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. **Understand the Question**: We need to identify the phytohormone that enables seeds to endure dry conditions and other adverse environmental factors.

2. **Review the Options**: The options provided are:
- Ethylene
- Auxin
- Gibberellin
- Abscisic Acid (ABA)

3. **Analyze Each Option**:
- **Ethylene**: This hormone is primarily associated with the ripening of fruits and the aging process in plants. It does not play a significant role in helping seeds withstand unfavorable conditions.
- **Auxin**: This hormone is involved in cell elongation and development. It is not specifically related to seed dormancy or resilience against desiccation.
- **Gibberellin**: This hormone promotes growth and flowering in plants. It is not known for helping seeds withstand adverse conditions.
- **Abscisic Acid (ABA)**: This hormone is known as a growth inhibitor. It plays a crucial role in helping plants and seeds cope with stress conditions, including drought. ABA induces seed dormancy and helps seeds to remain viable during unfavorable conditions.

4. **Select the Correct Answer**: Based on the analysis, the correct phytohormone that helps seeds withstand desiccation and other unfavorable conditions is **Abscisic Acid (ABA)**.

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

---