Identify the correct statement regarding cytokinins.
I. Cytokinins induce cell division .
II. Cytokinins delay the onset of senescence.
III. Cytokinins initiate chloroplast formation in the presence of light .
IV. Application of Cytokinins reduces the apical dominance and stimulates the growth of lateral buds.

Options

A. I,II , III and IV
B. I,II and III
C. I and IV
D. I and III

Answer

To identify the correct statements regarding cytokinins, we will analyze each statement one by one based on our understanding of cytokinins and their functions in plants.

### Step-by-Step Solution:

1. **Statement I: Cytokinins induce cell division.**
- Cytokinins are known to promote cell division in plant tissues. They are primarily involved in the growth and development of new cells, especially in areas of rapid growth such as the tips of roots and shoots.
- **Conclusion:** This statement is **correct**.

2. **Statement II: Cytokinins delay the onset of senescence.**
- Senescence refers to the aging process in plants, which can lead to the dropping of leaves and fruits. Cytokinins have been shown to delay this process, allowing for longer retention of leaves and fruits, thus promoting better growth and development.
- **Conclusion:** This statement is **correct**.

3. **Statement III: Cytokinins initiate chloroplast formation in the presence of light.**
- Cytokinins play a role in the differentiation of cells, including the formation of chloroplasts, which are essential for photosynthesis. They help in the development of chloroplasts, especially when light is available, as light is crucial for photosynthesis.
- **Conclusion:** This statement is **correct**.

4. **Statement IV: Application of cytokinins reduces apical dominance and stimulates the growth of lateral buds.**
- Apical dominance is the phenomenon where the main central stem of the plant grows more strongly than the side stems. Cytokinins can reduce this dominance, allowing lateral buds to grow more freely, which is beneficial for bushier plant growth.
- **Conclusion:** This statement is **correct**.

### Final Conclusion:
All four statements about cytokinins are correct. Therefore, the correct answer is that all statements (I, II, III, IV) regarding cytokinins are true.