Osmosis Quiz NMDCA 24-25

What is osmosis?

• The movement of water across a selectively permeable membrane

• The movement of solutes across a selectively permeable membrane

• The movement of water into a hypertonic solution

• The movement of water and solutes in the same direction

Answer explanation

Osmosis is specifically defined as the movement of water across a selectively permeable membrane, driven by concentration gradients. This distinguishes it from the movement of solutes or other processes.

What happens to a cell placed in a hypertonic solution?

• It will gain water and swell

• It will lose water and shrink

• It will neither gain nor lose water

• It will burst

Answer explanation

In a hypertonic solution, the concentration of solutes outside the cell is higher than inside. This causes water to move out of the cell, leading to cell shrinkage.

In which type of solution will a cell remain the same size?

• Hypotonic

• Isotonic

• Hypertonic

Answer explanation

A cell remains the same size in an isotonic solution because the concentration of solutes is equal inside and outside the cell, resulting in no net movement of water.

In a saltwater solution, what is the solute?

• Salt

• Water

• Cell membrane

• Air

Answer explanation

In a saltwater solution, the solute is the substance that is dissolved. Here, salt is dissolved in water, making it the solute, while water is the solvent. Therefore, the correct answer is salt.

True or False: The solvent in any biological solution is usually water.

• True

• False

Answer explanation

True. In biological solutions, water is the most common solvent due to its ability to dissolve a wide range of substances, making it essential for various biochemical processes.

Which of the following describes a solution with sugar dissolved in water?

• Water is the solute, and sugar is the solvent

• Sugar is the solute, and water is the solvent

• Both sugar and water are solutes

• Both sugar and water are solvents

Answer explanation

In a solution of sugar dissolved in water, sugar is the solute (the substance being dissolved) and water is the solvent (the substance doing the dissolving). Therefore, the correct choice is that sugar is the solute, and water is the solvent.

In a sugar solution, which component determines the tonicity when comparing it to another solution?

• The amount of sugar

• The amount of water

• The type of container

• The temperature of the solution

Answer explanation

The tonicity of a sugar solution is determined by the amount of sugar present. It affects the osmotic pressure and how the solution compares to another, making 'the amount of sugar' the correct choice.

A cell is placed in a solution with a lower concentration of solute than inside the cell. In which direction will water flow?

• Into the cell

• Out of the cell

• Water will not move

• Both directions equally

Answer explanation

Water will flow into the cell because the solution outside has a lower concentration of solute, creating a concentration gradient. This causes water to move into the cell to balance the solute concentrations.

Tags

NGSS.MS-LS1-2

If a plant cell is placed in a hypertonic solution, what will happen?

• Water will move into the cell, causing it to swell

• Water will move out of the cell, causing it to shrink

• The cell will remain the same size

• The cell will burst

Answer explanation

In a hypertonic solution, the concentration of solutes outside the plant cell is higher than inside. This causes water to move out of the cell, leading to shrinkage, as the cell loses water to balance the solute concentrations.

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-5

In a ______ solution, water moves into the cell, causing it to swell or burst.

• hypotonic

• hypertonic

• isotonic

• neutral

Answer explanation

In a hypotonic solution, the concentration of solutes outside the cell is lower than inside, causing water to move into the cell. This influx of water leads to swelling or potentially bursting of the cell.