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

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Solution

Potato cubes when placed in water become firm and increase in size as endosmosis takes place when they are placed in a hypotonic solution (pure water).
Inside the potato cell, there is a higher concentration of cell sap than in the surrounding water. As a result, endosmosis occurs, resulting in the transfer of water molecules (solvent) from a lower concentration to a greater concentration, causing the cell to firm up.

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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.

Give reasons for the following:

(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.

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

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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