5th Grade Science Quiz: Identify Materials Plants Need
20 questions · exam conditions
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Identify Materials Plants NeedQuestion 1 of 20

A maple tree grew from 2 pounds to 500 pounds; where did most new plant material come from?

mostly from soil particles that the tree absorbs
mostly from fertilizer nutrients added to the soil
mainly from water and carbon dioxide in the air
mainly from minerals and dirt taken up by roots
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5th Grade Science Quiz

5th Grade Science Quiz: Identify Materials Plants Need

Practice Identify Materials Plants Need 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 Identify Materials Plants Need, 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

A maple tree grew from 2 pounds to 500 pounds; where did most new plant material come from?

  1. mostly from soil particles that the tree absorbs
  2. mostly from fertilizer nutrients added to the soil
  3. mainly from water and carbon dioxide in the air (correct answer)
  4. mainly from minerals and dirt taken up by roots
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. Plants need several things to grow, but it's important to distinguish materials (what the plant is made of) from energy (what powers the process). The main MATERIALS plants need are: (1) Water (H₂O)—absorbed through roots from the soil, provides hydrogen and oxygen atoms. (2) Carbon dioxide (CO₂)—absorbed through tiny holes in leaves from the air, provides carbon atoms. These two materials—water and air—provide the carbon, hydrogen, and oxygen that make up most of the plant's mass (wood, leaves, roots, fruits). Plants also need (3) Sunlight—but sunlight provides ENERGY for photosynthesis, not material for building plant tissues. (4) Minerals from soil—nitrogen, phosphorus, potassium, and others—but plants need these in small amounts; they don't provide the bulk of the plant's mass. The key point: Most plant matter (about 95%) comes from water and air, not from soil. Choice C is correct because it identifies water and carbon dioxide from air (or air and water) as the main materials, which is accurate—these provide the carbon, hydrogen, and oxygen atoms that make up most of the plant's mass. The answer may also mention sunlight (for energy) and minerals (small amounts), but it correctly emphasizes water and air as the chief sources of plant material. Choice A fails because it claims soil is the main source of materials, when soil provides only minerals in small amounts. This is a very common misconception—people see plants growing in soil and assume the soil provides the material for growth, but actually most plant mass comes from invisible gases in the air (carbon dioxide) and water. To help students understand where plant materials come from: Do the 'where did the tree's mass come from?' thought experiment. A tiny tree seedling weighs 2 pounds. Ten years later, the tree weighs 500 pounds. Where did the 498 pounds come from? Students often say 'soil,' but if that were true, there would be a huge hole in the ground where the soil was consumed. The soil weighs about the same! The mass came from water (absorbed from soil) and carbon dioxide (from air). Use the equation: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Show that the inputs (CO₂ and H₂O) provide all the carbon, hydrogen, and oxygen in the output sugar. Compare: Materials (water and air) vs Energy (sunlight) vs Minerals (small amounts from soil). Ask: 'What is the plant made of? Carbon, hydrogen, oxygen. Where do these come from? Carbon from air (CO₂), hydrogen and oxygen from water (H₂O).' Point to hydroponics as proof—plants can grow without soil at all, with minerals dissolved in water. Watch for: Students who think soil is consumed for plant growth, or who think sunlight is a material. Always reinforce: Most plant mass from air and water, not soil.

Question 2

A student says, "Plants grow because they eat soil." But a plant's mass is mostly made from water and carbon dioxide, while minerals are needed in small amounts. Which of these provides the main materials for plant growth?

  1. Mostly soil turned into plant body, plus water and minerals
  2. Water and carbon dioxide from air, with small soil minerals (correct answer)
  3. Sunlight and minerals, because light becomes plant matter
  4. Fertilizer and soil nutrients, with a little water and air
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. The question directly addresses the common misconception that 'plants eat soil' by stating the scientific fact that 'a plant's mass is mostly made from water and carbon dioxide, while minerals are needed in small amounts.' This is accurate—about 95% of a plant's dry mass comes from carbon (from CO₂) and hydrogen/oxygen (from H₂O), while minerals make up only about 5%. Choice B is correct because it identifies water and carbon dioxide from air as the main materials, with small soil minerals, which aligns with the scientific explanation given in the question and reflects how photosynthesis actually builds plant tissues. Choice A fails because it claims soil is turned into plant body and is mostly consumed, perpetuating the exact misconception the question is trying to correct—if plants ate soil, there would be huge holes around every tree. To help students overcome this misconception: Do a thought experiment: 'If a 500-pound tree ate soil to grow, how much soil would disappear? Would there be a crater?' Show that soil levels don't drop significantly around plants. Demonstrate with data: A large tree might contain 5 pounds of minerals but 495 pounds of carbon, hydrogen, and oxygen from water and air. Use molecular models to show that glucose (C₆H₁₂O₆) is made entirely from atoms found in CO₂ and H₂O, not from soil. This helps students see that plants are literally built from air and water, not from eating soil.

Question 3

A tomato plant grows new leaves using water from roots and carbon dioxide from air; which materials are essential for plant growth?

  1. mostly soil turned into plant matter, plus water
  2. water and carbon dioxide from air, plus minerals (correct answer)
  3. sunlight, water, and soil as the main materials
  4. minerals from soil alone, without water or air
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. Plants need several things to grow, but it's important to distinguish materials (what the plant is made of) from energy (what powers the process). The main MATERIALS plants need are: (1) Water (H₂O)—absorbed through roots from the soil, provides hydrogen and oxygen atoms. (2) Carbon dioxide (CO₂)—absorbed through tiny holes in leaves from the air, provides carbon atoms. These two materials—water and air—provide the carbon, hydrogen, and oxygen that make up most of the plant's mass (wood, leaves, roots, fruits). Plants also need (3) Sunlight—but sunlight provides ENERGY for photosynthesis, not material for building plant tissues. (4) Minerals from soil—nitrogen, phosphorus, potassium, and others—but plants need these in small amounts; they don't provide the bulk of the plant's mass. The key point: Most plant matter (about 95%) comes from water and air, not from soil. Choice B is correct because it identifies water and carbon dioxide from air (or air and water) as the main materials, which is accurate—these provide the carbon, hydrogen, and oxygen atoms that make up most of the plant's mass. The answer may also mention sunlight (for energy) and minerals (small amounts), but it correctly emphasizes water and air as the chief sources of plant material. Choice A fails because it claims soil is the main source of materials, when soil provides only minerals in small amounts. This is a very common misconception—people see plants growing in soil and assume the soil provides the material for growth, but actually most plant mass comes from invisible gases in the air (carbon dioxide) and water. To help students understand where plant materials come from: Do the 'where did the tree's mass come from?' thought experiment. A tiny tree seedling weighs 2 pounds. Ten years later, the tree weighs 500 pounds. Where did the 498 pounds come from? Students often say 'soil,' but if that were true, there would be a huge hole in the ground where the soil was consumed. The soil weighs about the same! The mass came from water (absorbed from soil) and carbon dioxide (from air). Use the equation: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Show that the inputs (CO₂ and H₂O) provide all the carbon, hydrogen, and oxygen in the output sugar. Compare: Materials (water and air) vs Energy (sunlight) vs Minerals (small amounts from soil). Ask: 'What is the plant made of? Carbon, hydrogen, oxygen. Where do these come from? Carbon from air (CO₂), hydrogen and oxygen from water (H₂O).' Point to hydroponics as proof—plants can grow without soil at all, with minerals dissolved in water. Watch for: Students who think soil is consumed for plant growth, or who think sunlight is a material. Always reinforce: Most plant mass from air and water, not soil.

Question 4

Jamal compared two plants: one in rich soil and one in sand; both grew with water and air. Based on the observations, plants need which materials to grow?

  1. water and carbon dioxide from air (correct answer)
  2. water and soil as equal sources
  3. mostly minerals from rich soil
  4. sunlight as the main material
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. Plants need several things to grow, but it's important to distinguish materials (what the plant is made of) from energy (what powers the process). The main MATERIALS plants need are: (1) Water (H₂O)—absorbed through roots from the soil, provides hydrogen and oxygen atoms. (2) Carbon dioxide (CO₂)—absorbed through tiny holes in leaves from the air, provides carbon atoms. These two materials—water and air—provide the carbon, hydrogen, and oxygen that make up most of the plant's mass (wood, leaves, roots, fruits). Plants also need (3) Sunlight—but sunlight provides ENERGY for photosynthesis, not material for building plant tissues. (4) Minerals from soil—nitrogen, phosphorus, potassium, and others—but plants need these in small amounts; they don't provide the bulk of the plant's mass. The key point: Most plant matter (about 95%) comes from water and air, not from soil. Choice A is correct because it identifies water and carbon dioxide from air as the main materials, matching Jamal's observation that both plants grew with water and air, regardless of soil type, emphasizing these as chief sources. Choice C fails because it claims mostly minerals from rich soil, when minerals are minor and Jamal's sand plant still grew, showing soil isn't the main source. To help students understand where plant materials come from: Do the 'where did the tree's mass come from?' thought experiment. A tiny tree seedling weighs 2 pounds. Ten years later, the tree weighs 500 pounds. Where did the 498 pounds come from? Students often say 'soil,' but if that were true, there would be a huge hole in the ground where the soil was consumed. The soil weighs about the same! The mass came from water (absorbed from soil) and carbon dioxide (from air). Use the equation: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Show that the inputs (CO₂ and H₂O) provide all the carbon, hydrogen, and oxygen in the output sugar. Compare: Materials (water and air) vs Energy (sunlight) vs Minerals (small amounts from soil). Ask: 'What is the plant made of? Carbon, hydrogen, oxygen. Where do these come from? Carbon from air (CO₂), hydrogen and oxygen from water (H₂O).' Point to hydroponics as proof—plants can grow without soil at all, with minerals dissolved in water. Watch for: Students who think soil is consumed for plant growth, or who think sunlight is a material. Always reinforce: Most plant mass from air and water, not soil.

Question 5

In hydroponics, plants grow with no soil; based on this, what materials must plants still get?

  1. Water and carbon dioxide from air, plus dissolved minerals (correct answer)
  2. Soil chunks for food, plus water and sunlight
  3. Only minerals, because water and air are not needed
  4. Water and soil, because air is not a plant material
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. Hydroponics provides perfect evidence for what materials plants truly need: plants grow without any soil at all, with roots in nutrient-enriched water. This proves that soil itself is not essential—what matters is water (H₂O), carbon dioxide (CO₂) from air, and dissolved minerals. The water provides hydrogen and oxygen atoms, the CO₂ from air provides carbon atoms, and together these make up about 95% of the plant's mass. Choice A is correct because it identifies water and carbon dioxide from air, plus dissolved minerals—exactly what hydroponic plants use to grow successfully. Choice B fails because it claims plants need soil chunks for food, but hydroponics proves plants don't eat soil—they make their own food from water and CO₂, and soil normally just holds minerals that can be dissolved in water instead. To help students understand: Show pictures of hydroponic farms with huge tomato plants growing in water. Ask: "If plants needed to eat soil, how could these plants grow without it?" Use hydroponics as proof that plants make their own food from water and air. Explain that soil normally provides: (1) support for roots, (2) water storage, and (3) minerals—but in hydroponics, we provide support with other materials, water directly, and minerals dissolved in the water. This demonstrates that the actual materials plants need are water, air, and small amounts of minerals.

Question 6

A model of photosynthesis shows plants use water from roots and carbon dioxide from air to make sugars that become plant tissues. Sunlight provides energy but is not matter. What do plants need to make new plant material?​​

  1. Water and carbon dioxide from air, plus small amounts of minerals (correct answer)
  2. Sunlight and oxygen from air, plus a little water
  3. Soil and minerals as the main material, plus water and air
  4. Only water and soil, because leaves cannot use air as matter
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. The question provides a scientifically accurate model of photosynthesis, explicitly stating that plants use water and carbon dioxide to make sugars that become plant tissues, and correctly identifying that sunlight provides energy but is not matter. This model shows that the carbon, hydrogen, and oxygen atoms in plant tissues come from CO₂ and H₂O, which together provide about 95% of a plant's mass. Choice A is correct because it identifies water and carbon dioxide from air as the main materials needed to make new plant material, plus small amounts of minerals, which perfectly matches the photosynthesis model described—these materials provide the atoms that physically become the plant. Choice B fails because it lists oxygen from air as a material plants need to take in, when actually plants release oxygen as a waste product of photosynthesis—they don't use atmospheric oxygen to build tissues. To help students understand this model: Use the photosynthesis equation 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂ with colored markers. Have students trace where each atom goes: carbon from CO₂ becomes the carbon in sugar, hydrogen from H₂O becomes hydrogen in sugar. Show that 100% of the atoms in glucose come from CO₂ and H₂O. Emphasize the difference: Sunlight powers the reaction (energy) but doesn't become part of the sugar molecule (not matter). This molecular view helps students see that plants are literally assembled from water and air molecules.

Question 7

In hydroponics, a lettuce plant grows with roots in water containing dissolved minerals, but no soil is used. Leaves still take in carbon dioxide from air. Based on this, what materials do plants need to grow?​​

  1. Soil is required, plus water and sunlight for plant food
  2. Water and carbon dioxide from air, plus small dissolved minerals (correct answer)
  3. Only water and minerals, because air is not needed
  4. Sunlight as matter, plus oxygen from air and soil nutrients
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. The hydroponic example is perfect evidence that soil is not essential for plant growth—the lettuce grows with no soil at all, just water with dissolved minerals. The question explicitly states that leaves still take in carbon dioxide from air, highlighting that plants need both water (from roots) and CO₂ (from leaves) as their main materials. These provide the carbon, hydrogen, and oxygen atoms that make up about 95% of the plant's mass. Choice B is correct because it identifies water and carbon dioxide from air as the main materials, plus small dissolved minerals, which exactly matches what the hydroponic system provides—this proves plants don't need soil itself, just the minerals that can be dissolved in water. Choice A fails because it claims soil is required, but the hydroponic lettuce proves this wrong—plants can grow perfectly well without any soil as long as they have water, CO₂, and dissolved minerals. To help students understand this concept: Set up a simple hydroponic demonstration with lettuce or herbs. Show students that plants grow just as well (often better!) without soil. Ask: 'If plants ate soil to grow, could hydroponics work?' No! The fact that hydroponics works proves that plants get their mass from water and air, not from soil. Point out commercial greenhouses often use hydroponics because it's more efficient—you can provide exactly the small amounts of minerals needed without wasting soil. This real-world application reinforces that ~95% of plant mass comes from water and CO₂, not from soil.

Question 8

A young maple tree grew from 2 pounds to 500 pounds over 10 years. The tree got most new material from water and what else?

  1. minerals taken from the soil
  2. carbon dioxide taken from the air (correct answer)
  3. oxygen taken from the air
  4. food absorbed directly from soil
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. Plants need several things to grow, but it's important to distinguish materials (what the plant is made of) from energy (what powers the process). The main MATERIALS plants need are: (1) Water (H₂O)—absorbed through roots from the soil, provides hydrogen and oxygen atoms. (2) Carbon dioxide (CO₂)—absorbed through tiny holes in leaves from the air, provides carbon atoms. These two materials—water and air—provide the carbon, hydrogen, and oxygen that make up most of the plant's mass (wood, leaves, roots, fruits). Plants also need (3) Sunlight—but sunlight provides ENERGY for photosynthesis, not material for building plant tissues. (4) Minerals from soil—nitrogen, phosphorus, potassium, and others—but plants need these in small amounts; they don't provide the bulk of the plant's mass. The key point: Most plant matter (about 95%) comes from water and air, not from soil. Choice B is correct because it identifies carbon dioxide from air as the source of most new material besides water, explaining where the maple tree's 498 pounds of added mass came from, as carbon from CO₂ forms the bulk of plant tissues. Choice A fails because it claims minerals taken from the soil provide most new material, when minerals are only small amounts and don't account for the tree's massive growth. To help students understand where plant materials come from: Do the 'where did the tree's mass come from?' thought experiment. A tiny tree seedling weighs 2 pounds. Ten years later, the tree weighs 500 pounds. Where did the 498 pounds come from? Students often say 'soil,' but if that were true, there would be a huge hole in the ground where the soil was consumed. The soil weighs about the same! The mass came from water (absorbed from soil) and carbon dioxide (from air). Use the equation: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Show that the inputs (CO₂ and H₂O) provide all the carbon, hydrogen, and oxygen in the output sugar. Compare: Materials (water and air) vs Energy (sunlight) vs Minerals (small amounts from soil). Ask: 'What is the plant made of? Carbon, hydrogen, oxygen. Where do these come from? Carbon from air (CO₂), hydrogen and oxygen from water (H₂O).' Point to hydroponics as proof—plants can grow without soil at all, with minerals dissolved in water. Watch for: Students who think soil is consumed for plant growth, or who think sunlight is a material. Always reinforce: Most plant mass from air and water, not soil.

Question 9

A model shows photosynthesis uses water from roots and carbon dioxide from leaves to make sugar. What do plants need to make new plant material?

  1. water and carbon dioxide from air (correct answer)
  2. sunlight, treated as a material source
  3. minerals, which make most plant matter
  4. soil particles absorbed as plant food
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. Plants need several things to grow, but it's important to distinguish materials (what the plant is made of) from energy (what powers the process). The main MATERIALS plants need are: (1) Water (H₂O)—absorbed through roots from the soil, provides hydrogen and oxygen atoms. (2) Carbon dioxide (CO₂)—absorbed through tiny holes in leaves from the air, provides carbon atoms. These two materials—water and air—provide the carbon, hydrogen, and oxygen that make up most of the plant's mass (wood, leaves, roots, fruits). Plants also need (3) Sunlight—but sunlight provides ENERGY for photosynthesis, not material for building plant tissues. (4) Minerals from soil—nitrogen, phosphorus, potassium, and others—but plants need these in small amounts; they don't provide the bulk of the plant's mass. The key point: Most plant matter (about 95%) comes from water and air, not from soil. Choice A is correct because it identifies water and carbon dioxide from air as needed for new plant material, directly matching the photosynthesis model where these inputs make sugar, providing the atoms for growth. Choice D fails because it suggests soil particles absorbed as plant food, when plants make their own food using water and CO₂, and soil only offers minor minerals. To help students understand where plant materials come from: Do the 'where did the tree's mass come from?' thought experiment. A tiny tree seedling weighs 2 pounds. Ten years later, the tree weighs 500 pounds. Where did the 498 pounds come from? Students often say 'soil,' but if that were true, there would be a huge hole in the ground where the soil was consumed. The soil weighs about the same! The mass came from water (absorbed from soil) and carbon dioxide (from air). Use the equation: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Show that the inputs (CO₂ and H₂O) provide all the carbon, hydrogen, and oxygen in the output sugar. Compare: Materials (water and air) vs Energy (sunlight) vs Minerals (small amounts from soil). Ask: 'What is the plant made of? Carbon, hydrogen, oxygen. Where do these come from? Carbon from air (CO₂), hydrogen and oxygen from water (H₂O).' Point to hydroponics as proof—plants can grow without soil at all, with minerals dissolved in water. Watch for: Students who think soil is consumed for plant growth, or who think sunlight is a material. Always reinforce: Most plant mass from air and water, not soil.

Question 10

In class, Bean A got water, air, sunlight, and minerals and grew tall; what materials are essential?

  1. Water and carbon dioxide from air (plus small minerals from soil) (correct answer)
  2. Mostly soil and minerals, with a little water from the pot
  3. Sunlight, water, and air as the plant's building materials
  4. Only water and minerals from soil, with no air needed
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. Plants need several things to grow, but it's important to distinguish materials (what the plant is made of) from energy (what powers the process). The main MATERIALS plants need are: (1) Water (H₂O)—absorbed through roots from the soil, provides hydrogen and oxygen atoms. (2) Carbon dioxide (CO₂)—absorbed through tiny holes in leaves from the air, provides carbon atoms. These two materials—water and air—provide the carbon, hydrogen, and oxygen that make up most of the plant's mass (wood, leaves, roots, fruits). Plants also need (3) Sunlight—but sunlight provides ENERGY for photosynthesis, not material for building plant tissues. (4) Minerals from soil—nitrogen, phosphorus, potassium, and others—but plants need these in small amounts; they don't provide the bulk of the plant's mass. The key point: Most plant matter (about 95%) comes from water and air, not from soil. Choice A is correct because it identifies water and carbon dioxide from air as the main materials, plus acknowledges small minerals from soil, which is accurate—these provide the carbon, hydrogen, and oxygen atoms that make up most of the plant's mass. Choice B fails because it claims soil and minerals are the main sources, when soil provides only minerals in small amounts—most plant mass comes from invisible carbon dioxide in the air and water. To help students understand where plant materials come from: Do the 'where did the tree's mass come from?' thought experiment. A tiny tree seedling weighs 2 pounds. Ten years later, the tree weighs 500 pounds. Where did the 498 pounds come from? Students often say 'soil,' but if that were true, there would be a huge hole in the ground where the soil was consumed. The soil weighs about the same! The mass came from water (absorbed from soil) and carbon dioxide (from air).

Question 11

A tomato plant in a garden absorbs water through roots and takes in carbon dioxide through tiny holes in leaves. It also needs small amounts of minerals from soil. Which materials are essential for plant growth?​​

  1. Mostly soil eaten by roots, plus water and minerals
  2. Water and carbon dioxide from air, plus small soil minerals (correct answer)
  3. Sunlight as material, plus water and minerals from soil
  4. Only minerals from soil, plus fertilizer for extra growth
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. The question describes the actual process of how plants obtain materials: water through roots (providing hydrogen and oxygen atoms) and carbon dioxide through stomata in leaves (providing carbon atoms). These two materials—water and CO₂—provide the carbon, hydrogen, and oxygen that make up about 95% of the plant's mass. The question also mentions small amounts of minerals from soil, which is accurate for the remaining 5%. Choice B is correct because it identifies water and carbon dioxide from air as the main materials, plus small soil minerals, which exactly matches the biological process described—tomatoes, like all plants, build their tissues primarily from H₂O and CO₂ through photosynthesis. Choice A fails because it claims plants eat soil through their roots and that soil is mostly consumed, when roots actually absorb water and dissolved minerals—the soil itself isn't consumed or turned into plant matter, which is why soil levels don't drop as plants grow. To help students visualize this process: Draw a tomato plant showing water entering roots and CO₂ entering leaves through stomata. Label the percentages: ~95% of plant mass from water + CO₂, ~5% from soil minerals. Ask: 'If a tomato plant produces 20 pounds of tomatoes, where did that mass come from?' Guide students to see that the carbon in those tomatoes came from air (CO₂) and the hydrogen/oxygen from water. Have them feel the weight of a tomato and realize they're holding solidified air and water!

Question 12

In class, Maya grew bean plants: with water and air they grew; without water they died. Based on this, which materials are essential for plant growth?

  1. water and carbon dioxide from air (correct answer)
  2. water and minerals from soil
  3. sunlight and minerals from soil
  4. mostly soil turned into plant matter
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. Plants need several things to grow, but it's important to distinguish materials (what the plant is made of) from energy (what powers the process). The main MATERIALS plants need are: (1) Water (H₂O)—absorbed through roots from the soil, provides hydrogen and oxygen atoms. (2) Carbon dioxide (CO₂)—absorbed through tiny holes in leaves from the air, provides carbon atoms. These two materials—water and air—provide the carbon, hydrogen, and oxygen that make up most of the plant's mass (wood, leaves, roots, fruits). Plants also need (3) Sunlight—but sunlight provides ENERGY for photosynthesis, not material for building plant tissues. (4) Minerals from soil—nitrogen, phosphorus, potassium, and others—but plants need these in small amounts; they don't provide the bulk of the plant's mass. The key point: Most plant matter (about 95%) comes from water and air, not from soil. Choice A is correct because it identifies water and carbon dioxide from air as the essential materials, aligning with Maya's experiment where plants grew with water and air but died without water, showing these provide the main building blocks for growth. Choice D fails because it claims mostly soil turned into plant matter, when soil provides only minerals in small amounts; this is a common misconception, as people assume soil is consumed, but experiments like Maya's show air and water are key. To help students understand where plant materials come from: Do the 'where did the tree's mass come from?' thought experiment. A tiny tree seedling weighs 2 pounds. Ten years later, the tree weighs 500 pounds. Where did the 498 pounds come from? Students often say 'soil,' but if that were true, there would be a huge hole in the ground where the soil was consumed. The soil weighs about the same! The mass came from water (absorbed from soil) and carbon dioxide (from air). Use the equation: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Show that the inputs (CO₂ and H₂O) provide all the carbon, hydrogen, and oxygen in the output sugar. Compare: Materials (water and air) vs Energy (sunlight) vs Minerals (small amounts from soil). Ask: 'What is the plant made of? Carbon, hydrogen, oxygen. Where do these come from? Carbon from air (CO₂), hydrogen and oxygen from water (H₂O).' Point to hydroponics as proof—plants can grow without soil at all, with minerals dissolved in water. Watch for: Students who think soil is consumed for plant growth, or who think sunlight is a material. Always reinforce: Most plant mass from air and water, not soil.

Question 13

Chen covered a plant with plastic so fresh air could not enter; it had water and light but grew poorly. Based on the description, what materials do plants need to grow?

  1. water and carbon dioxide from air (correct answer)
  2. water and soil as main materials
  3. sunlight and water as materials
  4. fertilizer as the main material
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. Plants need several things to grow, but it's important to distinguish materials (what the plant is made of) from energy (what powers the process). The main MATERIALS plants need are: (1) Water (H₂O)—absorbed through roots from the soil, provides hydrogen and oxygen atoms. (2) Carbon dioxide (CO₂)—absorbed through tiny holes in leaves from the air, provides carbon atoms. These two materials—water and air—provide the carbon, hydrogen, and oxygen that make up most of the plant's mass (wood, leaves, roots, fruits). Plants also need (3) Sunlight—but sunlight provides ENERGY for photosynthesis, not material for building plant tissues. (4) Minerals from soil—nitrogen, phosphorus, potassium, and others—but plants need these in small amounts; they don't provide the bulk of the plant's mass. The key point: Most plant matter (about 95%) comes from water and air, not from soil. Choice A is correct because it identifies water and carbon dioxide from air as needed materials, explaining why Chen's plant grew poorly without fresh air despite water and light, as CO₂ is crucial for building mass. Choice B fails because it claims water and soil as main materials, but the plastic cover blocked air, not soil, showing air (CO₂) is essential, not soil as a primary source. To help students understand where plant materials come from: Do the 'where did the tree's mass come from?' thought experiment. A tiny tree seedling weighs 2 pounds. Ten years later, the tree weighs 500 pounds. Where did the 498 pounds come from? Students often say 'soil,' but if that were true, there would be a huge hole in the ground where the soil was consumed. The soil weighs about the same! The mass came from water (absorbed from soil) and carbon dioxide (from air). Use the equation: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Show that the inputs (CO₂ and H₂O) provide all the carbon, hydrogen, and oxygen in the output sugar. Compare: Materials (water and air) vs Energy (sunlight) vs Minerals (small amounts from soil). Ask: 'What is the plant made of? Carbon, hydrogen, oxygen. Where do these come from? Carbon from air (CO₂), hydrogen and oxygen from water (H₂O).' Point to hydroponics as proof—plants can grow without soil at all, with minerals dissolved in water. Watch for: Students who think soil is consumed for plant growth, or who think sunlight is a material. Always reinforce: Most plant mass from air and water, not soil.

Question 14

A model shows photosynthesis uses water and carbon dioxide to make sugar; which provides the main materials for plant growth?

  1. water and carbon dioxide from air, plus small minerals (correct answer)
  2. oxygen from the air, plus water and soil minerals
  3. sunlight as the material, plus water and fertilizer
  4. soil is eaten by plants, plus water and sunlight
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. Plants need several things to grow, but it's important to distinguish materials (what the plant is made of) from energy (what powers the process). The main MATERIALS plants need are: (1) Water (H₂O)—absorbed through roots from the soil, provides hydrogen and oxygen atoms. (2) Carbon dioxide (CO₂)—absorbed through tiny holes in leaves from the air, provides carbon atoms. These two materials—water and air—provide the carbon, hydrogen, and oxygen that make up most of the plant's mass (wood, leaves, roots, fruits). Plants also need (3) Sunlight—but sunlight provides ENERGY for photosynthesis, not material for building plant tissues. (4) Minerals from soil—nitrogen, phosphorus, potassium, and others—but plants need these in small amounts; they don't provide the bulk of the plant's mass. The key point: Most plant matter (about 95%) comes from water and air, not from soil. Choice A is correct because it identifies water and carbon dioxide from air (or air and water) as the main materials, which is accurate—these provide the carbon, hydrogen, and oxygen atoms that make up most of the plant's mass. The answer may also mention sunlight (for energy) and minerals (small amounts), but it correctly emphasizes water and air as the chief sources of plant material. Choice D fails because it claims soil is the main source of materials, when soil provides only minerals in small amounts. This is a very common misconception—people see plants growing in soil and assume the soil provides the material for growth, but actually most plant mass comes from invisible gases in the air (carbon dioxide) and water. To help students understand where plant materials come from: Do the 'where did the tree's mass come from?' thought experiment. A tiny tree seedling weighs 2 pounds. Ten years later, the tree weighs 500 pounds. Where did the 498 pounds come from? Students often say 'soil,' but if that were true, there would be a huge hole in the ground where the soil was consumed. The soil weighs about the same! The mass came from water (absorbed from soil) and carbon dioxide (from air). Use the equation: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Show that the inputs (CO₂ and H₂O) provide all the carbon, hydrogen, and oxygen in the output sugar. Compare: Materials (water and air) vs Energy (sunlight) vs Minerals (small amounts from soil). Ask: 'What is the plant made of? Carbon, hydrogen, oxygen. Where do these come from? Carbon from air (CO₂), hydrogen and oxygen from water (H₂O).' Point to hydroponics as proof—plants can grow without soil at all, with minerals dissolved in water. Watch for: Students who think soil is consumed for plant growth, or who think sunlight is a material. Always reinforce: Most plant mass from air and water, not soil.

Question 15

Students grew Plant A with water, air, sunlight, and minerals; Plant C had no water and died. Based on the observations, plants need which materials to grow?

  1. water and minerals from soil
  2. water and carbon dioxide from air (correct answer)
  3. mostly soil changed into plant matter
  4. sunlight and oxygen from the air
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. Plants need several things to grow, but it's important to distinguish materials (what the plant is made of) from energy (what powers the process). The main MATERIALS plants need are: (1) Water (H₂O)—absorbed through roots from the soil, provides hydrogen and oxygen atoms. (2) Carbon dioxide (CO₂)—absorbed through tiny holes in leaves from the air, provides carbon atoms. These two materials—water and air—provide the carbon, hydrogen, and oxygen that make up most of the plant's mass (wood, leaves, roots, fruits). Plants also need (3) Sunlight—but sunlight provides ENERGY for photosynthesis, not material for building plant tissues. (4) Minerals from soil—nitrogen, phosphorus, potassium, and others—but plants need these in small amounts; they don't provide the bulk of the plant's mass. The key point: Most plant matter (about 95%) comes from water and air, not from soil. Choice B is correct because it identifies water and carbon dioxide from air as needed materials, matching the observation that Plant A grew with these but Plant C died without water, highlighting their essential role. Choice C fails because it claims mostly soil changed into plant matter, when soil provides only minor minerals and the lack of water, not soil, caused death. To help students understand where plant materials come from: Do the 'where did the tree's mass come from?' thought experiment. A tiny tree seedling weighs 2 pounds. Ten years later, the tree weighs 500 pounds. Where did the 498 pounds come from? Students often say 'soil,' but if that were true, there would be a huge hole in the ground where the soil was consumed. The soil weighs about the same! The mass came from water (absorbed from soil) and carbon dioxide (from air). Use the equation: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Show that the inputs (CO₂ and H₂O) provide all the carbon, hydrogen, and oxygen in the output sugar. Compare: Materials (water and air) vs Energy (sunlight) vs Minerals (small amounts from soil). Ask: 'What is the plant made of? Carbon, hydrogen, oxygen. Where do these come from? Carbon from air (CO₂), hydrogen and oxygen from water (H₂O).' Point to hydroponics as proof—plants can grow without soil at all, with minerals dissolved in water. Watch for: Students who think soil is consumed for plant growth, or who think sunlight is a material. Always reinforce: Most plant mass from air and water, not soil.

Question 16

In hydroponics, plants grow with no soil, just water with dissolved minerals and air; which materials are essential for growth?

  1. mostly soil particles, plus water and sunlight
  2. water and carbon dioxide from air, plus minerals (correct answer)
  3. only minerals in water, without air or water matter
  4. sunlight as a material, plus water and minerals
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. Plants need several things to grow, but it's important to distinguish materials (what the plant is made of) from energy (what powers the process). The main MATERIALS plants need are: (1) Water (H₂O)—absorbed through roots from the soil, provides hydrogen and oxygen atoms. (2) Carbon dioxide (CO₂)—absorbed through tiny holes in leaves from the air, provides carbon atoms. These two materials—water and air—provide the carbon, hydrogen, and oxygen that make up most of the plant's mass (wood, leaves, roots, fruits). Plants also need (3) Sunlight—but sunlight provides ENERGY for photosynthesis, not material for building plant tissues. (4) Minerals from soil—nitrogen, phosphorus, potassium, and others—but plants need these in small amounts; they don't provide the bulk of the plant's mass. The key point: Most plant matter (about 95%) comes from water and air, not from soil. Choice B is correct because it identifies water and carbon dioxide from air (or air and water) as the main materials, which is accurate—these provide the carbon, hydrogen, and oxygen atoms that make up most of the plant's mass. The answer may also mention sunlight (for energy) and minerals (small amounts), but it correctly emphasizes water and air as the chief sources of plant material. Choice A fails because it claims soil is the main source of materials, when soil provides only minerals in small amounts. This is a very common misconception—people see plants growing in soil and assume the soil provides the material for growth, but actually most plant mass comes from invisible gases in the air (carbon dioxide) and water. To help students understand where plant materials come from: Do the 'where did the tree's mass come from?' thought experiment. A tiny tree seedling weighs 2 pounds. Ten years later, the tree weighs 500 pounds. Where did the 498 pounds come from? Students often say 'soil,' but if that were true, there would be a huge hole in the ground where the soil was consumed. The soil weighs about the same! The mass came from water (absorbed from soil) and carbon dioxide (from air). Use the equation: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Show that the inputs (CO₂ and H₂O) provide all the carbon, hydrogen, and oxygen in the output sugar. Compare: Materials (water and air) vs Energy (sunlight) vs Minerals (small amounts from soil). Ask: 'What is the plant made of? Carbon, hydrogen, oxygen. Where do these come from? Carbon from air (CO₂), hydrogen and oxygen from water (H₂O).' Point to hydroponics as proof—plants can grow without soil at all, with minerals dissolved in water. Watch for: Students who think soil is consumed for plant growth, or who think sunlight is a material. Always reinforce: Most plant mass from air and water, not soil.

Question 17

A bean plant kept in sunlight but not watered wilted; based on this, which materials are required for growth?

  1. Only sunlight, because light is the plant's building material
  2. Water and soil minerals, with no need for air
  3. Water and carbon dioxide from air, plus small amounts of minerals (correct answer)
  4. Mostly soil particles, because plants eat dirt to grow
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. The experimental observation—plant wilted without water despite having sunlight—demonstrates that sunlight alone isn't sufficient and that water is an essential material. Water (H₂O) provides hydrogen and oxygen atoms for building plant tissues and is crucial for photosynthesis. Carbon dioxide (CO₂) from air provides carbon atoms. Together, water and CO₂ supply about 95% of the atoms in plant tissues. Choice C is correct because it identifies water and carbon dioxide from air as the main materials, plus small amounts of minerals—the wilting without water proves water is essential, and all plants need CO₂ from air for carbon. Choice A fails because it claims only sunlight is needed as a building material, but the experiment disproves this—the plant had sunlight but still wilted without water, and furthermore, sunlight provides energy, not material atoms for growth. To help students understand: Use this experiment to show the difference between energy (sunlight) and materials (water, CO₂). Ask: "Why did the plant wilt even though it had plenty of sunlight?" Because sunlight can't replace water—they serve different roles. Explain that photosynthesis needs both: materials (water + CO₂) AND energy (sunlight). It's like baking—you need ingredients (flour, water) AND heat from the oven. Neither alone is sufficient. Have students list what plants are made of (carbon, hydrogen, oxygen) and trace where each element comes from.

Question 18

Two plants got equal water, air, and sunlight; sand-grown plant was paler; what materials are still essential?

  1. Water and carbon dioxide from air (plus small minerals from soil) (correct answer)
  2. Only minerals from soil are essential; water and air are optional
  3. Mostly soil provides the plant's matter, with some water
  4. Sunlight is a material plants absorb to build stems and leaves
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. The main MATERIALS plants need are: (1) Water (H₂O)—absorbed through roots from the soil, provides hydrogen and oxygen atoms. (2) Carbon dioxide (CO₂)—absorbed through tiny holes in leaves from the air, provides carbon atoms. These two materials—water and air—provide the carbon, hydrogen, and oxygen that make up most of the plant's mass. The sand-grown plant was paler because sand lacks minerals (nitrogen for chlorophyll), but the plant still grew because it had the essential materials—water and air. Choice A is correct because it identifies water and carbon dioxide from air as the essential materials, plus acknowledges small minerals from soil—even though the sand-grown plant lacked some minerals and was paler, it still grew because it had the main materials (water and CO₂). Choice D fails because it suggests sunlight is a material that plants absorb to build stems and leaves, when sunlight provides energy, not material—light cannot become plant tissue. To help students understand: Do the thought experiment—if a plant grows in pure sand with just water and air, it still gains mass (though it may be pale from lack of minerals). Where did that mass come from? Not from the sand! It came from water and carbon dioxide from air. Compare: Essential materials (water and CO₂) vs helpful but small-amount materials (minerals) vs energy (sunlight). Watch for students who think sunlight is a material or who think minerals are optional.

Question 19

Two plants got the same water, air, and sunlight; the one in sand was paler—what materials do plants need to grow?

  1. water and soil only, because air is not needed
  2. water and carbon dioxide from air, plus minerals (correct answer)
  3. minerals from soil are the main plant-building material
  4. sunlight as the main material, plus water and soil
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. Plants need several things to grow, but it's important to distinguish materials (what the plant is made of) from energy (what powers the process). The main MATERIALS plants need are: (1) Water (H₂O)—absorbed through roots from the soil, provides hydrogen and oxygen atoms. (2) Carbon dioxide (CO₂)—absorbed through tiny holes in leaves from the air, provides carbon atoms. These two materials—water and air—provide the carbon, hydrogen, and oxygen that make up most of the plant's mass (wood, leaves, roots, fruits). Plants also need (3) Sunlight—but sunlight provides ENERGY for photosynthesis, not material for building plant tissues. (4) Minerals from soil—nitrogen, phosphorus, potassium, and others—but plants need these in small amounts; they don't provide the bulk of the plant's mass. The key point: Most plant matter (about 95%) comes from water and air, not from soil. Choice B is correct because it identifies water and carbon dioxide from air (or air and water) as the main materials, which is accurate—these provide the carbon, hydrogen, and oxygen atoms that make up most of the plant's mass. The answer may also mention sunlight (for energy) and minerals (small amounts), but it correctly emphasizes water and air as the chief sources of plant material. Choice C fails because it claims minerals from soil are the main source of materials, when soil provides only minerals in small amounts. This is a very common misconception—people see plants growing in soil and assume the soil provides the material for growth, but actually most plant mass comes from invisible gases in the air (carbon dioxide) and water. To help students understand where plant materials come from: Do the 'where did the tree's mass come from?' thought experiment. A tiny tree seedling weighs 2 pounds. Ten years later, the tree weighs 500 pounds. Where did the 498 pounds come from? Students often say 'soil,' but if that were true, there would be a huge hole in the ground where the soil was consumed. The soil weighs about the same! The mass came from water (absorbed from soil) and carbon dioxide (from air). Use the equation: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Show that the inputs (CO₂ and H₂O) provide all the carbon, hydrogen, and oxygen in the output sugar. Compare: Materials (water and air) vs Energy (sunlight) vs Minerals (small amounts from soil). Ask: 'What is the plant made of? Carbon, hydrogen, oxygen. Where do these come from? Carbon from air (CO₂), hydrogen and oxygen from water (H₂O).' Point to hydroponics as proof—plants can grow without soil at all, with minerals dissolved in water. Watch for: Students who think soil is consumed for plant growth, or who think sunlight is a material. Always reinforce: Most plant mass from air and water, not soil.

Question 20

Two identical plants got the same water, air, and sunlight; the one in sand was paler but still grew. Based on this, the plant gets the materials for growth chiefly from what?

  1. water and carbon dioxide from air (correct answer)
  2. equal amounts from soil, water, and air
  3. mostly minerals and nutrients in soil
  4. sunlight used as the plant's matter
Explanation: This question tests the ability to identify the materials plants need for growth, specifically recognizing that plants get materials chiefly from air and water (NGSS 5-LS1-1). Students must distinguish between main materials and minor materials, and between materials and energy. Plants need several things to grow, but it's important to distinguish materials (what the plant is made of) from energy (what powers the process). The main MATERIALS plants need are: (1) Water (H₂O)—absorbed through roots from the soil, provides hydrogen and oxygen atoms. (2) Carbon dioxide (CO₂)—absorbed through tiny holes in leaves from the air, provides carbon atoms. These two materials—water and air—provide the carbon, hydrogen, and oxygen that make up most of the plant's mass (wood, leaves, roots, fruits). Plants also need (3) Sunlight—but sunlight provides ENERGY for photosynthesis, not material for building plant tissues. (4) Minerals from soil—nitrogen, phosphorus, potassium, and others—but plants need these in small amounts; they don't provide the bulk of the plant's mass. The key point: Most plant matter (about 95%) comes from water and air, not from soil. Choice A is correct because it identifies water and carbon dioxide from air as the chief sources, explaining why the plant in sand still grew despite paler color, showing minerals affect health but not main mass. Choice C fails because it claims mostly minerals and nutrients in soil, but the sand plant's growth proves soil isn't the primary material source. To help students understand where plant materials come from: Do the 'where did the tree's mass come from?' thought experiment. A tiny tree seedling weighs 2 pounds. Ten years later, the tree weighs 500 pounds. Where did the 498 pounds come from? Students often say 'soil,' but if that were true, there would be a huge hole in the ground where the soil was consumed. The soil weighs about the same! The mass came from water (absorbed from soil) and carbon dioxide (from air). Use the equation: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Show that the inputs (CO₂ and H₂O) provide all the carbon, hydrogen, and oxygen in the output sugar. Compare: Materials (water and air) vs Energy (sunlight) vs Minerals (small amounts from soil). Ask: 'What is the plant made of? Carbon, hydrogen, oxygen. Where do these come from? Carbon from air (CO₂), hydrogen and oxygen from water (H₂O).' Point to hydroponics as proof—plants can grow without soil at all, with minerals dissolved in water. Watch for: Students who think soil is consumed for plant growth, or who think sunlight is a material. Always reinforce: Most plant mass from air and water, not soil.