Science (086) — AI-generated practice question

| Head | Aerobic Respiration | Anaerobic Respiration |
|---|---|---|
| (i) Requirement of oxygen | Requires oxygen | Does not require oxygen |
| (ii) End products | CO₂ and water | Ethanol + CO₂ (in yeast); lactic acid (in muscle cells) |
| (iii) Energy released | Much greater amount of energy released | Less energy released |

In aerobic respiration, pyruvate is broken down in the mitochondria using oxygen. In anaerobic respiration, pyruvate is broken down in the cytoplasm without oxygen.

Source: Life Processes, Section 5.3 Respiration

---

• The examiner expects a tabular format for "compare under heads" questions — it earns full marks neatly.
• Must mention both types of anaerobic end products: ethanol + CO₂ (yeast/fermentation) and lactic acid (muscle cells during sudden activity). Missing either may cost half a mark.
• The phrase "a lot greater" (from the textbook) regarding aerobic energy release is key — make it explicit.
• Location (mitochondria vs. cytoplasm) is a bonus point that strengthens the answer.