Tag: diffusion and osmosis

Questions Related to diffusion and osmosis

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

biology movement in and out of the cell diffusion across cells diffusion and osmosis inter cellular movement

  1. Neutral

  2. Hypotonic

  3. Hypertonic

  4. Isotonic

Show answer
Correct Option: B
Explanation:

If a cell swells after been placed in a solution, it means water from solution has entered the cell. As water flows from a region of its own higher concentration to a region of lower concentration, we conclude that water is present in higher concentration in the solution as compared to the cell sap. Thus, the solution is hypotonic as compared to cell sap. The process in which water enters the cell is called as endosmosis.

Plant cells are plasmolysed in a solution, which is

biology movement in and out of the cell diffusion across cells diffusion and osmosis inter cellular movement

  1. Hypotonic solution

  2. Hypertonic solution

  3. Isotonic solution

  4. None of the above

Show answer
Correct Option: B
Explanation:

When plant cells are kept in a hypertonic solution (i.e., a solution more concentrated than the plant cell sap) they lose water due to the process of exosmosis. This causes plasmolysis, a process in which protoplasm leaves cell wall and lies shrunk inside the cell. When the cell is kept in hypotonic solution (i.e., a solution far less concentrated than the plant cell sap), it gains water due to the process of endosmosis. The cell now swells and is called as deplasmolyzed cell. If plant cells are kept in isotonic solution, no changes take place. Thus, the correct answer is option B.

In plasmolysed cell, the space between cell wall and protoplasm is occupied by

biology movement in and out of the cell diffusion across cells diffusion and osmosis inter cellular movement

  1. Hypotonic solution

  2. Hypertonic solution

  3. Isotonic solution

  4. None of the above

Show answer
Correct Option: B
Explanation:
Shrinkage of the protoplast of a cell from its cell occurs under the influence of a hypertonic solution called plasmolysis.
Due to plasmolysis the protoplast separates from the cell wall and assumes a spherical form.
The space between the nucleus and plasma membrane is occupied by a hypotonic solution, i.e., like the nature of cell protoplasm as compared to the external solution.
The hypertonic solution will be present in the space between the plasma membrane and the cell membrane.

Thus, the correct answer is option B.

If a cell shrinks when placed in a solution, this solution is

biology movement in and out of the cell diffusion across cells diffusion and osmosis inter cellular movement

  1. Hypotonic

  2. Hypertonic

  3. Isotonic

  4. Pure solvent

Show answer
Correct Option: B
Explanation:

Water flows along its own concentration gradient. When a cell is placed in a hypotonic medium it swells due to absorption of water by the process of endosmosis. The endosmotic gain of water makes a cell turgid. When a cell is placed in a hypertonic medium, it loses water due to the process of exosmosis. Exosmotic loss of water results in plasmolysis. Thus, the correct answer is option B.

The solution in which a cell will gain water by osmosis is termed as

biology movement in and out of the cell diffusion across cells diffusion and osmosis inter cellular movement

  1. Isotonic solution

  2. Hypertonic solution

  3. Hypotonic solution

  4. Both A and B

Show answer
Correct Option: C
Explanation:

Hypotonic solution is a solution, which contains lesser solute concentration. In such case, the water molecules move from outside to inside of the cell through cell membrane (semi-permeable membrane). This process is called as endosmosis by which cell gain water. 

A cell placed in a hypotonic solution will_____________

biology movement in and out of the cell diffusion across cells diffusion and osmosis inter cellular movement

  1. Shrink

  2. Show plasmolysis

  3. Swell 

  4. No change in shape or size

Show answer
Correct Option: C
Explanation:

Hypotonic solution is a solution, which contains lesser solute concentration. In such a case, the water molecules move from outside to the inside of the cell through the cell membrane. This process is called as endosmosis by which cell gains water and swells up.

Which of the following statement defines hypertonic solution?

biology movement in and out of the cell diffusion across cells diffusion and osmosis inter cellular movement

  1. The solution in which the concentration of solutes is more and the concentration of solvent (water) is less as compared to the cytoplasm of a specific cell.

  2. The solution in which the concentration of solutes is less and the concentration of solvent (water) is less as compared to the cytoplasm of a specific cell.

  3. The solution in which the concentration of solutes is more and the concentration of solvent (water) is more as compared to the cytoplasm of a specific cell.

  4. The solution in which the concentration of solutes is less and the concentration of solvent (water) is more as compared to the cytoplasm of a specific cell.

Show answer
Correct Option: A
Explanation:

In the hypertonic solution, the concentration of solutes is more and the concentration of solvent (water) is less as compared to the cytoplasm of a specific cell. If a cell is placed in such solution plasmolysis will occur due to the movement water from cell to the outer environment.

Which of the following statement defines hypotonic solution?

biology movement in and out of the cell diffusion across cells diffusion and osmosis inter cellular movement

  1. The solution in which the concentration of solutes is less and concentration of solvent (water) is more as compared to the specific cell.

  2. The solution in which the concentration of solutes is less and concentration of solvent (water) is less as compared to the specific cell.

  3. The solution in which the concentration of solutes is more and concentration of solvent (water) is more as compared to the specific cell.

  4. The solution in which the concentration of solutes is more and concentration of solvent (water) is less as compared to the specific cell.

Show answer
Correct Option: A
Explanation:

In the hypotonic solution, the concentration of solutes is less and concentration of solvent (water) is more as compared to the specific cell. If a cell is placed in such solution water will move towards the cell and thus, the cell swells and burst. 

Which of the following solutions has the highest concentration of the solute?

biology movement in and out of the cell diffusion across cells diffusion and osmosis inter cellular movement

  1. Hypertonic

  2. Hypotonic

  3. Isotonic

  4. None of the above

Show answer
Correct Option: A
Explanation:

Hypotonic solution is a solution, which contains lesser solute concentration. An isotonic solution is a solution, which contains the same concentration of solute as in cell. A Hypertonic solution is a solution, which contains higher solute concentration and thus causes plasmolysis when a cell is placed in such solution.

Diffusion occurs in
(a) Solids
(b) Liquids
(c) Gases

biology movement in and out of the cell diffusion across cells diffusion and osmosis inter cellular movement

  1. a,b

  2. b,c

  3. a,c

  4. All

Show answer
Correct Option: B
Explanation:

Diffusion occurs in both liquids and gases and can take place over long distances diffusion in gases are much faster than in liquids the diffusion rate of oxygen in the air is 1,00,0001,00,000 times more than diffusion rate of oxygen in the water. Diffusion may be defined as the process of movement of gases. Liquids or solutes from the region of higher concentration to the regions of lower concentration till the molecules are uniformly distributed throughout the available space. Many substances like gases. liquids or solutes can diffuse simultaneously in different directions and at different rates in the same place without interfering with each other.

So, the correct answer is B.