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Select the PGR, which promote rapid inte...

Select the PGR, which promote rapid internode or petiole elongation in deep water rice plants.

A

ABA

B

ethylene

C

auxin

D

GA

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks for a plant growth regulator (PGR) that promotes rapid internode or petiole elongation specifically in deep water rice plants. 2. **Identifying the Options**: The options provided are: - ABA (Abscisic Acid) - Ethylene - Auxin - GA (Gibberellins) 3. **Analyzing Each PGR**: - **ABA (Abscisic Acid)**: This hormone is known as the stress hormone. Its primary functions include closing stomata and inducing dormancy, which are not related to promoting elongation. - **Ethylene**: This hormone is primarily associated with fruit ripening and also promotes rapid internode and petiole elongation in deep water rice plants. - **Auxin**: This hormone is primarily responsible for apical dominance and the development of fruits without fertilization (parthenocarpy), but it does not specifically promote rapid elongation in deep water rice. - **GA (Gibberellins)**: This group of hormones is known to increase internodal length and promote germination, but they are not specifically noted for rapid elongation in deep water rice. 4. **Conclusion**: Based on the analysis, the plant growth regulator that promotes rapid internode or petiole elongation in deep water rice plants is **Ethylene**. 5. **Final Answer**: The correct answer is Ethylene. ---
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