Tag: biology

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

A cell will swell up if________________

  1. The concentration of water molecules in the cell is higher than the concentration of water molecules in surrounding medium.

  2. The concentration of water molecules in surrounding medium is higher than water molecules concentration in the cell.

  3. The concentration of water molecules is same in the cell and in the surrounding medium.

  4. Concentration of water molecules does not matter.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The cell swells up when endosmosis occurs. Endosmosis is a process in which the water molecules move from outside to the inside of the cell through the cell membrane. This occurs when the solution is hypotonic, i.e., the cell has a lower solute concentration than the surrounding medium.

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

A cell increases in volume if the external medium is 

  1. Hypotonic

  2. Slightly hypertonic

  3. Isotonic

  4. Much more concentrated than the protoplasm of the cell
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Osmosis is defined as the movement of solvent molecules from a region of their higher concentration (more dilute solution) to a region of their lower concentration (more concentrated solution), through a semipermeable membrane. Hence, the water molecules move into a cell when a cell is placed in a hypotonic medium (resulting in an increase in cell volume) and water moves out of the cell when a cell is placed in a hypertonic medium (resulting in a decrease in cell volume). Thus, the correct answer is option A.

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

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

  1. Neutral

  2. Hypotonic

  3. Hypertonic

  4. Isotonic
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Plant cells are plasmolysed in a solution, which is

  1. Hypotonic solution

  2. Hypertonic solution

  3. Isotonic solution

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Hypotonic solution

  2. Hypertonic solution

  3. Isotonic solution

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.
Multiple choice biology movement in and out of the cell diffusion across cells diffusion and osmosis inter cellular movement

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

  1. Hypotonic

  2. Hypertonic

  3. Isotonic

  4. Pure solvent
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Isotonic solution

  2. Hypertonic solution

  3. Hypotonic solution

  4. Both A and B
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 

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

A cell placed in a hypotonic solution will_____________

  1. Shrink

  2. Show plasmolysis

  3. Swell

  4. No change in shape or size
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Which of the following statement defines hypertonic solution?

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Which of the following statement defines hypotonic solution?

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.