Improvement in Food Resources — Science STD 9 — Question

The importance of pulses and other legumes in farming is derived from the fact that they have the ability to fix atmospheric nitrogen into the soil.
Unlike other crops, that use up nitrogen in soil, pulses and other legumes are able to fix nitrogen in the soil-important for plant growth.
Hence, the legumes are incorporated into crop rotation system to revive the depleted stock of nitrogen in the soil.