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During the course of an experiment, to determine the percentage of water absorbed by raisins, the raisins are weighed(a) Every half an hour. (b) Every hour.(c) Once- only after completing the experiment. (d) Two times- Before soaking and after soaking for three hours.
Correct Answer: (d) Two times- Before soaking and after soaking for three hours
Explanation:
During an experiment to determine the percentage of water absorbed by raisins, a definite amount of raisins are taken and their dry weight is measured.
These raisins are placed in a definite measured volume of water (hypotonic solution).
Raisins absorb water under the osmotic process and swell up.
Osmosis is the movement of solvent or water molecules from a higher concentration area to a lower concentration area through a semipermeable membrane to attain equilibrium.
Water movement into the cells of raisins through their cell membrane continues till cells become turgid in nature.
Soaked raisins are wipe out and weigh the soaked raisins.
The difference in the weight of the raisins before soaking and after soaking determines the amount of water absorbed by them.
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