Phytohormone that helps seeds to withstand desiccation and other unfavourable conditions is

Options

A. Ethylene
B. Auxin
C. Gibberellin
D. ABA

Answer

To solve the question regarding which phytohormone helps seeds withstand desiccation and other unfavorable conditions, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Context**: The question is about phytohormones, which are plant hormones that regulate various physiological processes in plants, including growth, development, and responses to environmental stress.

2. **Understand the Role of Phytohormones**: Different phytohormones have specific functions. For example:
- **Ethylene**: Primarily involved in fruit ripening.
- **Auxin**: Promotes cell elongation and growth.
- **Gibberellin**: Stimulates stem elongation and seed germination.

3. **Focus on Seed Desiccation and Stress Conditions**: The question specifically asks about a hormone that helps seeds survive unfavorable conditions, particularly desiccation (drying out).

4. **Identify the Correct Phytohormone**: The hormone that is known to help seeds withstand desiccation and prevent germination under unfavorable conditions is **Abscisic Acid (ABA)**.
- ABA plays a crucial role in signaling stress responses in plants, particularly during drought conditions.

5. **Confirm the Answer**: Based on the functions of the different phytohormones discussed, we can confirm that the correct answer to the question is **Abscisic Acid**.

### Final Answer:
The phytohormone that helps seeds to withstand desiccation and other unfavorable conditions is **Abscisic Acid**.

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