Question

what makes resing to swell when placed in water?

Answer 1

It is because the water concentration is less than the resin(grape).So osmosis process takes place in which lower concentration to higher concentration.So the wAter having less concentration and it goes into the membrane of grape in which it has higher concentration.This is why the resing swell when placed in water.
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Answer 2

Dried raisins when kept in pure water swells up after sometime due to endosmosis the concentration of solutes in raising is more than the outside so water move inside the raisin resulting in this swelling raisins shrinks in concentrated saline water due to exosmosis. As the concentration of solutes is more outside I. e. in saline water as compared to raisin, so it looses water and shrinks to attain equilibrium.