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

Options

A. ABA and auxin
B. Ethylene and ABA
C. Ethylene and gibberellic acid
D. Gibberellic acid and ABA

Answer

To solve the question regarding which hormones are responsible for petiole elongation in deepwater rice plants and the stimulation of stomatal closure, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Functions of the Hormones**:
- We need to determine which hormone is responsible for petiole elongation in deepwater rice plants.
- Additionally, we need to identify the hormone that stimulates the closure of stomata.

2. **Research the Hormones**:
- **Ethylene**: This is a gaseous plant hormone known to promote growth processes such as fruit ripening and elongation of stems and petioles. It is particularly important in deepwater rice plants for promoting internode elongation, which helps the plant reach the water surface.
- **Abscisic Acid (ABA)**: This hormone is often referred to as the stress hormone. It plays a crucial role in plant responses to stress, particularly water stress. ABA is known to stimulate the closure of stomata to reduce water loss through transpiration.

3. **Match the Functions with the Hormones**:
- Based on the functions identified:
- The hormone responsible for petiole elongation in deepwater rice is **Ethylene**.
- The hormone that stimulates the closure of stomata is **Abscisic Acid (ABA)**.

4. **Select the Correct Pair from the Options**:
- The options given are:
- ABA and Auxin
- Ethylene and ABA
- Ethylene and Zyberlic Acid
- Zyberlic Acid and ABA
- From our analysis, the correct pair that matches the functions is **Ethylene and ABA**.

### Final Answer:
The hormones responsible for petiole elongation in deepwater rice plants and the stimulation of stomatal closure are **Ethylene and Abscisic Acid (ABA)**, respectively.

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