Question

What happened when wheat field decreases with Rhizobium?

• A. No increase in production/nitrogen contents of soil
• B. Fertility of soil increases
• C. Fertility of soil decreases
• D. Increase in production and nitrogen contents of soil

Answer 1

The correct option is A No increase in production/nitrogen contents of soil

Rhizobia are soil bacteria that help in fixing of nitrogen for the leguminous plant (Fabaceae). They fix nitrogen after becoming established inside root nodules of the plants. If the wheat field decreases with the rhizobium then the nitrogen fixation will stop which will reduce the nitrogen contents in soil due to which there is no increase in the production of wheat.

Thus the correct option is A.