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7th grade Photosynthesis: how plants make food from light, water and air worksheet

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Photosynthesis: how plants make food from light, water and air

Grade 7 Science Worksheet - Building Confidence

NameDate

Circle the best answer.

  1. Ari reads a leaf arrow diagram. Arrow X carries a gas from the air into the leaf. What does arrow X carry?

    • Carbon dioxide
    • Oxygen
    • Water
    • Sugar

  2. Bo reads a leaf arrow diagram. Arrow Y carries a gas out of the leaf into the air. What does arrow Y carry?

    • Carbon dioxide
    • Oxygen
    • Light energy
    • Water

  3. Esme reads a leaf arrow diagram. Arrow Z runs from the roots and stem into the leaf. What does arrow Z carry?

    • Sugar from the soil
    • Water
    • Plant food from the soil
    • Carbon dioxide

  5. Jun sorts the parts of photosynthesis. Is sugar an input or an output?

    • Output: sugar leaves the leaf as a gas
    • Output: the leaf makes sugar and sends it through the plant
    • Input: the roots take sugar in from the soil to feed the leaf
    • Input: sugar comes in mixed with the water

  6. Kira sorts the parts of photosynthesis. Is oxygen an input or an output?

    Use the picture in question 4.

    • Input: the leaf takes oxygen in to make sugar
    • Input: the roots take oxygen from the soil water
    • Output: the leaf gives off oxygen into the air
    • Output: oxygen leaves the plant through the roots

  7. Luz sorts the parts of photosynthesis. Is light energy an input or an output?

    Use the picture in question 4.

    • Neither: a leaf makes sugar just as well in the dark
    • Output: the leaf glows with light it makes
    • Input: light is a material that becomes part of the sugar it makes
    • Input: light energy powers the change and is stored in the sugar

  8. Cell wall, cell membrane, cytoplasm, nucleus, mitochondria, chloroplasts, large central vacuole. Milo reads about a leaf cell. In which part of the cell does photosynthesis take place?

    • Chloroplasts
    • Mitochondria
    • Nucleus
    • Cell wall

  9. “not to scale” Noah pulls up a carrot from the school garden. Which part of the carrot plant makes most of its sugar?

    • The root, because it is full of sugar
    • The green leaves, because their cells have chloroplasts
    • The root, because it is in the soil
    • The root, because it is the biggest part of the whole plant

  10. Tala copies the word equation for photosynthesis. Which word belongs in the blank?

    • Oxygen
    • Sugar
    • Carbon dioxide
    • Soil minerals

  11. Zee copies the word equation. What is written above the arrow, because it powers the change but is not a material?

    • Oxygen
    • Light energy
    • Heat from the ground
    • Soil
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7th grade Photosynthesis: how plants make food from light, water and air worksheet – printable
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About this worksheet

Photosynthesis: how plants make food from light, water and air. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

  • I can name the inputs (light energy, water, carbon dioxide) and outputs (sugar, oxygen) of photosynthesis, and say it happens in chloroplasts.
  • I can tell which arrows carry matter and which carry energy, and say the light energy is stored in the sugar.
  • I can explain from evidence that most of a plant's new mass comes from carbon dioxide in the air, not from the soil.
  • I can predict what happens to sugar-making when light, water or carbon dioxide changes, and read an investigation card about it.

Standard: MS-LS1-6

Words to know

photosynthesis: How green plant cells make sugar from carbon dioxide and water, using light energy

input / output: What goes in / what comes out

chloroplast: The green part of a plant cell where photosynthesis happens

stomata: Tiny openings, mostly under a leaf, that let gases in and out

carbon dioxide: A gas in the air; the leaf takes it in to build sugar

oxygen: A gas the leaf gives off while making sugar

sugar: The food a plant makes; it stores the light energy

matter / energy: Stuff that has mass / what makes changes happen (light is energy)

Common mistakes

Your child thought plants take their food, or most of their mass, from the soil. Ask your child what goes into a leaf: light, water and carbon dioxide from the air. Soil gives water and a few minerals, not food.

Your child swapped the gases: in making sugar, a leaf takes in carbon dioxide and gives off oxygen. Ask your child which gas people breathe out, and which gas a leaf uses.

Your child thought light is a material that becomes part of the plant. Light supplies energy; the sugar is built from carbon dioxide and water. Ask your child which arrows carry stuff you could weigh.

Questions parents ask

What is the most common mistake with photosynthesis: how plants make food from light, water and air?

Your child thought plants take their food, or most of their mass, from the soil. Ask your child what goes into a leaf: light, water and carbon dioxide from the air. Soil gives water and a few minerals, not food.

Are these 7th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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