Question

Cell in root nodule is promoted by:

• A. Auxin secreted by plant and Cytokinin secreted by bacteria
• B. Cytokinin secreted by plant and Auxin secreted by bacteria
• C. Auxin secreted by plants only
• D. Nitrogenase secreted by bacteria only

Answer 1

The correct option is A Auxin secreted by plant and Cytokinin secreted by bacteria

In the formation of root nodules, in leguminous plants, cortical cells in the root secrete auxins and cytokinins are secreted by Rhizobium bacteria. They promote cell division, gradually leads to the formation of root nodules.

So, the correct option is ‘Auxins secreted by plant and cytokinins secreted by bacteria’.