Question

'Nif' gene for nitrogen fixation in cereal crops like wheat, jowar etc., is introduced by cloning.

• A. Rhizobium meliloti
• B. Bacillus thuringiensis
• C. Rhizopus stolonifer
• D. Agrobacterium tumefaciens

Answer 1

Answer: (A)

Rhizobium meliloti

'Nif' genes are genes encoding enzymes involved in the fixation of atmospheric nitrogen into a form of nitrogen available to living organisms. The primary enzyme is encoded by nif gene is the nitrogenase complex which is in charge of converting atmospheric nitrogen to ammonia. It is used in cereal crops like wheat, jowar etc. and introduced by cloning of nitrogen fixing bacteria like Rhizobium meliloti.
So, the correct option is option A.