Osmosis Multiple Choice Questions

What is the definition of osmosis?

• The movement of solute molecules from a high to a low concentration.

• The diffusion of water through a partially permeable membrane.

• The use of energy to move water against a concentration gradient.

• The movement of any liquid through a cell wall.

In the context of osmosis, what does a 'partially permeable membrane' do?

• It allows all molecules to pass through freely.

• It stops all molecules from passing through.

• It allows small water molecules to pass through but not larger solute molecules.

• It only allows large solute molecules to pass through.

(Supplement) Which of the following has the highest water potential?

• Concentrated sugar solution.

• Dilute sugar solution.

• Pure water.

• Cytoplasm inside a plant cell.

(Supplement) Water always moves by osmosis from a region of...

• lower water potential to higher water potential.

• higher water potential to lower water potential.

• low solute concentration to high solute concentration.

• a dilute solution to a more dilute solution.

What was the purpose of the Visking tubing demonstration at the start of the lesson?

• To show the effects of temperature on diffusion.

• To model how water moves by osmosis into a 'cell'.

• To demonstrate how to use a cork borer safely.

• To measure the concentration of a sugar solution.

In the potato osmosis practical, why is it important to cut the potato cylinders to the same length and diameter?

• To make them fit into the test tubes easily.

• To ensure they all have the same initial mass.

• To control the surface area, making it a fair test.

• To make them easier to blot dry.

Why are the potato cylinders blotted dry before their mass is measured?

• To remove any excess water on the surface that would affect the mass reading.

• To make the potato cylinders easier to handle.

• To activate the enzymes inside the potato cells.

• To clean the potato cylinders of any dirt.

A student places a potato cylinder in a test tube of pure water. What do you predict will happen to the mass of the potato cylinder overnight?

• It will decrease.

• It will stay the same.

• It will increase.

• It will dissolve.

A potato cylinder placed in a very concentrated sucrose solution will lose mass. This is because...

• The potato has a higher water potential than the solution.

• The solution has a higher water potential than the potato.

• Sugar molecules diffuse out of the potato.

• The potato cells use energy to pump water out.

Which of these is NOT a key vocabulary word for this lesson?

• Osmosis

• Water Potential

• Solute

• Active Transport