Which one is growth regulator produced by plants

Options

A. NAA
B. Zeatin
C. 2, 4-D
D. BAP.

Answer

To determine which growth regulator is produced by plants, let's analyze the options provided:

1. **Naphthalene Acetic Acid (NAA)**:
- NAA is a synthetic auxin, which means it is artificially created and not naturally occurring in plants. Therefore, it cannot be the correct answer.

2. **Zeatin**:
- Zeatin is a type of cytokinin that is naturally occurring. It was first discovered in maize (corn) and is produced by plants. This makes it a suitable candidate for the correct answer.

3. **2,4-Dichlorophenoxyacetic Acid (2,4-D)**:
- 2,4-D is also a synthetic auxin, similar to NAA. It is commonly used as a herbicide and is not naturally occurring in plants. Thus, this option is incorrect.

4. **Benzylaminopurine (BAP)**:
- BAP is a synthetic cytokinin. It is not found naturally in plants, making this option incorrect as well.

After evaluating all the options, the only growth regulator that is produced naturally by plants is **Zeatin**.

### Final Answer:
**Zeatin** is the growth regulator produced by plants.