Per NCERT, what does it mean to say the cell membrane is SELECTIVELY PERMEABLE?
AIt allows every substance to pass freely
BIt changes its permeability randomly with no control
CIt blocks everything from passing through
DIt allows some substances to pass through while blocking others — controlling what enters and leaves the cell
Answer & Solution
Correct answer: D. It allows some substances to pass through while blocking others — controlling what enters and leaves the cell
Per NCERT §2.2.1, selectively permeable = controlled passage of specific substances. The other options describe complete blockage / free passage / random behaviour.
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