Topic 3: Movement in and out of cells

Why does the water in the beaker turn red after one hour?

• Molecules of red ink move through the membrane by diffusion.

• Molecules of red ink move through the membrane by osmosis.

• Molecules of water move through the membrane by diffusion.

• Molecules of water move through the membrane by osmosis.

Why does oxygen diffuse from the air into the water before reaching the fish?

• Oxygen is more concentrated in the water than in the air.

• Oxygen is needed by the fish for aerobic respiration.

• Oxygen is needed by the fish for anaerobic respiration.

• Oxygen is more concentrated in the air than in the water.

Which structure provides the best surface for diffusion?

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What will happen to the plant cell several minutes after it has been placed in a concentrated solution of sugar?

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A red blood cell is placed in a concentrated sugar solution. What happens, and why?

• The cell bursts as sugar molecules diffuse into it

• The cell shrinks because sugar molecules leave it

• The cell shrinks because water leaves it

• The cell bursts because the concentrated sugar solution enters it

On a dry, sunny day, how does water vapour move through the stomata of a leaf?

• out of the leaf by osmosis

• into the leaf by diffusion

• into the leaf by osmosis

• out of the leaf by diffusion

The scent of a bunch of flowers spreads throughout a room. How does the scent spread?

• by transpiration

• by diffusion

• by conduction

• by osmosis

Which type of cell does the diagram show?

• a plant cell in a concentrated solution of salts

• an animal cell in pure water

• an animal cell in a concentrated solution of salts

• a plant cell in pure water

Which process occurs by osmosis?

• the small intestine absorbing fatty acids into the blood

• plant roots absorbing water from the soil

• plant roots absorbing mineral ions from the soil

• the small intestine absorbing glucose into the blood

Which statement describes how young plants are supported?

• the pressure of water passing from the roots through the xylem

• the water pressure inside the cells pressing outwards on the cell membranes

• the water pressure inside the cells pressing outwards on the cell membranes

• the pressure of water inside the cells pressing outwards on the cell walls