Aerobic Respiration · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Aerobic Respiration: Releasing Energy from Glucose

Science · Organisms & Life Processes · ages 12-13
Name ______________________   Date ____________

  1. Where in a cell does aerobic respiration mainly take place?

    • Nucleus
    • Cell membrane
    • Mitochondria

  2. What are the products of aerobic respiration?

    • Glucose and oxygen
    • Carbon dioxide and water
    • Oxygen and water

  3. Breathing and respiration mean exactly the same thing.

    Circle one:   True   False

  4. During PE, why does your heart beat faster?

    • To pump oxygen and glucose to muscle cells faster
    • To cool the muscles down
    • To stop carbon dioxide forming

  5. Which word equation correctly describes aerobic respiration?

    • carbon dioxide + water → glucose + oxygen
    • glucose + oxygen → carbon dioxide + water
    • glucose + carbon dioxide → oxygen + water

  6. Look at the graph. How many more breaths per minute did the class take after PE than at rest?

    Resting15After PE35

    Answer: ______________

  7. A sprinter's muscle cells are respiring hard. Which statement is correct?

    • Respiration stops as soon as breathing rate goes up
    • The mitochondria in the muscle cells are releasing energy from glucose and oxygen
    • The sprinter's lungs are respiring instead of the muscle cells

  8. Amir says: 'When I run, my muscle cells make more oxygen through respiration.' What is wrong with Amir's statement?

    • Muscles do not need oxygen when running
    • Respiration only happens in the lungs
    • Respiration uses oxygen, it does not make it
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Answer key

For grown-ups. Fold this page away before handing over the rest.

Aerobic Respiration: Releasing Energy from Glucose W1-mt_mquPi2IP-J-s1

  1. Mitochondria · Mitochondria are the parts of the cell where energy is released from glucose and oxygen.
  2. Carbon dioxide and water · Carbon dioxide and water are made when glucose and oxygen react inside your cells.
  3. False · Breathing moves air in and out of your lungs. Respiration is the chemical process inside your cells that releases energy.
  4. To pump oxygen and glucose to muscle cells faster · Muscle cells respire faster during exercise, so blood must carry oxygen and glucose to them more quickly.
  5. glucose + oxygen → carbon dioxide + water · Glucose and oxygen are the reactants. They combine and release carbon dioxide and water as waste products.
  6. 20 · 35 breaths minus 15 breaths equals 20 more breaths a minute, bringing in extra oxygen for the harder-working muscle cells.
  7. The mitochondria in the muscle cells are releasing energy from glucose and oxygen · Respiration happens inside mitochondria wherever cells need energy, including hard-working muscle cells.
  8. Respiration uses oxygen, it does not make it · Oxygen is a reactant in the equation. It gets used up to release energy, not created.
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