What is the cause of cell division ?

Options

A. Increase in surface area/volume ratio due to growth of cell.
B. Nucleo-cytoplasmic ratio decreases due to increase in size of cell.
C. Disturbance in lipid and protein ratio
D. All of the above

Answer

### Step-by-Step Text Solution:

1. **Understanding Cell Division**: Cell division is a fundamental process by which a single cell divides to form two new daughter cells. It is essential for growth, development, and repair in organisms.

2. **Causes of Cell Division**: The primary causes of cell division include:
- **Increase in Surface Area to Volume Ratio**: As a cell grows, its volume increases faster than its surface area. This affects the efficiency of nutrient uptake and waste elimination, prompting the cell to divide.
- **Nucleocytoplasmic Ratio (NC Ratio)**: This ratio is the relationship between the size of the nucleus and the cytoplasm. As cells grow larger, the NC ratio decreases, which can trigger cell division to maintain proper cellular function.
- **Disturbance of Lipid and Protein Ratios**: Changes in the composition of cellular components can also signal the need for division.

3. **Types of Cell Division**: There are two main types of cell division:
- **Equational Division**: This type maintains the chromosome number (e.g., mitosis).
- **Reductional Division**: This type reduces the chromosome number by half (e.g., meiosis).

4. **Conclusion**: The causes of cell division are multifaceted, involving the increase in surface area to volume ratio, the decrease in nucleocytoplasmic ratio, and disturbances in lipid and protein ratios. All these factors work together to regulate when and how a cell divides.