Question

Cell membranes are

• A. Impermeable
• B. Freely permeable
• C. Selectively permeable
• D. None of these

Answer 1

The correct option is C

Selectively permeable

The correct option is C.

Explanation of the correct option:

Plasma membrane:

1. Plasma membrane forms the cell boundary and maintains the individuality of the cell.
2. It separates the cell contents from the external environment.
3. Plasma membrane is called the selectively permeable membrane because it allows only selected substances to pass through it and at the same time prevents the movement of some other materials.

Explanation of the incorrect options:

Option A:

Impermeable membrane- These membranes do not allow the movement of any kind of substances across them.

Option B:

Freely permeable membrane- These membranes allow the movement of almost all types of substances and particles across them.

Final answer: Cell membranes are selectively permeable.