Assertion :- Simple diffusion does not follow saturation kinetics.
Reason:- Simple diffusion depends on concentration gradient

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Simple diffusion does not follow saturation kinetics."
- Saturation kinetics refers to a scenario where, at high substrate concentrations, the rate of transport reaches a maximum level and cannot increase further, typically seen in facilitated diffusion involving carrier proteins.

2. **Understanding the Reason**:
- The reason states that "Simple diffusion depends on concentration gradient."
- This means that the movement of molecules occurs from an area of higher concentration to an area of lower concentration, which is the fundamental principle of simple diffusion.

3. **Analyzing the Assertion**:
- Simple diffusion is a passive transport mechanism that does not require energy. It allows molecules to move freely across a membrane until equilibrium is reached.
- Since it does not involve specific transport proteins that can become saturated, it does not exhibit saturation kinetics.

4. **Analyzing the Reason**:
- The reason is correct because simple diffusion is indeed driven by the concentration gradient. The greater the difference in concentration between two areas, the faster the diffusion will occur.

5. **Conclusion**:
- Both the assertion and the reason are correct statements. However, the reason does not fully explain why simple diffusion does not follow saturation kinetics. The assertion stands independently as a valid statement.

6. **Final Answer**:
- The correct option is that both the assertion and the reason are correct, but the reason does not adequately explain the assertion.