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- 1. Multiple Choice
Which definition of diffusion is correct?
the movement of molecules from a higher to a lower concentration, against a concentration gradient
the movement of molecules from a higher to a lower concentration, down a concentration gradient
the movement of molecules from a lower to a higher concentration, against a concentration gradient
the movement of molecules from a lower to a higher concentration, down a concentration gradient
- 2. Multiple Choice
Visking tubing is a partially permeable membrane.
Some Visking tubing containing a concentrated sugar solution is weighed and placed in distilled water, as shown.
After two hours the Visking tubing is removed and re-weighed.
What happens to the mass and why?
It decreases because sugar moves out.
It decreases because water moves out.
It increases because sugar moves in.
It increases because water moves in.
- 3. Multiple Choice
Carbon dioxide moves into and out of cells by diffusion.
Which statement is correct for a plant cell that is photosynthesising in bright sunlight?
Carbon dioxide diffuses into the cell because the concentration of carbon dioxide is higher outside the cell than inside the cell.
Carbon dioxide diffuses out of the cell because the concentration of carbon dioxide is higher outside the cell than inside the cell.
Carbon dioxide diffuses into the cell because the concentration of carbon dioxide is lower outside the cell than inside the cell.
Carbon dioxide diffuses out of the cell because the concentration of carbon dioxide is lower outside the cell than inside the cell
- 4. Multiple Choice
The diagram shows four cells that contain oxygen molecules. The concentration of oxygen in each cell is different. In which direction do the oxygen molecules diffuse?
A
B
C
D
- 5. Multiple Choice
The diagram represents oxygen molecules around and inside a cell.
Which statement explains why oxygen molecules move into the cell?
The oxygen molecules move from a high to a low concentration by diffusion.
The oxygen molecules move from a high to a low concentration by osmosis.
The oxygen molecules move from a low to a high concentration by diffusion.
The oxygen molecules move from a low to a high concentration by osmosis.
- 6. Multiple Choice
One beaker contains water. Another beaker contains a concentrated salt solution. A red blood cell is placed into each beaker.
Which diagram shows the appearance of the cells after 15 minutes?
- 7. Multiple Choice
A
B
C
D
- 8. Multiple Choice
Sugar has moved into the cell.
Sugar has moved out of the cell.
Water has moved into the cell.
Water has moved out of the cell.
- 9. Multiple Choice
A
B
C
D
- 10. Multiple Choice
Which is the correct definition of osmosis?
passage of water molecules from a region of their higher concentration to a region of their lower concentration, through a permeable membrane
passage of water molecules from a region of their higher concentration to a region of their lower concentration, through a partially permeable membrane
passage of water molecules from a region of their lower concentration to a region of their higher concentration, through a permeable membrane
passage of water molecules from a region of their lower concentration to a region of their higher concentration, through a partially permeable membrane
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