The role of ethylene and abscissic acid is both positive and negative justify the statement

Explanation

**Step-by-Step Solution:**

1. **Introduction to Ethylene and Abscisic Acid:**
- Ethylene and abscisic acid are both plant hormones that play crucial roles in plant growth and development. They can have both positive and negative effects on plants.

2. **Positive Effects of Ethylene:**
- **Apical Dominance:** Ethylene promotes apical dominance, which encourages vertical growth and helps the plant grow taller.
- **Breaking Seed Dormancy:** Ethylene is responsible for breaking the dormancy of seeds, allowing them to germinate.
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