ABA is involved in

Options

A. Shoot elongation
B. Increased cell division
C. Dormancy of seeds
D. Root elongation

Answer

### Step-by-Step Solution:

1. **Understanding the Role of Abscisic Acid (ABA)**:
- Abscisic acid (ABA) is a plant hormone that plays a crucial role in various physiological processes in plants. It is primarily known for its function as a growth inhibitor.

2. **Analyzing the Options**:
- The question provides four options regarding the functions of ABA:
- A) Shoot elongation
- B) Increased cell division
- C) Dormancy of seed
- D) Root elongation

3. **Evaluating Each Option**:
- **Option A: Shoot Elongation**:
- This function is primarily associated with auxins, not ABA. Therefore, this option is incorrect.
- **Option B: Increased Cell Division**:
- Cytokinins are the hormones responsible for promoting cell division, making this option incorrect as well.
- **Option C: Dormancy of Seed**:
- ABA is known to induce seed dormancy. It prevents seeds from germinating under unfavorable conditions, making this option correct.
- **Option D: Root Elongation**:
- Similar to shoot elongation, root elongation is also primarily influenced by auxins. Thus, this option is incorrect.

4. **Conclusion**:
- After evaluating all the options, the correct answer is **C) Dormancy of seed**. ABA is involved in inducing dormancy in seeds and axillary buds and acts as a stress hormone during adverse environmental conditions.