Question

Which of the following controls permeability?

• A. Cell membrane
• B. Cell wall
• C. Protoplasm
• D. Cytoplasm

Answer 1

Answer: (A)

Cell membrane

In plants, the cell wall is dead at maturity and, hence, is fully permeable. The cell membrane is, however, living and is biochemically semi-permeable. The cell membrane allows the solvent to pass through but only selective solutes are allowed to come in or move out. The plasma membrane is, thus, a selectively permeable or semi-permeable membrane.

Hence, the correct option is A.