Read the given statements and select the correct ones.
`A` membrane which permits the passage of pure solvent molecules to pass through it and not the solute particles is called semi-permeable.
A membrane which allows some substances to pass through it more readily than other is known as selectively`//`differentially permeable.
All living biological membranes are perfectly semi-permeable.

Options

A. `(a)` and `(ii)`
B. `(ii)` and `(iii)`
C. `(i)` and `(iii)`
D. `(i),(ii)` and `(iii)`

Explanation

To solve the question, we need to analyze each of the given statements about membranes and determine their correctness.

### Step-by-Step Solution:

1. **Evaluate the First Statement:**
- The first statement claims that "a membrane which permits the passage of pure solvent molecules to pass through it and not the solute particles is called semi-permeable."
- This statement is **true**. A semi-permeable membrane allows only certain molecules (like solvent molecules) to pass through while blocking others (like solute particles).

2. **Evaluate the Second Statement:**
- The second statement states that "a membrane which allows some substances to pass through it more readily than others is known as selectively or differentially permeable."
- This statement is also **true**. Selectively permeable membranes allow certain substances to pass more easily than others, which is a characteristic of biological membranes.

3. **Evaluate the Third Statement:**
- The third statement asserts that "all living biological membranes are perfectly semi-permeable."
- This statement is **false**. Biological membranes are not perfectly semi-permeable; they are selectively permeable, meaning they allow some solutes to pass through while restricting others.

4. **Conclusion:**
- The correct statements are the first and the second ones. Therefore, the answer to the question is that the correct options are the first and second statements.

### Final Answer:
The correct statements are:
- First Statement: True
- Second Statement: True
- Third Statement: False

Thus, the correct option is **first and second**.

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