Cytokinins have specific effect on

Options

A. parthenocarpy
B. cytokinesis
C. flowering
D. dormancy

Answer

**Step-by-Step Solution:**

1. **Understanding Cytokinins**: Cytokinins are a class of plant hormones that play a crucial role in various aspects of plant growth and development. They are primarily involved in cell division and differentiation.

2. **Specific Effects of Cytokinins**: The question asks about the specific effects of cytokinins. They are known to have a significant impact on several processes, including:
- Cytokinesis (the process of cell division)
- Delaying senescence (aging) in plants
- Mobilizing nutrients within the plant

3. **Cytokinesis**: Among the options provided (parthenocarpy, cytokinesis, flowering, and dormancy), cytokinins are specifically known for their role in cytokinesis. They promote cell division, which is essential for growth and development.

4. **Other Processes**:
- **Parthenocarpy**: This process, which refers to the development of fruit without fertilization, is primarily regulated by auxins, not cytokinins.
- **Flowering**: While cytokinins can influence flowering indirectly, they are not the primary hormones responsible for initiating flowering. Other hormones, such as gibberellins and auxins, play more significant roles.
- **Dormancy**: The dormancy of seeds and buds is mainly regulated by abscisic acid (ABA), not cytokinins.

5. **Conclusion**: Based on the specific effects of cytokinins, the correct answer to the question is that cytokinins have a specific effect on cytokinesis.

**Final Answer**: Cytokinins have a specific effect on cytokinesis.

---