Give reason for potato cubes when placed in water become firm and increase in size.

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Solution

Endosmosis:
It is a type of osmosis, in which water enters the cell from the surroundings.
Endosmosis occurs if the external solution is hypotonic.
Here, endosmosis is seen as water enters the potato cubes from the surroundings.
As a result, potato cubes swell and become firm, and also their sizes get increase.
In water potato cubes become firm and increase in size— reason:
Cells of potato cubes contain more salts and sugars than their surrounding water.
For this reason, water molecules (solvent) from the surrounding, enter the potato cubes by the process called ‘endosmosis'.

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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.

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(a) If you sprinkle some common salt on grass growing on a lawn,it is killed at that spot.

(b) If you uproot a plant from the soil,its leaves soon wilt.

(d) A plant cell when kept in a hypertonic salt solution for about 30 minutes turns flaccid.

(e) Potato cubes when placed in water become firm and increase in size.

Potato cubes when placed in water become firm and increase in size. Give reason?

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.

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