Question

How does Rhizobium act as a biological fertiliser ?

• A. It provides phosphorus to the plants
• B. It provides humus to the soil
• C. It fixes atmospheric nitrogen and provides it to plants.
• D. It provides oxygen to the roots of the soil

Answer 1

The correct option is C

It fixes atmospheric nitrogen and provides it to plants.

Rhizobium is a nitrogen fixing bacteria which live in soil and are able to fix atmospheric nitrogen. The free nitrogen gets converted into organic forms such as nitrates, nitrites and ammonia, which can now be used by plants.