Assertion : The nitrogen-fixing bacteria in leguminous plant nodules live as symbionts.
Reason : Leg-haemoglobin synthesized by leguminous plants protect bacteria

Options

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B. If both the assertion and the reason are true and the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If both the assertion and reason are false

Answer

a

Explanation

Rhizobium from a symbiotic association with roots of leguminous plants producing root nodules. These bacteria reside inside the nodules and reduce atmospheric nitrogen `(N_(2))` to ammonia. The fixed nitrogen is taken up by plant. In return the plant provides nuterients both and protection to bacteria.