Photosynthesis and Cellular Respiration Quiz

Grade 5 · Science · Quiz

Test your knowledge of how plants make food and how living cells release energy.

Questions

  1. Where does photosynthesis take place inside plant cells?

    1. Mitochondria
    2. Nucleus
    3. Chloroplasts
    4. Cell wall
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    Answer: Chloroplasts

    Chloroplasts are the organelles where photosynthesis occurs. They contain the green pigment chlorophyll that captures light energy.

  2. Plants produce glucose during photosynthesis and then use some of it in cellular respiration.

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    Answer: True

    Plants make glucose via photosynthesis and use some of it immediately in their own cellular respiration to power growth and other functions.

  3. The sugar produced during photosynthesis is called ___.

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    Answer: glucose

    Glucose (C6H12O6) is the primary sugar produced by photosynthesis. It stores the light energy in chemical bonds that can be released during cellular respiration.

  4. What gas do living cells consume during cellular respiration?

    1. Carbon dioxide
    2. Nitrogen
    3. Oxygen
    4. Hydrogen
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    Answer: Oxygen

    Cellular respiration requires oxygen as a reactant. Oxygen is consumed to break down glucose, releasing energy, carbon dioxide, and water.

  5. Cellular respiration releases energy stored in glucose as ATP.

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    Answer: True

    ATP (adenosine triphosphate) is the universal energy currency of cells. Energy from glucose is captured in ATP molecules, which then power every cellular process.

  6. What are the products of cellular respiration?

    1. Glucose and oxygen
    2. Carbon dioxide, water, and energy
    3. Chlorophyll and ATP
    4. Nitrogen and water
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    Answer: Carbon dioxide, water, and energy

    Cellular respiration: C6H12O6 + 6O2 → 6CO2 + 6H2O + energy (ATP). The carbon dioxide is exhaled; water is produced as metabolic water.

  7. Plants absorb carbon dioxide through tiny pores in their leaves called ___.

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    Answer: stomata

    Stomata (singular: stoma) are microscopic pores on leaf surfaces that allow CO2 to enter and O2 and water vapor to exit. Guard cells control their opening and closing.

  8. Which organisms CANNOT perform photosynthesis?

    1. Grass
    2. Algae
    3. Oak trees
    4. Fungi
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    Answer: Fungi

    Fungi have no chlorophyll and no chloroplasts — they cannot perform photosynthesis. Instead, fungi are decomposers that absorb nutrients from dead organic matter.

  9. Animals perform photosynthesis to get energy from sunlight.

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    Answer: False

    Animals cannot perform photosynthesis — they have no chlorophyll or chloroplasts. Animals get energy by eating other organisms and performing cellular respiration.

  10. What provides the energy input for photosynthesis?

    1. Heat from the ground
    2. ATP from respiration
    3. Sunlight
    4. Oxygen
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    Answer: Sunlight

    Sunlight provides the energy that drives photosynthesis, converting low-energy molecules (CO2 and H2O) into high-energy glucose. Without sunlight, photosynthesis stops.

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