Investigating Diffusion
By G Davidson
1. Diffusion does not include a selectively permeable membrane.
True
False
2. Osmosis does not involve a selectively permeable membrane.
3. If plant cells are placed in pure water they will become .
4. Plant cell walls are
impermeable
selectively permeable
freely permeable
5. Unicellular animals have vacuoles to stop the from bursting.
6. Molecules will ALWAYS diffuse down a concentration gradient.
7. If potato cells are added to a solution of low water concentration they will
gain weight
lose weight
stay the same weight
8. Unicellular animals rely on diffusion for the supply of which gas?
9. What word is used to describe a plant cell whose vacuole has shrunk and the cell membrane has been pulled away from the cell wall?
10. In the air sacs of our lungs, which gas(es) diffuse between the lungs and the blood?
oxygen
carbon dioxide
oxygen and carbon dioxide
none of the above