Question

How is Rhizobium useful to farmers?

• A. They help in nitrogen fixation in the soil.
• B. They help in killing pests.
• C. They make the soil airy, soft and fertile.
• D. They help in pulling out of weeds.

Answer 1

The correct option is A They help in nitrogen fixation in the soil.

Rhizobium fixes nitrogen in symbiotic association with roots of leguminous plants. Initially, the bacteria grow in soil near the roots of higher plants where they fail to fix the nitrogen. These bacteria when coming in contact with leguminous plants, interact chemically and enter into roots through root hairs, and fix nitrogen by symbiotic association.

Thus, the correct answer is option A.