Chapter 2 / 7 short lessons
Movement of substances
Explain how substances enter and leave cells, and predict what happens when their surroundings change.
G3 Pure Biology / K325 / 2027 syllabus
What do you think?
A potato strip loses mass in sugar solution. What most likely moved?
Lessons
0 of 7 marked as readDiffusion
Predict the net movement of particles from their concentration gradient.
About 4 minOsmosis
Predict the net movement of water using water potential and membrane permeability.
About 4 minOsmosis in plant and animal cells
Link water movement to changes in plant and animal cells.
About 5 minActive transport
Explain movement against a concentration gradient using energy from respiration.
About 4 minDiffusion, osmosis or active transport?
Choose the process using the substance, membrane and direction of movement.
About 3 minInvestigating osmosis
Calculate percentage mass change, interpret the evidence and plan a fair comparison.
About 6 minDescribe a trend and calculate a percentage change
Describe a trend with quoted figures and units, calculate percentage change to 3 significant figures with its sign, and deal with an anomalous result.
About 7 minWhat you will be able to do
- Use concentration and water potential to predict net movement.
- Explain the effects of osmosis on plant and animal cells.
- Distinguish diffusion, osmosis and active transport.
- Use experimental evidence to explain a change in mass.
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