Osmosis and Diffusion

This is a flipped learning lesson.

Students - watch the video and answer the questions on the student homework task sheet before your next lesson.

(Teachers - scroll down to view the full lesson plan for this topic.)

Student questions:

(As presented in the student homework task sheet)

    1. Define diffusion.
    2. Explain what is meant by the phrase “steep concentration gradient”.
    3. 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.
    4. Define Osmosis.
    5. 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.
    6. 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?

Need more practice?

A revision notes and practice questions pack on Osmosis, Diffusion and Active Transport is available from the Science Sauce store (£3/$4).

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