Question

What is the primary outcome of the Legume–Rhizobium symbiosis in terms of soil enrichment?

Options

• Protection of plants from fungal pathogens only

• Formation of root nodules that fix large amounts of nitrogen and enrich the soil for subsequent crops

• Direct supply of chemical phosphates to plant roots

• Conversion of insoluble phosphates into soluble forms

Answer 1

The Legume–Rhizobium symbiosis results in the formation of root nodules where large amounts of atmospheric nitrogen are fixed into usable forms. This biologically fixed nitrogen enriches the soil and benefits subsequent crops grown in the same field, making it one of the most significant biological nitrogen fixation systems.