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In anaerobic respiration, oxygen is not used in the breakdown of respiratory substrate.

1. In anaerobic respiration, oxygen is not used in the breakdown of respiratory substrate.
2. In anaerobic respiration, oxygen is used in the breakdown of respiratory substrate.
3. In anaerobic respiration, oxygen is partially used in the breakdown of respiratory substrate.
4. In anaerobic respiration, oxygen is used only in the initial stages of the breakdown of respiratory substrate.

Correct answer: In anaerobic respiration, oxygen is not used in the breakdown of respiratory substrate.

Solution

Anaerobic respiration occurs without oxygen, so the respiratory substrate is broken down by pathways that do not require O2. Therefore, the statement saying oxygen is not used is correct.

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