Question

The cluster of genes, which regulate nodulation, of legume, possess, host specificity and are responsible for nitrogen fixation are

• A. Nod genes
• B. Nil genes
• C. Nod and Nil genes
• D. None a these

Answer 1

The correct option is A Nod genes

The genes responsible for fixation of nitrogen in legume plant is Nod gene. Nod factor or nodulation factor are produced by bacteria called rhizobia during initiation of nodules. A symbiosis relationship is formed when roots take up rhizobia. Rhizobia produces nitrogen for plants, and legume produces leghemoglobin to carry away oxygen, that would inhibit nitrogenase activity.

hence correct answer is option A.