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

Name the following.

The instrument used for measuring the rate of transpiration.

Mark the most appropriate answer in the following:

If the rate of transpiration becomes more than the rate of photosynthesis, plant will ______

Choose the correct answer:

Rate of transpiration is more, when __________

The rate of transpiration is determined with a/an ______.

Choose the correct answer:

Transpiration rate is high, when ___________

Transpiration rate is reduced ______.

Mention whether the following statement is true (T) or false (F) and give explanation in support of your answer.

Plasmolysis is reverse of deplasmolysis.

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.