Question

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

• 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 reason are true but the reason is
  not a correct explanation of the assert!on
• C. If the assertion ts true but the reason !s false
• D. If both the assertion and reason are false

Answer 1

The correct option is A If both the assertion and the reason are true and the reason

is a correct explanation of the assertion
Rhizobium form 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 nutrients both and protection to bacteria.