Question

Genes related to module formation are present in

• A. Legume plant and rhizobium
• B. Legume plant only
• C. Rhizobium only
• D. None of these

Answer 1

The correct option is A Legume plant and rhizobium

Root nodules are found on the roots of plants, primarily legumes, that form a symbiosis with nitrogen-fixing bacteria. Under nitrogen-limiting conditions, capable plants form a symbiotic relationship with a host-specific strain of bacteria known as rhizobia. Nitrogen fixation in the nodule is very oxygen sensitive. Legume nodules harbour an iron-containing protein called leghaemoglobin, closely related to animal myoglobin, to facilitate the diffusion of oxygen gas used in respiration. They contain symbiotic bacteria called rhizobia within the nodules, producing nitrogen compounds that help the plant to grow and compete with other plants.

So the correct answer is 'Legume plant and rhizobium'.