Hormone responsible for plant and seed dormancy during drought is

Options

A. IBA
B. NAA
C. ABA
D. Zeatin.

Answer

**Step-by-Step Solution:**

1. **Understanding Plant Hormones**: Plant hormones are chemical substances that regulate various aspects of growth and development in plants. They play crucial roles in response to environmental stresses.

2. **Identifying Stress Hormones**: Stress hormones are produced by plants in response to adverse environmental conditions, such as drought or extreme temperatures. They help plants cope with these stresses.

3. **Recognizing Abscisic Acid (ABA)**: Among the various plant hormones, Abscisic Acid (ABA) is specifically known as a stress hormone. It is produced in higher concentrations during stressful conditions, particularly drought.

4. **Function of Abscisic Acid**: ABA plays a key role in promoting seed dormancy and reducing water loss by causing stomatal closure. This helps the plant conserve water during drought conditions.

5. **Conclusion**: Given the options provided (IBA, NAA, ABA, Zeatin), the hormone responsible for plant and seed dormancy during drought is Abscisic Acid (ABA).

**Final Answer**: The hormone responsible for plant and seed dormancy during drought is **Abscisic Acid (ABA)**.

---