Question

Which of the following is not an important determinant of the movement of molecules in or out of the cell?

(a) Cell membrane

(b) Thickness of membrane

(c) Tonoplast

(d) Membrane of vacuole

The question was asked in final exam.

Query is from Plant-Water Relations-2 in portion Transport in Plants of Biology – Class 11

Answer 1

Correct answer is (b) Thickness of membrane

Easy explanation: Thickness of membrane has no role to play in the movement of molecules from one region to another. The cell membrane, tonoplast and membrane of the vacuole must be permeable to the substances, hence, are important determinants of the transportation of molecules.