Assertion: Cytokinin are antisenescent.
Reason : Effects of cytokinins is antagonistic to ethylene.

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 reason are true but 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

B

Explanation

Cytokinin delays the senescence (ageing) of leaves and other organs by controlling protein synthesis and mobilization of nutrients as a resource which is an antagonist to ethylene. Ethylene promotes senescence of plant parts like leaves, flowers. It has been found that hay senescence is largely caused by ethylene.