Tonicity

Q.

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

(a) Give the term fro the state of the cell it has acquired.

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

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

Q.

What is the difference between 'flaccid' and 'turgid"? Give one example of the flaccid condition in plants.

Q.

Cell shape and size remain the same when the solution outside is

1. Hypotonic

2. Hypertonic

3. None of these

4. Isotonic

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.

The state of a cell in which the cell wall is rigid and stretched by the increase in volume due to the absorption of water is called

(a) Flaccidity (b) Turgidity

(c) Capillarity (d) Tonicity

Q. What happens when a cell placed in hypertonic solution?

1. Endosmosis
2. Deplasmolysis
3. Exosmosis
4. Imbibition

Q.

if cell onion peel and RBC are separetely kept in hypotonic solution what among the following will take place? Explain the reason for your answer

Q. Explain why:
(i) Raisins swell up in water.
(ii) We gargle with saline solution in case of throat infection.
(iii) Bacteria and fungi do not grow in pickles, jams, jellies, and squashes.
(iv) The leaves of wilted lettuce, if kept in cold water, become crisp.

Q. Which cellular structure provides resistance to microbes to withstand hypotonic external media without bursting?

1. Cell membrane
2. Cell wall
3. Mitochondria
4. Ribosome

Q.

Cell shape and size remain the same when the solution outside is

1. Hypotonic

2. Hypertonic

3. Isotonic

4. None of these