Sarthaks Test
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A cell will swell up if: 

A. The concentration of water molecules in the cell is higher than the concentration of water molecules in surrounding medium 

B. The concentration 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

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If the water concentration inside the cell is higher, it means that the concentration of solutes will be lesser inside the cell as compared to the outside where the water concentration is lower. Due to osmosis, the water will move inside the cell and hence the cell will swell.

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