AQA · Biology · 8461

GCSE Biology: Aerobic and anaerobic respiration

Bioenergetics · AQA GCSE Biology (8461), specification point 4.4.2.1. Cards are generated from the exam board's own specification for "Aerobic and anaerobic respiration", and every card links back to the page it came from. Specification © AQA — used with attribution.

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  1. Is cellular respiration an exothermic or endothermic reaction?

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    Exothermic — it transfers energy to the surroundings and occurs continuously in living cells.

  2. What is the difference between aerobic and anaerobic respiration?

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    Aerobic respiration uses oxygen; anaerobic respiration takes place without oxygen.

  3. Give one reason organisms need energy from respiration.

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    Any one of: chemical reactions to build larger molecules, movement, or keeping warm.

  4. What is the word equation for aerobic respiration?

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    glucose + oxygen → carbon dioxide + water

  5. What is the chemical formula for glucose?

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    C6H12O6

  6. What is the word equation for anaerobic respiration in muscles?

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    glucose → lactic acid

  7. Why does anaerobic respiration transfer much less energy than aerobic respiration?

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    Because the oxidation of glucose is incomplete in anaerobic respiration.

  8. What is the word equation for anaerobic respiration in plant and yeast cells?

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    glucose → ethanol + carbon dioxide

  9. Anaerobic respiration in yeast cells is called ?.

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    fermentation

  10. Name one product whose manufacture relies on fermentation by yeast.

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    Bread or alcoholic drinks.

  11. Which product is formed by anaerobic respiration in muscle cells?

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    Lactic acid.

  12. Which type of respiration transfers more energy per glucose molecule?

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    Aerobic respiration, because glucose is fully oxidised using oxygen.

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