into energy' (matter and energy are different), or who don't recognize that animal bodies are literally built from materials that came from consumed organisms.