Tonicity

Q.

What are the consequences of the following conditions?

(a) A cell containing a higher water concentration than the surrounding medium

(b) A cell having low water concentration than the surrounding medium.

(c) A cell having equal water concentration to its surrounding medium.

Q. The space between the cell wall and shrunken protoplast in a plasmolysed cell is occupied by

1. isotonic solution
2. cell sap
3. hypertonic solution
4. hypotonic solution

Q.

If the concentration of external solution is more than the cytoplasm, the solution is known as

1. Hypotonic

2. None of the above

3. Isotonic

4. Hypertonic

Q. The condition of a plasmolysed cell can be reversed by placing the cell in a

1. hypertonic solution
2. hypotonic solution
3. plasmolysing solution
4. isotonic solution

Q. A cell is placed in 0.4 M solution of common salt and no change in volume of the cell is seen. What is the concentration of the cell sap?

1. 0.4 N
2. 0.8 N
3. 0.2 N
4. 0.16 N

Q.

Explain why :

Resins swell up when kept in water.

Q. Which of the following cells has the least turgor pressure (TP) value?

1. Flaccid cell
2. Plasmolysed cell
3. Burst cell
4. Turgid cell

Q. If a cell swells after being placed in a solution, the solution is

1. isotonic
2. none of the above
3. hypertonic
4. hypotonic

Q. If a cell swells after being placed in a solution, the solution is

1. hypertonic
2. hypotonic
3. isotonic
4. none of the above

Q. Two solutions each in 100 ml having 4 g glucose and 10 g sucrose respectively. how much urea should be added to one of them in order to make them isotonic ? (A) 0.4218gram urea in glucose solution (B) 0.77 gram urea in glucose solution (C) 0.72 gram urea in sucrose solution (D) 0.421 gram urea in sucrose solution

Q. What are the exact defenations of hypotonic and hypertonic solution ?

Q. A cell placed in a hypertonic solution shows shrining of its protoplasm due to

1. plasmolysis
2. osmosis
3. imbibition
4. endosmosis

Q. The space between the plasma membrane and the cell wall of a plasmolyzed cell surrounded by a hypertonic solution is occupied by the

1. hypotonic solution
2. isotonic solution
3. water
4. hypertonic solution

Q. If cells of onion peel and RBC are separately kept in hypotonic solution, what among the following will take place?

1. A and B both are correct
2. Both the cells will swell
3. RBC will burst easily while cells of onion peel will resist the bursting to some extent
4. RBC and onion peel cells will behave similarly

Q.

Observe the relationship between the first two pairs and then fill in the suitable word:

(b) Hypotonic: Endosmosis:: Hypertonic: _____________.

Q. The space between the cell wall and shrunken protoplast in a plasmolysed cell is occupied by

1. hypertonic solution
2. hypotonic solution
3. isotonic solution
4. cell sap

Q. A plasmolysed cell can be deplasmolysed by placing it in _____________.

1. Pure water or hypotonic solution
2. Hypertonic solution
3. Isotonic solution
4. Saturated solution

Q. A leaf peeling of Tradescantia is kept in a medium having 10% NaCl. After a few minutes, if we observe the leaf peel under the microscope, we are likely to see

1. entry of water into the cell
2. the cells bursting out
3. diffusion of NaCl into the cell
4. exit of water from the cell

Q. If plasmolysis is the shrinking of plasma membrane from the cell wall, what is exocytosis?

Q. Choose the correct answers from the alternatives given.
When a cell is kept in a 0.5 M solution of sucrose, its volume does not alter. If the same cell is placed in 0.5 M solution of sodium chloride its volume

1. Increases
2. Decreases
3. Does not show any change
4. None of these

Q. Mammalian liver cells will swell, if they are kept in

1. Hypotonic solutions
2. Isotonic solution
3. Hypertonic solution
4. Isothermal solutions

Q. A cell is placed in 0.4 M solution of common salt and no change in volume of the cell is seen. What is the concentration of the cell sap?

1. 0.2 N
2. 0.4 N
3. 0.8 N
4. 0.16 N

Q. The condition of a plasmolysed cell can be reversed by placing the cell in a

1. hypertonic solution
2. plasmolysing solution
3. hypotonic solution
4. isotonic solution

Q. Assertion :Shrinkage of the protoplast of a cell occurs under the influence of hypertonic solution. Reason: Hypertonic solution causes plasmolysis.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Both Assertion and Reason are incorrect.

Q. Photolysis of water by isolated chloroplast was demonstrated by

1. Von Niel
2. Hill
3. Liebig
4. Calvin

Q. What are the consequences of the following conditions?
A cell having equal water concentration to its surrounding medium.

Q. A plasmolysed cell can be deplasmolysed by placing it in

1. saturated solution
2. pure water or hypotonic solution
3. hypertonic solution
4. isotonic solution

Q. Choose the correct answers from the alternatives given.
If a cell is undergoing deplasmolysis, the cell is

1. Showing endosmosis
2. In hypotonic solution
3. Building up turgor
4. Showing all these

Q. Match the following lists

Q. A leaf peeling of Tradescantia is kept in a medium having 10% NaCl. After a few minutes, if we observe the leaf peel under the microscope, we are likely to see

1. exit of water from the cell
2. diffusion of NaCl into the cell
3. entry of water into the cell
4. the cells bursting out