Which of these is not a postulate of the cell theory ?

Options

A. All organisms are made up of one or more cells .
B. The cell is the basic structural and functional unit of all organisms
C. Cells once formed, never die or get depleted
D. New cells arise from old cells

Answer

To determine which of the given options is not a postulate of the cell theory, we can analyze each option based on the established principles of the cell theory.

### Step-by-Step Solution:

1. **Understanding Cell Theory**:
The cell theory is a fundamental concept in biology that outlines the properties and functions of cells. It was developed by scientists such as Schleiden and Schwann.

2. **Reviewing the Postulates of Cell Theory**:
The main postulates of cell theory are:
- All living organisms are made up of one or more cells.
- The cell is the basic structural and functional unit of life.
- All cells arise from pre-existing cells.

3. **Analyzing Each Option**:
- **Option A**: "All organisms are made up of one or more cells."
- This is a postulate of cell theory.
- **Option B**: "A cell is a basic structural and functional unit of all cells."
- This is also a postulate of cell theory.
- **Option C**: "Cells once formed never die or get depleted."
- This statement is incorrect as cells can die or deplete over time. Therefore, this is not a postulate of cell theory.
- **Option D**: "New cells arise from older cells."
- This is a postulate of cell theory.

4. **Conclusion**:
The option that is not a postulate of the cell theory is **Option C**: "Cells once formed never die or get depleted."