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): Ethylene promotes rapid internode and petiole elongation in deep water rice plants. Reason (R): It helps the leaves or upper parts of the shoot to remain above water. In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not 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
A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
Step-by-step solution
Both Assertion (A) and Reason (R) are correct statements. According to NCERT, ethylene is a gaseous hormone that promotes rapid internode or petiole elongation in deep water rice plants. The biological significance of this physiological effect is to help the leaves or upper parts of the shoot to remain above water. Therefore, Reason (R) correctly explains the adaptive significance of the phenomenon described in Assertion (A). Answer: Both (A) and (R) are correct and (R) is the correct explanation of (A)