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NCERT Exemplar Solutions Class 9 Science Solutions for The Fundamental Unit of Life - Exercise in Chapter 5 - The Fundamental Unit of Life

Question 31 The Fundamental Unit of Life - Exercise

A cell will swell up if

(a) The concentration of water molecules in the cell is higher than the concentration of water molecules in the surrounding medium

(b) The concentration of water molecules in the surrounding medium is higher than water molecules concentration in the cell

(c) The concentration of water molecules is the same in the cell and in the surrounding medium

(d) The concentration of water molecules does not matter

Answer:

The answer is (b) The concentration of water molecules in the surrounding medium is higher than water molecules concentration in the cell.

Explanation:

When the concentration of water molecules in the surrounding medium is higher than water molecules concentration in the cell water from the surrounding enter the cell through osmosis and the cell swells up.

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