Question

why do leguminous plants have root nodules

Answer 1

leguminous plants have root nodules. the reason behind this is that the root nodules have certain bacteria which can can convert atmospheric nitrogen into into soil soluble format which has the plant to grow more easily.

Answer 2

The root nodules of leguminous plants contain nitrogen-fixing bacteria, e,g clover, peas. Farmers grow and then plough in leguminous plants into their fallow fields to enrich the soil with the nodules of fixed nitrogen, so that their crops will do better next time round. Places and soil where wild leguminous plants grow may lack nitrogen, essential to all plant growth.

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