A cell will swell up if

Options

A. The concentration of water molecules in the cell is higher than the concentration of water molecules in surrounding medium
B. The cocentration of water molecules in surrounding medium is higher than water molecules concentration in the cell
C. The concentration of water molecules is same in the cell and in the surrounding medium
D. Concentration of water molecules does not matter

Answer

B

Explanation

Cell wall swells up because of movement of water molecules from their higher concentration in external medium towards lower concentration of water due to osmosis across the semipermeable plasma membrane.