Which among the following crops helps in restoring soil fertility by fixing nitrogen from the air?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Pulses **
Pulses have root nodules containing Rhizobium bacteria, which fix atmospheric nitrogen into the soil, thereby restoring soil fertility.
Millets and sugarcane do not fix nitrogen. (Rajma is a type of pulse, but the correct general category is pulses.)