Science — AI-generated practice question

Differences between Aerobic and Anaerobic Respiration:

| Feature | Aerobic Respiration | Anaerobic Respiration |
|---|---|---|
| Oxygen required | Yes | No |
| Site | Cytoplasm + Mitochondria | Cytoplasm only |
| End products | CO₂ + H₂O + Energy | Ethanol + CO₂ (in yeast) OR Lactic acid + Energy (in muscle cells) |
| Energy released | More (complete breakdown) | Less (incomplete breakdown) |
| Glucose breakdown | Complete | Incomplete |

Aerobic respiration:
Glucose → CO₂ + H₂O + Energy (ATP)

Anaerobic respiration (yeast):
Glucose → Ethanol + CO₂ + Energy

Anaerobic respiration (muscle cells during heavy exercise):
Glucose → Lactic acid + Energy

Aerobic respiration makes more energy available to the organism than anaerobic respiration.

Organisms using anaerobic respiration: Yeast, some bacteria, and human muscle cells (temporarily, during intense exercise).

Source: Life Processes, Chapter 5

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• Examiners expect a comparison table or 4–5 contrasting points — this earns the bulk of the marks.
• Mention both types of anaerobic end products: ethanol + CO₂ (yeast) and lactic acid (muscles). Missing either loses a mark.
• The key phrase "aerobic respiration makes more energy available" is directly from the textbook summary — use it.
• Name at least 2–3 organisms/examples for anaerobic respiration.
• Write the word equations; they are expected and fetch easy marks.