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Chemosynthetic autotrophic bacteria play a great role in recycling nutrients like nitrogen, phosphorous, etc,.

Methanogens are a type of eubacteria

Bacterial structure is very complex but they have a very simple behaviour

Bacteria having heterocyst only can fix nitrogen

answer is A.

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Detailed Solution

Chemosynthetic autotrophic bacteria oxidise various inorganic substances such as nitrates, nitrites and ammonia and use the released energy for their ATP production. They play a great role in recycling nutrients like nitrogen, phosphorous, iron and sulphur.
Methanogens are a type of archaebacteria.
Bacterial structure is very simple but they have a very complex behaviour.
There are few free-living nitrogen fixing bacteria that do not have heterocyst. Heterocyst is generally found in cyanobacteria.

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