In the given diagram, the gas X can be:

1. Hydrogen sulfide 2. Carbon monoxide
3. Ammonia 4. Oxygen
Subtopic:  Microbes in Production of Biogas |
 84%
Level 1: 80%+
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Methanogens do not produce:

1. oxygen 2. methane
3. hydrogen sulfide 4. carbon dioxide

Subtopic:  Microbes in Production of Biogas |
 89%
Level 1: 80%+
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Biogas is a mixture of:

1. Methane, Carbon dioxide, and Hydrogen sulfide
2. Methane, Carbon dioxide, and Ammonia
3. Methane, Ammonia, and Hydrogen sulfide
4. Ammonia, Carbon dioxide, and Hydrogen sulfide
Subtopic:  Microbes in Production of Biogas |
 91%
Level 1: 80%+
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