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Biology Grade 6-8

Science: Photosynthesis and Cellular Respiration

How cells make and use energy

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How cells make and use energy

Biology - Grade 6-8

Instructions: Read each problem carefully. Answer in complete sentences and show your thinking when needed.
  1. 1
    A leaf uses sunlight, water, and carbon dioxide to make sugar and release oxygen.

    What is the main purpose of photosynthesis in plants?

  2. 2
    A mitochondrion in a cell uses glucose and oxygen to release energy.

    What is the main purpose of cellular respiration in living cells?

  3. 3
    Sunlight, water, and carbon dioxide enter a leaf for photosynthesis.

    List the reactants needed for photosynthesis.

  4. 4
    A leaf produces glucose and oxygen during photosynthesis.

    List the products made by photosynthesis.

  5. 5
    Glucose and oxygen enter a mitochondrion for cellular respiration.

    List the reactants needed for cellular respiration.

  6. 6
    A mitochondrion releases energy, water, and carbon dioxide.

    List the products made by cellular respiration.

  7. 7
    A plant cell with highlighted green chloroplasts.

    In which organelle does photosynthesis take place?

  8. 8
    An animal cell with highlighted mitochondria.

    In which organelle does most cellular respiration take place?

  9. 9
    Photosynthesis and cellular respiration form a cycle between leaves and cells.

    Explain how photosynthesis and cellular respiration are related.

  10. 10
    A sunlit plant with water and carbon dioxide produces oxygen and sugar.

    A plant is placed in sunlight and given water and carbon dioxide. What two main substances will it produce during photosynthesis?

  11. 11
    A muscle cell uses glucose and oxygen in mitochondria to release energy.

    A muscle cell uses glucose and oxygen. What process is it carrying out, and what does it release?

  12. 12
    An animal depends on a plant for food and oxygen.

    Why do animals depend on photosynthesis even though animals do not perform photosynthesis?

  13. 13
    Both plant and animal cells contain mitochondria.

    True or false: Only plants carry out cellular respiration. Explain your answer.

  14. 14
    Sunlight energy is stored in sugar, then released by a mitochondrion.

    Describe what happens to energy during photosynthesis and during cellular respiration.

  15. 15
    Plant cells photosynthesize and both plant and animal cells carry out respiration.

    Complete the comparison: Photosynthesis mostly happens in plant cells and requires light, while cellular respiration happens in both plant and animal cells and does not require light directly. Explain why both processes are important.

LivePhysics™.com Biology - Grade 6-8

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