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What is not required in the formation of biogas in a biogas plant?

1. water
2. Oxygen
3. cow-dung
4. Anaerobic bacteria

Correct answer: Oxygen

Solution

Biogas is formed by anaerobic bacteria, which break down organic matter like cow-dung in the absence of oxygen. Therefore, oxygen is not required; in fact, it must be excluded for efficient biogas production.

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