Abcisic acid promotes

Options

A. Cell division
B. Leaf fall senescence and dormacy
C. Shoot elongation
D. Cell elongation and formation

Answer

**Step-by-Step Solution:**

1. **Understanding Abscisic Acid (ABA):**
- Abscisic acid is a plant hormone known as ABA. It is primarily recognized as a stress hormone.

2. **Role During Water Stress:**
- One of the key functions of abscisic acid is to help plants cope with water stress. It does this by promoting the closure of stomata, which are small openings on the leaf surface that allow for gas exchange.

3. **Effects on Seed and Bud Dormancy:**
- Abscisic acid also plays a significant role in promoting dormancy in seeds and buds. This dormancy is crucial for survival during unfavorable conditions.

4. **Promotion of Leaf Fall:**
- In addition to its roles in water stress and dormancy, abscisic acid is involved in the process of leaf senescence (aging) and leaf fall (abscission). It signals the plant to shed leaves, which can be beneficial in conserving water and energy.

5. **Conclusion:**
- Based on the functions of abscisic acid, we can conclude that it promotes leaf fall, senescence, and dormancy. Therefore, the correct answer to the question is that abscisic acid promotes leaf fall, senescence, and dormancy.

**Final Answer:**
Abscisic acid promotes leaf fall, senescence, and dormancy.

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