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9th grade · Science · Unit 3 of 11

Photosynthesis & Respiration

How cells make and use energy

What your child practices

The reactants, products and location of photosynthesis and cellular respiration, why they are complementary, and how they link plants, animals and the carbon cycle.

Oregon State Standards learning standard: HS.LS1.5; HS.LS1.7 · photosynthesis and cellular respiration

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Where in a cell is most of the energy released by cellular respiration?

    • mitochondria
    • the cell membrane
    • the nucleus
    • chloroplasts

  2. Question 2

    A sealed jar holds a healthy plant and a small snail in the light. Why can both survive for a while?

    • The plant makes no oxygen
    • The plant's oxygen supports the snail's respiration, and the snail's carbon dioxide supports the plant
    • Neither one uses energy
    • The snail makes oxygen

  3. Question 3

    Why are photosynthesis and cellular respiration called complementary?

    • They both make oxygen
    • The products of each are the reactants of the other
    • They both happen only in animals
    • They both need light

  4. Question 4

    What happens to the dynamic equilibrium of the atmosphere if photosynthesis falls and respiration and burning continue?

    • Oxygen levels rise sharply
    • Nitrogen levels rise
    • Nothing changes
    • Carbon dioxide levels rise

  5. Question 5

    Which gas released by photosynthesis do animals use in cellular respiration?

    • hydrogen
    • oxygen
    • nitrogen
    • carbon dioxide

  6. Question 6

    Photosynthesis or cellular respiration? Sort each statement.

    Sort into: ☀️ Photosynthesis · ⚡ Cellular respiration

    • 🌿Happens in chloroplasts
    • 🌫️Takes in carbon dioxide
    • 🔥Breaks down glucose
    • 💭Releases carbon dioxide
    • 🌬️Uses oxygen
    • 💨Releases oxygen

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