Which of the following crops, when grown in rotation with wheat, adds nitrogen to the soil through bacteria living in its root nodules?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Gram
Gram is a pulse (a leguminous crop). Rhizobium bacteria in its root nodules fix nitrogen from the air, so the soil is richer in nitrogen for the next crop. Maize, barley and cotton do not have such nodules.