Which phytohormone functions as a plant growth inhibitor?

Explanation

**Step-by-Step Solution:**

1. **Understanding Phytohormones:**
- Phytohormones, also known as plant growth regulators (PGRs), are chemicals that regulate various physiological processes in plants, including growth, development, and responses to environmental stimuli.

2. **Identifying Growth Inhibitors:**
- Among the various phytohormones, some promote growth while others inhibit it. It is essential to identify which hormone acts as a growth inhibitor.

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