Lesson T2.2.2

T2.2.2 Aerobic respiration word summary Quiz: KS3 Biology, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T2.2.2, Aerobic respiration word summary: 20 multiple choice questions for the KS3 Biology (National Curriculum), Unit 2: Material cycles and energy, written with Revision Ninja.

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The 20 questions

  1. Which word summary correctly describes aerobic respiration?

    • Glucose + oxygen to carbon dioxide + water, releasing energy
    • Glucose + water to oxygen + carbon dioxide, releasing energy
    • Carbon dioxide + water to glucose + oxygen, storing energy in the cell
    • Glucose + carbon dioxide to oxygen + water, releasing energy

  2. What are the reactants of aerobic respiration?

    • Glucose and oxygen
    • Glucose and carbon dioxide
    • Carbon dioxide and water
    • Lactic acid and oxygen

  3. What are the products of aerobic respiration?

    • Glucose and oxygen
    • Ethanol and carbon dioxide
    • Carbon dioxide and water
    • Lactic acid and water

  4. Why is respiration described as aerobic?

    • It happens only in plant cells
    • It produces air as a waste product
    • It needs oxygen
    • It happens only in the dark

  5. What is the energy released in respiration used for?

    • Making glucose from carbon dioxide and water in the leaves
    • Movement, active transport, growth and keeping warm
    • Releasing oxygen through the stomata
    • Building chlorophyll in the leaves

  6. How does the aerobic respiration word summary compare with photosynthesis?

    • Both reactions need oxygen as a reactant
    • Respiration releases energy from glucose; photosynthesis stores it
    • Both reactions store energy in glucose molecules that the cell makes
    • Both reactions take place only in the nucleus

  7. Where does the carbon dioxide from respiration leave an animal's body?

    • Through the roots into the soil
    • Through the xylem into the phloem
    • Through the chloroplasts into the nucleus
    • Through the lungs when breathing out

  8. Which gas would a student expect to rise in a sealed container of germinating seeds?

    • Nitrogen
    • Hydrogen
    • Carbon dioxide
    • Oxygen rising steadily

  9. Where does oxygen delivered to a mouse's body go in its cells?

    • To the mitochondria for respiration
    • To the stomata to be released
    • To the chloroplasts for photosynthesis
    • To the phloem to be stored as starch

  10. What is the role of oxygen in aerobic respiration?

    • It is the reactant that allows glucose to be fully broken down
    • It turns carbon dioxide into water
    • It is the main product released from the cell
    • It is stored as glucose inside the cell for the body to use later

  11. Why does aerobic respiration release much more energy per glucose than anaerobic respiration?

    • Glucose is stored as starch in the cell before it is used
    • Oxygen acts only as a catalyst that speeds up the reaction
    • Glucose is converted into lactic acid first
    • Glucose is broken down completely using oxygen

  12. Which substance is the energy source in aerobic respiration?

    • Oxygen
    • Carbon dioxide
    • Water
    • Glucose

  13. A plant respires in the dark. Which gas does it take in?

    • Carbon dioxide
    • Water vapour
    • Nitrogen
    • Oxygen

  14. Why do aerobic organisms need to breathe?

    • To take in carbon dioxide for photosynthesis in their green leaves
    • To remove oxygen from the blood
    • To take in oxygen for respiration and remove carbon dioxide
    • To release glucose into the air

  15. In the aerobic respiration word summary, what does the energy represent?

    • Energy that starts the reaction as a reactant in the cell
    • Energy absorbed from the surroundings by the plant cell
    • Energy released as an outcome of the reaction
    • Energy stored in the oxygen molecules that are breathed in

  16. Which organ takes oxygen into the blood in humans?

    • Lungs
    • Stomach
    • Liver
    • Kidneys

  17. What happens to the carbon from glucose during aerobic respiration?

    • It is released as oxygen gas from the cell
    • It is stored as lactic acid inside the muscle cells
    • It is released as carbon dioxide
    • It is converted into water that the cell stores

  18. Which factor increases the rate of aerobic respiration in muscles during exercise?

    • Decreased blood flow to the muscles during hard exercise
    • Increased oxygen supply to the muscles
    • Lower body temperature in the muscles during a race
    • Reduced glucose supply to the muscles during a race

  19. What happens to carbon dioxide produced by respiring cells?

    • It diffuses into the blood and is breathed out
    • It stays in the cell to be used as fuel for respiration
    • It is converted into oxygen inside the cell
    • It is stored in the cell as starch for later use

  20. Why does the aerobic respiration word summary not include light?

    • Light is needed only for photosynthesis in the leaves
    • Light destroys glucose during respiration
    • Respiration releases energy rather than capturing light
    • Respiration only takes place in the dark parts of the cell

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