(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

Two potato cubes each 1 cm3 in size, were placed separately in two containers (A and 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 somewhat decreased in size. Use the above information to answer the questions that follow:

Account for the softness and decrease in size of the potato cubes which were placed in sugar solution.

Two potato cubes each 1 cm3 in size, were placed separately in two containers (A and 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 somewhat decreased in size. Use the above information to answer the questions that follow:

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

A leaf cell of a water plant was placed in a liquid other than pond water. After sometime, it assumed a shape as shown below:

Comment on the nature (tonicity) of the liquid surrounding the cell.

A leaf cell of a water plant was placed in a liquid other than pond water. After sometime, it assumed a shape as shown below: 

Redraw in the space provided, the diagram of the cell if it is soon placed in ordinary water for some time.

What do you mean by transpiration pull ?

Define the cohesive force.

Give at least three uses of water to green plants

What is the significance of diffusion?

What is the water potential?

Give Reasons for the following.
It is necessary to maintain a normal osmotic concentration of the blood.

Give Reasons for the following.
Salt and sugar are used in preserving food.

Give Reasons for the following.
On sprinkling common salt on grass growing in a lawn, the grass is killed.

Give Reasons for the following.
The raisins swell up in the water.

Give Reasons for the following.
We gargle with saline water in case of throat infection.

Give Reasons for the following.
Freshwater fish cannot survive in seawater.

Give Reasons for the following.
Drops of water on a leaf of plant like peepal does not enter the leaf by osmosis?

Give Reasons for the following.
 Plants growing in fertilized soil are often found to wilt if the soil is not adequately watered. Why?

Give Reasons for the following.
Plants begin to die when the excess of soluble fertilizers are added to the soil?

Differentiate between:
Osmosis and Diffusion

Differentiate between the following
Endosmosis and Exosmosis