Three cylinders of potato were carefully dried on a blotting paper and weighed. Each piece weighed 3 grams. Each one was placed in the beaker as shown below:
Answer the following questions: (a) After 48 hours, which potato cylinder would be the heaviest? (b) The movement of which substance is mainly responsible for the weight change in the potato cylinders? (c) Name and define the process which is responsible for the movement of substance mentioned in answer (b). (d) Write specific names of the processes which occur in beakers B and C [kinds of processes defined in answer (c)]. (e) Would there be any difference in the weight of the potato cylinder in beaker A after 48 hours? Give reason.

Question

Three cylinders of potato were carefully dried on a blotting paper and weighed. Each piece weighed 3 grams. Each one was placed in the beaker as shown below:

Three cylinders of potato were carefully dried on a blotting paper and weighed. Each piece weighed 3 grams. Each one was placed in the beaker. After 48 hours, which potato cylinder would be the heaviest? The movement of which substance is mainly responsible for the weight change in the potato cylinders? Name and define the process which is responsible for the movement of substance mentioned in answer. Write specific names of the processes which occur in beakers B and C. Would there be any difference in the weight of the potato cylinder in beaker A after 48 hours? Give reason. Absorption by Roots, Concise Biology Solutions ICSE Class 10.

Answer the following questions: (a) After 48 hours, which potato cylinder would be the heaviest? (b) The movement of which substance is mainly responsible for the weight change in the potato cylinders? (c) Name and define the process which is responsible for the movement of substance mentioned in answer (b). (d) Write specific names of the processes which occur in beakers B and C [kinds of processes defined in answer (c)]. (e) Would there be any difference in the weight of the potato cylinder in beaker A after 48 hours? Give reason.

KnowledgeBoat · Accepted Answer

(a) After 48 hours, Cylinder B kept in distilled water will be the heaviest as distilled water will act as a hypotonic solution for Potato Cylinder. The Potato Cylinder will absorb distilled water from the beaker through the process of endosmosis and its weight will increase.

(b) Movement of water between potato cylinders and beakers is mainly responsible for the weight change in the potato cylinders.

(c) The physical process which is responsible for the movement of substance mentioned in answer (b) is Osmosis. Osmosis is the movement of water molecules from their region of higher concentration to their region of lower concentration through a semi-permeable membrane.

(d) The process that takes place in beaker B is osmosis, which is diffusion of water across the membrane of the potato slice cells. Plasmolysis occurs in beaker C as the potato shrinks due to hypotonic solution of 20% sucrose solution.

(d) Beaker B → Endosmosis
Beaker C → Exosmosis

(e) There will be no change in the weight of the potato cylinder in beaker A because it is kept in air. As there is no movement of water between potato cylinder and beaker so no significant change in the weight of the potato cylinder is observed in beaker A.

Biology

Roots Absorption

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