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Which of the following statements are co...

Which of the following statements are correct?
I. Both growth and differentiation in higher plants are open
II. Ethylene prevents rapid internodal or petiole elongation in deep water rice plants
III. ABA induces seed germination
IV. A defoliated plant can not respond to photoperiodic cycle

A

I, IV only

B

I, III, IV only

C

III, IV only

D

I, II, III, IV

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements are correct, let's analyze each statement one by one. ### Step 1: Analyze Statement I **Statement I**: Both growth and differentiation in higher plants are open. - In higher plants, growth and differentiation are indeed open processes. This means that plants can continue to grow and differentiate throughout their life due to the presence of meristematic tissues, which are capable of continuous cell division. Therefore, this statement is **correct**. ### Step 2: Analyze Statement II **Statement II**: Ethylene prevents rapid internodal or petiole elongation in deep water rice plants. - Ethylene is known to play a role in plant growth, but in the case of deep water rice plants, it is gibberellins that promote rapid internodal and petiole elongation. Ethylene does not prevent this elongation; therefore, this statement is **incorrect**. ### Step 3: Analyze Statement III **Statement III**: ABA induces seed germination. - Abscisic acid (ABA) is actually known to inhibit seed germination. It promotes dormancy and helps seeds to withstand unfavorable conditions. Therefore, this statement is **incorrect**. ### Step 4: Analyze Statement IV **Statement IV**: A defoliated plant cannot respond to the photoperiodic cycle. - Defoliation can affect a plant's ability to respond to photoperiodic signals because leaves are crucial for perceiving light and initiating the flowering process. Therefore, this statement is **correct**. ### Conclusion: Based on the analysis: - Statement I: Correct - Statement II: Incorrect - Statement III: Incorrect - Statement IV: Correct The correct statements are **I and IV**. ### Final Answer: The correct statements are I and IV. ---
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