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Transport of Water

A candidate i...

Question

A candidate in order to study the process of osmosis has taken 3 potato cubes and put them in 3 different beakers containing 3 different solutions. After 24 hours, in the first beaker the potato cube increased in size, in the second beaker the potato cube decreased in size and in the third beaker there was no change in the size of the potato cube. The following diagram shows the result of the same experiment:
In beaker 3 the size of the potato cube remains the same. Explain the reason in brief.

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Solution

The size of the potato remains the same as the concentration of the solution outside and inside the cells of the potato cube is the same and hence there is no movement of water molecules into or out of the cells.

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Similar questions

Two potato cubes each 1 $c m^{3}$ in size, were placed separately in two containers (A & B), the container (A) having water and the other (B) containing concentrated sugar solution. After 24 hours when the cubes were examined, those placed in water were found to be firm and had increased slightly in size and those placed in concentrated sugar solution were found to be soft and had somewhat decreased in size. Use the above information to answer the questions that follow:

(a) Account for the firmness and increase in the size of the potato cubes placed in water.

(b) Accounts for the softness and decrease in the size of the potato cubes which were placed in sugar solution.

(c) Name and define the physical process being investigated in this experiment.

Q. Two potato cubes each

1 c m^{3}

in size, were placed separately in two containers (A & B), the container (A) having water and the other (B) containing concentrated sugar solution. After

24

hours when the cubes were examined, those placed in water were found to be firm and had increased slightly in size and those placed in concentrated sugar solution were found to be soft and had some what decreased in size.
Account for the firmness and increase in the size of the potato cubes placed in water.

Q. Two potato cubes each

1 c m^{3}

in size, were placed separately in two containers (A & B), the container (A) having water and the other (B) containing concentrated sugar solution. After

24

hours when the cubes were examined, those placed in water were found to be firm and had increased slightly in size and those placed in concentrated sugar solution were found to be soft and had some what decreased in size.
Account for the softness and decrease in the size of the potato cubes which were placed in sugar solution.

Q. Peeled potatoes were cut into two sizes of cubes

- 1 {cm}^{3} (1 cm \times 1 cm \times 1 cm)

27 {cm}^{3} (3 cm \times 3 cm \times 3 cm)

and weighed. Then, 27 of the

1 {cm}^{3}

cubes were placed in one beaker of distilled water, and one

27 {cm}^{3}

cube was placed in another beaker. One hour later the cubes were removed and their surfaces carefully dried. They were then reweighed. The conclusions drawn from the experiment are as follows:
(i) The 27 small cubes were used as they have the same total volume and surface area as the large cube.
(ii) The lower water potential of the potato compared to the surrounding solution results in the mass increase of the potato.
(iii) The difference in percentage increase in mass of the large and small cubes is due to the larger volume of the large cube as compared with one of the individual small cubes.
(iv) If the potatoes were left in the water long enough for the system to reach equilibrium the large cube would display percentage increase in mass equal to that of the small cubes.
Which of the following statement (s) is (are) correct?

Q. Two potato cubes each

1 c m^{3}

in size, were placed separately in two containers (A & B), the container (A) having water and the other (B) containing concentrated sugar solution. After

24

hours when the cubes were examined, those placed in water were found to be firm and had increased slightly in size and those placed in concentrated sugar solution were found to be soft and had some what decreased in size.
Name and define the physical process being investigated in this experiment.

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