What is the role of abscisic acid on abscission?

Explanation

### Step-by-Step Solution:

1. **Introduction to Abscisic Acid (ABA)**:
- Abscisic acid is a plant hormone that plays a crucial role in various physiological processes, including abscission, which is the process of shedding leaves, flowers, or fruits.

2. **Role in Abscission**:
- Abscisic acid regulates the abscission process by promoting the detachment of plant parts. It helps in signaling the plant to shed leaves or fruits, especially in response to environmental stress.

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