Assertion : Shrinkage of the protoplast of a cell occurs under the influence of hypertonic solution.
Reason : Hypertonic solution causes plasmolysis.

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.

Explanation

To solve the question, we need to analyze both the assertion and the reason given.

### Step 1: Understand the Assertion
The assertion states that "shrinkage of the protoplast of a cell occurs under the influence of a hypertonic solution."

- A hypertonic solution has a higher concentration of solutes compared to the inside of the cell.
- When a cell is placed in a hypertonic solution, water moves out of the cell to balance the solute concentrations.
- This movement of water leads to the shrinkage of the protoplast, which is the living part of the cell that includes the cytoplasm and the plasma membrane.

**Hint:** A hypertonic solution causes water to leave the cell, leading to shrinkage.

### Step 2: Understand the Reason
The reason states that "hypertonic solution causes plasmolysis."

- Plasmolysis is the process where the protoplast of a plant cell shrinks away from the cell wall due to the loss of water when the cell is placed in a hypertonic solution.
- This is a direct consequence of the water moving out of the cell, confirming that the assertion is indeed correct.

**Hint:** Plasmolysis is the term used to describe the shrinkage of the protoplast due to water loss.

### Step 3: Evaluate the Relationship
Now we need to determine if the reason correctly explains the assertion.

- Since the assertion is that shrinkage occurs due to hypertonic solutions, and the reason explains that this shrinkage is called plasmolysis, the reason supports the assertion.
- Therefore, both the assertion and the reason are true, and the reason is the correct explanation of the assertion.

**Hint:** Check if the reason clarifies or supports the assertion; in this case, it does.

### Conclusion
Both the assertion and the reason are true, and the reason is the correct explanation of the assertion.

**Final Answer:** Both assertion and reason are true, and reason is the correct explanation of the assertion.