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Which of the following statements about methanogens is not correct?

1. They produce methane gas.
2. They can be used to produce biogas.
3. They are found in the rumen of cattle and their excreta.
4. They grow aerobically and breakdown cellulose-rich food.

Correct answer: They grow aerobically and breakdown cellulose-rich food.

Solution

Methanogens are strict anaerobes, so they do not grow aerobically. They are methane-producing archaea found in oxygen-free environments like the rumen and are useful in biogas production.

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