Question

A crop plant which can grow well even in nitrogen deficient soil is

• A. Helianthus campestris
• B. Gossypium herbaceum
• C. Brassica campestris
• D. Cajanus cajan

Answer 1

Answer: (D)

Cajanus cajan

Fabaceae members contain bacteria in their roots within the root nodules. These bacteria, known as Rhizobia, takes nitrogen gas (N${}_2$) out of the air and converts it to nitrate or ammonia that is used by the host plant. This process is called as nitrogen fixation. Rhizobia are in symbiotic association with the plants. Due to this, a plant can grow in nitrogen-deficient soil e.g., Cajanus cajan. Cajanus cajun is leguminous plant belongs to the family Leguminosae.

Thus, the correct answer is option D.