Question

Why pulses are called leguminous crops

Answer 1

Because they have the bacteria Rhizobium , which helps in fixing free nitrogen from the air and helps to restore soil fertility.

Answer 2

Answer:

Pulses are called leguminous plants as in their roots they have rhizobia bacteria  present in the minor nodules. These are the bacteria which can remove atmospheric nitrogen which is in the soil.

Explanation:

Pules are the leguminous crops which converts atmospheric nitrogen into nitrites. Nitrites are used by plants as nutrients. It provides nutrients to the soil. Only the pulses plants have this ability and not the cereals plants hence these nutrients are used by the cereal plants too if they are planted nearby.