Tag: diffusion across cells

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Questions Related to diffusion across cells

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

Match column I with column II and select the correct option from the codes given.


Column I Column II
A. Hypotonic (i) No net flow of water
B. Hypertonic (ii) Water moves into the cell
C. Isotonic (iii) Water moves out of the cell

  1. A-(ii), B-(iii), C-(i)

  2. A-(iii), B-(ii), C-(i)

  3. A-(i), B-(ii), C-(iii)

  4. A-(ii), B-(i), C-(iii)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hypotonic solutions have lower solute concentration, causing water to move into the cell (osmosis). Hypertonic solutions have higher solute concentration, causing water to move out of the cell. Isotonic solutions have equal solute concentration, resulting in no net water movement. Option A correctly matches these definitions.

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

Many freshwater organisms cannot live for long in seawater because the surrounding water will be ______ to body cells and ______ may occur.

  1. Hyper tonic, Exosmosis

  2. Hyper tonic, Endosmosis

  3. Hypo tonic, Exosmosis

  4. Hypo tonic, Endosmosis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the sea water , the surrounding water is salty and hence hypertonic to the body cells, Thus, water will move from its higher concentration to ts lower concentration leading to exosmosis. Therefore, many fresh-water animals cannot live for long in sea water and vice versa. 

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

Which of the following occupies the space between the cell wall and the shrunken protoplast in a plasmolysed cell?

  1. Isotonic solution

  2. Hypotonic solution

  3. Hypertonic solution

  4. Water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

If a plant cell is kept in hypertonic solution, water comes out from the cell sap due to exosmosis. Water loss from the cell sap results in contraction of protoplast, which is referred to as plasmolysis. The cell is surrounded by the hypertonic solution, and the cell wall allows entry of most of the solutions. The hypertonic solution enters the cell wall freely but is not allowed to cross the cell membrane. 

Thus, the space between the cell wall and condensed protoplast is filled with hypertonic solution in a plasmolyzed cell.

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

A cell shrinks on being kept in a solution. The solution is 

  1. Isotonic

  2. Hypotonic

  3. Hypertonic

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
If a cell gets reduced in size or shrinks when placed in solution, the solution is hypertonic because a hypertonic solution has lesser concentration of solvent molecules than the fluid inside the cell so the solvent molecules are forced outside the cell from the region of higher concentration to the lower concentration by the process of exosmosis. The cell turns flaccid.
So, the correct answer is option C.
Multiple choice biology movement in and out of the cell diffusion across cells diffusion and osmosis inter cellular movement

If the external solution balances the osmotic pressure of cytoplasm, it is said to be isotonic.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If the osmotic pressure outside the cytoplasm is the same as inside then it is known as an isotonic solution.

In an isotonic condition, amount of water entering the cell is the same as the amount of water going out of the cell. Hence no swelling or shrinking occurs.
So the correct answer is 'True'.

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

If alcohol treated cell is kept in hypertonic solution it___________.

  1. Burst

  2. Remains same

  3. Plasmolysis

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
If alcohol-treated cell is kept in hypertonic solution, alcohol never enters into the cell, and the cell remains the same as alcohol prevents water loss from the cells.
So, the correct  option is 'remains same'.

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

The space between plasma membrane & cell wall of plasmolysed cell is occupied by?

  1. Isotonic solution

  2. Hypertonic solution

  3. Hypotonic solution

  4. Water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a plant cell is placed in a hypertonic solution it will lose water by exosmosis. This process is called plasmolysis. The protoplasm will shrink and will move inwards and away from the cell wall. As a result, the hypertonic solution will occupy the space between the plasma membrane and the cell wall.

So, The correct answer is (B).

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

What will happen if we put a plant and animal cell in the isotonic solution?

  1. No change

  2. Cell swells

  3. Cell shrinks

  4. Cell bursts
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An isotonic solution is a solution, which contains the same concentration of solute as in a cell. If animal and plant cells are kept in isotonic solution then cells will not swell or shrink. Hence, there will not be any change in cells. 

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.