Rate of cell div. increases by application of:-

Options

A. Cytokinisis
B. Auxins
C. Gibberellins
D. Colchicine

Answer

To solve the question regarding which application increases the rate of cell division, we will analyze the options provided:

1. **Identify the options**: The question provides several plant growth hormones. We need to determine which of these hormones increases the rate of cell division.

2. **Evaluate each option**:
- **Cytokinins**: This hormone is known to promote cell division in plants. It encourages the growth of shoots and roots and is directly linked to increasing the rate of cell division. Therefore, this option is correct.
- **Auxins**: While auxins are important for plant growth, they primarily promote cell elongation rather than division. Thus, this option does not increase the rate of cell division.
- **Gibberellins**: These hormones are mainly involved in seed germination and stem elongation. They do not play a significant role in increasing cell division. Therefore, this option is also incorrect.
- **Colchicine**: This compound is known to inhibit cell division by disrupting the spindle formation during mitosis. Hence, it does not increase the rate of cell division and is an incorrect option.

3. **Conclusion**: Based on the analysis, the correct answer is **Cytokinins**, as they are the only option that increases the rate of cell division.

### Final Answer:
The rate of cell division increases by the application of **Cytokinins**.