NEETBotanyPlant - Growth and Development
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Application of cytokinins helps in retaining the green colour of leaves for a longer period. Reason (R): Cytokinins promote nutrient mobilisation which helps in the delay of leaf senescence. In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- BBoth (A) and (R) are correct and (R) is the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
B. Both (A) and (R) are correct and (R) is the correct explanation of (A)
Step-by-step solution
Assertion (A) is correct because cytokinins delay the process of leaf senescence, thereby keeping the leaves green for a longer duration. Reason (R) is also correct and provides the physiological basis for this effect. According to NCERT, cytokinins promote nutrient mobilisation which helps in the delay of leaf senescence. Thus, the nutrient mobilisation is the direct cause of the delayed senescence. Therefore, both (A) and (R) are correct and (R) is the correct explanation of (A). Answer: Both (A) and (R) are corr