Q. Consider the following statements regarding the cell wall:
1.It is a rigid, non-living structure located outside the plasma membrane in plant cells and fungi.
2.It provides mechanical strength and structural support to the cell, protecting it against osmotic pressure.
3.It serves as the primary metabolic gatekeeper, controlling the selective permeability of all ions and organic molecules into the cytoplasm.
How many of the statements given above are correct?
Answer: B
Notes:
Explanation:
- Statements 1 and 2 are correct: The cell wall is a structural layer that provides protection and rigidity.
- Statement 3 is incorrect: The cell wall is generally permeable to most small molecules. It is the Plasma Membrane (cell membrane) that is selectively permeable and controls the entry and exit of specific substances.
