Q. A few resins were put in a container with some water and left for 3 to 4
hours. Answer the following questions accordingly.
a. Write the changes observed in the resins after 3 to 4 hours.
b. If these same raisins are now left in sunlight for 4 hours, what would
be the change observed?
c. Give reason for change observed in a. and b. above.
d. Identify the process in a. above.
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Answer:
Answer below
Explanation:
a. The raisins swell up.
b. The raisins shrink again.
c. a.-- The water molecules go inside the raisins through its semi-permeable membrane.
b.-- The water molecules evaporate from the raisins.
d. The process is Osmosis.
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a. The changes that were observed in the region after 3to 4 hour was the swelling of the reason.
b. If these raisin a left in sunlight for 4 hours there will be decrease in the size of the raisin because of the process of plasmolysis
Explanation:
c. the reason for this change is that when it is placed in sunlight there is loss of water by the process of evaporation. On the other hand when it was placed in clean water by the process of osmosis there was entry of water inside the raisin. d. The phenomena which is seen in the above case is known as endosmosis and exosmosis
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