Cell division is initiated by

Options

A. Cytokinin
B. Auxin
C. Gibberellin
D. ABA

Answer

**Step-by-Step Solution:**

1. **Understanding Cell Division**: Cell division is a fundamental process in biology where a single cell divides to form two daughter cells. This process is crucial for growth, development, and tissue repair in organisms.

2. **Role of Hormones in Cell Division**: Various plant hormones regulate cell division. Among these, cytokinins play a significant role in promoting cell division and tissue growth.

3. **Cytokinins and Auxins**: Cytokinins work in conjunction with auxins to regulate plant growth. The balance between these two hormones is critical. A higher ratio of cytokinins to auxins stimulates stem and leaf growth.

4. **Other Hormones**:
- **Gibberellins**: These hormones are involved in various developmental processes such as stem elongation, germination, and flowering but do not initiate cell division.
- **Auxins**: While auxins are important for growth, they do not directly initiate cell division.
- **Abscisic Acid (ABA)**: This hormone is involved in processes like seed dormancy and does not initiate cell division.

5. **Conclusion**: Based on the roles of these hormones, the initiation of cell division is primarily attributed to cytokinins.

**Final Answer**: Cell division is initiated by cytokinins.

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