BioenergeticsAQA GCSE Biology (8461)

Respiration

Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next. (2026)

Practice progress

5 MCQs

0 of 5 attempted

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Remaining

1
Which of the following best describes respiration?
Answer & explanation
Correct: option B
Respiration is exothermic (transfers energy OUT) and happens continuously in all living cells.
2
Which is the correct balanced equation for aerobic respiration?
Answer & explanation
Correct: option B
Option a is photosynthesis (the reverse). Option c is yeast fermentation. Option d is animal anaerobic.
3
Anaerobic respiration in muscle cells produces:
Answer & explanation
Correct: option B
In animals (including human muscles), anaerobic respiration produces only lactic acid. CO₂ is not produced in this pathway.
4
Yeast fermentation produces which two substances?
Answer & explanation
Correct: option B
Yeast (and plant cells) anaerobic respiration: glucose → ethanol + carbon dioxide. CO₂ makes bread rise; ethanol is the alcohol in beer/wine.
5
Why does anaerobic respiration release less energy than aerobic?
Answer & explanation
Correct: option B
Without oxygen, glucose is only partially oxidised. Most of its energy stays in the lactic acid or ethanol product.

BioenergeticsAQA GCSE Biology (8461)

Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next. (2026)

5 MCQs

0 of 5 attempted

Correct

Incorrect

Remaining

1
Which of the following best describes respiration?
Answer & explanation
Correct: option B
Respiration is exothermic (transfers energy OUT) and happens continuously in all living cells.
2
Which is the correct balanced equation for aerobic respiration?
Answer & explanation
Correct: option B
Option a is photosynthesis (the reverse). Option c is yeast fermentation. Option d is animal anaerobic.
3
Anaerobic respiration in muscle cells produces:
Answer & explanation
Correct: option B
In animals (including human muscles), anaerobic respiration produces only lactic acid. CO₂ is not produced in this pathway.
4
Yeast fermentation produces which two substances?
Answer & explanation
Correct: option B
Yeast (and plant cells) anaerobic respiration: glucose → ethanol + carbon dioxide. CO₂ makes bread rise; ethanol is the alcohol in beer/wine.
5
Why does anaerobic respiration release less energy than aerobic?
Answer & explanation
Correct: option B
Without oxygen, glucose is only partially oxidised. Most of its energy stays in the lactic acid or ethanol product.