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

(a) Mention whether the following statement is true (True) or false (False) 

(b) Correct the false statement by altering the last word only.

A plant cell placed in hypotonic solution gets Plasmolysed. 

Mention whether the following statement is true or false. Correct the false statement by altering the last word only.  

Addition of salt to pickles prevents growth of bacteria because they turn turgid. 

Mention whether the following statement is true or false. Correct the false statement by altering the last word only. 

The shrinkage of protoplasm, when a cell is kept in hypotonic solution.

Give reason for the following:

Potato cubes, when placed in water, become firm and increase in size.

Give two examples of turgor movements in plants. 

Explain how soaked seeds swell up and burst their seed coats. 

Leaves of the sensitive plant wilt and droop down on a slight touch. What mechanism brings about this change?

The following diagram represents a plant cell after being placed in a strong sugar solution. 

Guidelines 1 to 5 indicate the following

(1)Cell wall, (2) Strong sugar solution, (3) Protoplasm  (4) Large vacuole,   (5) Nucleus

(1)What is the state of the cell shown in the cell shown in the diagram?

(2)Name the structure which acts as a selectively permeable membrane.

(3)If the cell had been placed in distilled water instead of strong sugar solution, which feature would not have been seen?

 (4)Name any one feature of this plant cell which is not present in an animal cell. 

The diagram given below represents an experimental set-up to demonstrate a certain process. Study the same and answer the questions that follow:

1. Name the process.
2. Define the above-named process.
3. What would you observe in the experimental set-up after an hour or so?
4. What control experiment can be set up for comparison?
5. Keeping in mind the root hair, cell and its surroundings, name the parts that correspond to
   1. concentrated sugar solution
   2. parchment paper
   3. water in the beaker
6. Name any other material that can be used instead of parchment paper in the above experiment.
7. Mention two advantages of the process for the plants.

Two potato cubes each 1 cm3 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:

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

Show by a series of diagrams, the change which a plant cell will undergo when placed in
Hypertonic salt solution

Show by a series of diagrams, the change which a plant cell will undergo when placed in 

Hypotonic salt solution 

With decrease in atmospheric pressure, the rate of transpiration will

The rate of transpiration is more when

One of the internal factors which affect the rate of transpiration is

The loss of water as water vapour from the acrial parts of a plant is known as

Transpiration will be fastest when the day is

Most of the transpiration in tall trees occurs through

Transpiration is best defined as

(a) State whether the following statement are True (T) or False (F)

(b) Rewrite the false statement in (a) above in the correct form by changing either the first or the last word only.

Wind velocity has an effect on transpiration.