Question

Assertion : In Cycas, nitrogen fixation is found.

Reason : In coralloid roots of Cycas, cyanobacteria is present.

• A. Both A and R are true and R is the correct explanation of A
• B. Both A and R are true but R is not correct explanation of A
• C. A is true but R is false
• D. A and R are false

Answer 1

The correct option is A Both A and R are true and R is the correct explanation of A

Cycas forms mutualistic, facultative symbioses with nitrogen fixing cyanobacteria. Cycas provide fixed carbon and a stable environment in its coralloid roots to the cyanobacteria in exchange for fixed nitrogen.
Therefore both the assertion and reason are true and the reason is the correct explanation of the assertion.