biology IGCSE

1. IGCSE BIOLOGY
MOVEMENT IN & OUT OF CELLS

3. Movement In
Out of Cells
DIFFUSSION
OSMOSIS
ACTIVE
TRANSPORT
LO: To understand the processes of diffusion, osmosis and active transport

4. Diffusion is the net movement of particles from an area of high
concentration to an area of low concentration (down the concentration
gradient), as a result of their random movement

6. Factors affecting rate of diffusion

7. Osmosis is the net movement of water molecules from an area of high
water potential (low solute concentration/ dilute solution) to an area of
low water potential (high solute concentration/ concentrated
solutions) through a partially permeable membrane.

8. Osmosis Effect in Plant Cells
Water particles diffuse from dilute
solutions to concentrated
solutions. When the cell is more
concentrated than the
surrounding cells, water
molecules diffuse into the cell
via osmosis, making it turgid.
When it is less concentrated than
the surrounding cells, water
molecules will leave the cell,
making it flaccid and leading to
plasmolysis. This effect can be
investigated by placing cells in
solutions of different concentrations

10. Osmosis Effect in Plant Cells- Virtual Lab

11. ACTIVE TRANSPORT
Active transport is the movement of molecules against a concentration
gradient (from low concentrations to higher concentration) using energy
from respiration.

13. MOVEMENT IN AND OUT OF CELL

14. MOVEMENT IN AND OUT OF CELL