9.Carry out the following osmosis experiment:
Take four peeled potato halves and scoos 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:
() 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.
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Answers
a)Water gathers in the hollowed portion of B and C due to process of Osmosis in which outside water with high concentration make a passage through a semi-permeable membrane of potato to mix with salt or sugar with low water concentration inside the potato.
ß)Potato A is necessary in this experiment because it act as a contro experiment. (iii) Water does not gather in the Hollowed portion of potato A as it was empty. Water also does not gather in the cup D because there potato used was boiled which makes it inactive as after boiling its protein structure ware damaged.
c) Water does not gather in the hollowed out portions of A and D because cup A is empty and there is no difference in concentration of water hence no osmosis will take place.
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