Question

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

• A. If both the assertion and 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 reaon is false
• D. If both the assertion and reason are false
• E. If the assertion is false but reason is true

Answer 1

The correct option is B If both the assertion and reason are true but the reason is not a correct explanation of the assertion

When cytokinins are added directly to the abscission layer, senescence of the zone is retarded. This delays the degradation of protein and chlorophyll of the plant parts and hence delays senescence. As they act as anti senescent, they act as antagonistic to ethylene which accelerates senescence.

So, the correct answer is 'If both the assertion and reason are true but the reason is not a correct explanation of the assertion'