Question

Choose the correct answer from the alternatives given.
The fertility of soil is reduced by

• A. ammonifying bacteria
• B. denitrifying bacteria
• C. nitrifying bacteria
• D. nitrogen fixing bacteria

Answer 1

The correct option is B denitrifying bacteria

Decomposers also break down the bodies of dead organisms resulting in nitrogen being returned to the soil as ammonia. In some conditions, denitrifying bacteria in the soil break down nitrates and return nitrogen to the air. This is usually in waterlogged soil. Hence, making it unavailable for plant roots. So, the correct option is 'Denitrifying bacteria'