Analysis of growth at cellular level is done by:

Options

A. Increase in protoplasm
B. Increase in length
C. Increase in number
D. Increase in surface area

Answer

To analyze growth at the cellular level, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Cellular Growth**: Cellular growth refers to the increase in the size and number of cells within an organism. This growth is primarily associated with cell division.

2. **Identifying Key Components**: The analysis of cellular growth involves examining the protoplasm, which is the living substance within the cell. Protoplasm contains organelles and is crucial for cellular functions.

3. **Increase in Protoplasm**: The primary indicator of cellular growth is the increase in protoplasm. As protoplasm increases, it signifies that more organelles are present, and cellular functions are being carried out effectively. This increase is a direct result of cell division.

4. **Examining Other Options**:
- **Increase in Length**: Simply stretching a cell does not equate to cellular growth; it is merely an increase in length.
- **Increase in Number of Cells**: While the number of cells can increase through division, this alone does not define cellular growth without considering the protoplasm.
- **Increase in Surface Area**: Stretching or expanding the cell's surface area does not necessarily indicate growth at the cellular level.

5. **Conclusion**: The correct analysis of growth at the cellular level is best represented by the increase in protoplasm. Therefore, the answer to the question is the increase in protoplasm.

### Final Answer:
The analysis of growth at the cellular level is done by the increase in protoplasm.

---