(As presented in the student homework task sheet)
- Define diffusion.
- Explain what is meant by the phrase “steep concentration gradient”.
- Look at the statements below. For each one draw a tick or a cross to indicate whether the statement is true or false.
Statement ✓or ✗ Particles remain still unless there is a concentration gradient present. Particles move at random. Increasing the temperature increases the speed of particle movement and therefore the rate of diffusion. A steeper concentration gradient results in a slower rate of diffusion. A shorter diffusion pathway results in a faster rate of diffusion.
- Define Osmosis.
- a) State what happens to an animal cell when placed in pure water. b) Explain why the same thing will not happen in a plant cell.
- When placed in a hypertonic solution, the cell membrane of a plant cell may pull away from the cell wall. What name is given to this process?