Find out the growth inhibitor and an inhibitor of plant metabolism is

Options

A. auxin
B. gibberellin
C. abscisic acid
D. cytokinin

Answer

To find out the growth inhibitor and an inhibitor of plant metabolism, we need to analyze the different plant growth regulators mentioned: auxin, zyberlin, abscisic acid (ABA), and cytokinin.

### Step-by-Step Solution:

1. **Understanding Plant Growth Regulators**:
- Plant growth regulators are classified into two categories: those that promote growth and those that inhibit growth.

2. **Identifying Growth Promoters**:
- Auxin, zyberlin, and cytokinin are known as growth promoters.
- Auxin is involved in processes like apical dominance and cell elongation.
- Zyberlin is associated with seed germination and increasing internodal length.
- Cytokinin promotes cell division and growth.

3. **Identifying Growth Inhibitors**:
- Abscisic acid (ABA) is recognized as a growth inhibitor.
- It plays a crucial role in inhibiting growth, promoting dormancy, and is often referred to as a stress hormone.
- ABA is responsible for closing stomata, which helps the plant conserve water during stress conditions.

4. **Conclusion**:
- The growth inhibitor is **Abscisic Acid (ABA)**, and it inhibits plant metabolism by inducing dormancy and closing stomata.

### Final Answer:
- The growth inhibitor is **Abscisic Acid (ABA)**, which also acts as an inhibitor of plant metabolism.