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GCSE/IGCSE Biology

Biology Required Practicals

GCSE/IGCSE Physics

GCSE/IGCSE Chemistry

GCSE/IGCSE Maths

Investigate the effect of a range of concentrations of salt or sugar solutions on the mass of plant tissue.

Investigate osmosis in potatoes.

- A known mass of potato must be added to sucrose solution, left for some time, and the final mass recorded to obtain the percentage change in mass.
- This investigation looks at the exchange of water between the potato and solution and allows the concentration of sucrose in the potato to be determined.
- The practical provides an opportunity for the appreciation of the need to control variables.

**Osmosis**

00:00 Preparing potato cylinders

03:17 Adding sucrose solutions

05:15 Obtaining results

09:55 Analysing data

**Required Practical: Effects of Osmosis on Plant Tissue**

- Investigate the effects of osmosis on plant tissue.
- How to calculate percentage change?
- Discuss what are the expected results and what they mean.

Check out the sample question and solution on Sample Assessment Material (page 23), paper 1BI0/1BH and 1BIO/1BF.

Diffusion, active transport and osmosis can be used to move substances into and out of cells. A student was investigating osmosis in potato cubes.

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