Natural cytokinins are synthesised in tissues that are

Options

A. Strong food
B. Differentiating
C. Dividing
D. Senescent.

Answer

### Step-by-Step Solution:

1. **Understanding Cytokinins**:
- Cytokinins are a class of plant hormones that play a crucial role in promoting cell division and growth in plants. They are involved in various physiological processes, including the regulation of cell division and differentiation.

2. **Location of Synthesis**:
- Natural cytokinins are synthesized in specific tissues of the plant. The key point to note is that these tissues are typically involved in active growth and division.

3. **Identifying the Correct Tissue Type**:
- The question asks where natural cytokinins are synthesized. The tissues that are primarily involved in cell division are those that are actively growing, such as the cambium layer in plants.

4. **Analyzing the Options**:
- The options provided include:
- Strong food
- Differentiating
- Dividing
- Senescent
- Among these options, we need to identify which one corresponds to tissues that are actively dividing.

5. **Evaluating Each Option**:
- **Strong food**: This does not relate to tissue types; hence, it is incorrect.
- **Differentiating**: While differentiation is a process that occurs in plant growth, it does not imply active division. Therefore, this option is also incorrect.
- **Dividing**: This option refers to tissues that are actively undergoing cell division, such as the cambium, making it the correct choice.
- **Senescent**: This refers to aging tissues that are not actively dividing, so it is incorrect.

6. **Conclusion**:
- Based on the analysis, the correct answer is that natural cytokinins are synthesized in tissues that are **dividing**.