Assertion : If red blood cells were removed from the body and placed in pure water, pressure inside the cells increases.
Reason : The concentration of salt content in the cells increases.

Options

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

Explanation

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

### Step 1: Understand the Assertion
The assertion states that if red blood cells are removed from the body and placed in pure water, the pressure inside the cells increases. This is due to the process of osmosis.

**Hint:** Recall that osmosis is the movement of water across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

### Step 2: Analyze the Situation
When red blood cells are placed in pure water, the concentration of solutes (like salts) inside the cells is higher than that in the surrounding pure water. As a result, water will move into the cells to equalize the concentration of solutes on both sides of the cell membrane.

**Hint:** Think about how water moves in relation to solute concentration.

### Step 3: Pressure Inside the Cells
As water enters the red blood cells, the volume of the cells increases, leading to an increase in pressure inside the cells. If too much water enters, it can cause the cells to swell and potentially burst (lyse).

**Hint:** Consider what happens to a balloon when you fill it with more air.

### Step 4: Understand the Reason
The reason states that the concentration of salt content in the cells increases. However, this is not accurate in the context of the assertion. The concentration of salt in the cells does not increase; instead, the water entering the cells dilutes the salt concentration inside the cells.

**Hint:** Reflect on what happens to concentration when more solvent (water) is added to a solution.

### Conclusion
The assertion is true: the pressure inside the cells increases when they are placed in pure water. However, the reason is false: the concentration of salt content in the cells does not increase; it actually decreases due to dilution.

### Final Answer
- Assertion: True
- Reason: False