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PGR that helps in delaying 'senescence' ...

PGR that helps in delaying 'senescence' is.

A

auxins

B

gibberellins

C

ethylene

D

ABA

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks for a plant growth regulator (PGR) that helps in delaying senescence, which is the process of aging in plants. 2. **Evaluating Options**: - **Option 1: Auxin**: Auxins are known for promoting apical dominance and cell elongation, but they do not delay senescence. Therefore, this option is incorrect. - **Option 2: Gibberellins**: Gibberellins are a class of PGRs that promote growth and can delay senescence in plants. They are known to help in extending the life of leaves and other plant parts. This option is correct. - **Option 3: Ethylene**: Ethylene is a plant hormone that promotes fruit ripening and can actually promote senescence. Thus, this option is incorrect. - **Option 4: Abscisic Acid**: Abscisic acid is primarily involved in seed dormancy and stress responses. It does not delay senescence, making this option incorrect as well. 3. **Conclusion**: After evaluating all options, the correct answer is **Gibberellins**, as they are the PGR that helps in delaying senescence. **Final Answer**: Gibberellins ---
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