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One hormone helps in petiole elongation ...

One hormone helps in petiole elongation in deepwater rice plants, while the other stimulates closure of stomata. These are respectively:

A

ABA and auxin

B

Ethylene and ABA

C

Ethylene and gibberellic acid

D

Gibberellic acid and ABA

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding which hormones are responsible for petiole elongation in deepwater rice plants and the closure of stomata, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Functions of the Hormones**: - We need to determine which hormones are involved in petiole elongation and stomatal closure. 2. **Petiole Elongation in Deepwater Rice**: - In deepwater rice plants, the hormone responsible for petiole elongation is **ethylene**. Ethylene promotes growth in response to flooding, allowing the plant to elongate its petioles to reach the water surface. 3. **Stomatal Closure**: - The hormone that stimulates the closure of stomata is **abscisic acid (ABA)**. ABA is known as the stress hormone and is released in response to water stress, leading to the closure of stomata to reduce water loss through transpiration. 4. **Match the Hormones to the Options**: - Now we can look at the options provided: - **ABA and auxin** - **ethylene and ABA** - **ethylene and gibberellic acid** - **gibberellic acid and ABA** - From our findings, the correct pairing is **ethylene** (for petiole elongation) and **ABA** (for stomatal closure). 5. **Conclusion**: - Therefore, the correct answer to the question is **ethylene and ABA**. ### Final Answer: The hormones that help in petiole elongation in deepwater rice plants and stimulate closure of stomata are **ethylene and abscisic acid (ABA)**, respectively. ---
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