Which of the following plant activity is not an example of growth promotion activity?

Options

A. Germination of seeds
B. Cell division
C. Delay in senescence
D. Abscission

Answer

To determine which plant activity is not an example of growth promotion activity, we will analyze the roles of various plant hormones and their effects on plant growth.

### Step-by-Step Solution:

1. **Understand Plant Growth Regulators**:
- Plant growth regulators, also known as plant hormones or phytohormones, are substances that control various activities in plants. They can be classified into two main categories: growth promoters and growth inhibitors.

2. **Identify Growth Promoters**:
- Growth promoters are hormones that stimulate growth and development in plants. Examples include:
- **Auxins**: Promote cell elongation and are involved in various growth processes.
- **Gibberellins**: Promote stem elongation, seed germination, and flowering.
- **Cytokinins**: Promote cell division and shoot formation.

3. **Identify Growth Inhibitors**:
- Growth inhibitors are hormones that suppress growth or induce dormancy. An important example is:
- **Abscisic Acid (ABA)**: This hormone is associated with stress responses, dormancy, and leaf abscission (the process of leaves falling off).

4. **Analyze the Options**:
- The question asks for an activity that is not a growth promotion activity. Among the options provided, we need to identify which one falls under the category of growth inhibitors.

5. **Identify the Correct Answer**:
- If one of the options is "abscission," this is the process by which leaves fall off the plant, and it is regulated by abscisic acid. Since abscission is associated with growth inhibition and stress responses, it is not a growth promotion activity.

### Conclusion:
The plant activity that is not an example of growth promotion activity is **abscission**.

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