Question

Root nodules are found in

• A. Some leguminous plants only
• B. In all plants
• C. Some leguminous plants and some other plants also
• D. All leguminous plants but never in other plants

Answer 1

The correct option is C Some leguminous plants and some other plants also

Leguminous plants are in symbiotic association with nitrogen-fixing bacteria like Rhizobium. These bacteria invade root hairs of leguminous plants and forms root nodules in which they fix nitrogen. Rood nodules are found in some other plants also apart from leguminous plants. A red pigment present in the root nodules of leguminous plants is known as leghaemoglobin.

Thus, the correct answer is 'Some leguminous plants and some other plants also.'