Why are pulse crops considered useful in agriculture?

Correct answer: They are a source of protein

The direct answer is A: pulses are a source of protein. Pulses are the edible seeds of legume plants, such as lentils, chickpeas, peas and many beans. The reasoning is: the seeds contain valuable plant nutrients; when people eat pulses, they receive substantial plant protein; protein helps build and repair body tissues and supports normal growth; therefore pulses are useful both nutritionally and agriculturally. Option A is correct because protein is an important contribution of pulses to the diet. Option B is wrong because pulses are food crops, not merely decoration. Option C is impossible and wrong because growing pulses does not turn soil into plastic. Option D is wrong because pulses are directly related to food and nutrition. Legume crops may also enrich soil by working with certain root bacteria that help add nitrogen, but that additional fact does not replace the main answer asked here. Memory cue: “dal = protein”; connect pulses with body-building nutrition, not decoration or manufactured materials.