Assertion (A): Rhizobium bacteria helps in nitrogen fixation.
Reason (R): It coverts atmospheric nitrogen into nitrates which are essential for the growth of plants.

A is true but R is false.

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Both A and R are true and R is the correct explanation of A.

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A is false but R is true.

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Both A and R are true but R is NOT the correct explanation of A.

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Solution

The correct option is B
Both A and R are true and R is the correct explanation of A.

Rhizobium bacteria living in the root nodules of leguminous plants enrich the soil by fixing the atmospheric nitrogen as nitrates which are essential for the growth of plants.
Some free living bacteria in soil, cyanobacteria Nostoc can also fix nitrogen biologically.

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Rhizobium helps in fixation of atmospheric nitrogen into ammonia.

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