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# Carry out the following osmosis experiment: Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water. Now,(a) Keep cup A empty(b) Put one teaspoon sugar in cup B(c) Put one teaspoon salt in cup C(d) Put one teaspoon sugar in the boiled potato cup D.Keep these for two hours. Then observe the four potato cups and answer the following:(i) Explain why water gathers in the hollowed portion of B and C.(ii) Why is potato A necessary for this experiment?(iii) Explain why water does not gather in the hollowed out portions of A and D.

(i) Water will accumulate in the hollowed portions of B and C as a result of difference in the water concentration, due to which a concentration gradient forms and thus water from higher concentration (from the trough containing water) flows to a region of lower water concentration (hollowed portion of potato cups). This is a result of osmosis of water in a hypotonic solution.

(ii) Potato cup A is essential in this experiment as it is a significant reference to compare different scenarios seen in potato cups B, C and D.

(iii) Potato cup A didn't show any change in the concentration because it is an example of isotonic solution. Potato cup D is a boiled potato which tells us that this potato has same or more water concentration than the trough containing water in which potato cup D is placed. So there is no flow of water from the trough into the hollow portion of potato cup D.