Why is the plasma membrane described as selectively permeable?

Type: MCQ • Marks: 1

A. It is completely impermeable to everything

B. It allows only water to pass

C. It allows all molecules to pass freely

D. It permits only certain specific molecules and ions to cross while blocking others

Explanation

Selective permeability ensures internal homeostasis by controlling substance entry and exit.

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Class 9th Science (MCQ)

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