Edexcel IGCSE Biology 2.17 Diffusion and Osmosis Practical Questions

Practise planning diffusion and osmosis investigations, controlling variables, plotting result graphs and calculating rates from data.

Exam points

Identify independent, dependent and control variables in diffusion and osmosis investigations.
Plot and interpret practical results on line graphs with suitable axes, units, scales and plotted points.
Calculate diffusion rates and interpret osmosis results, including changes in mass and percentage change.
Describe practical methods for testing osmosis or diffusion, including temperature changes, safe apparatus use and repeats.

[Maximum number: 2]

The image shows some cells from onion epidermis.

Figure for Question Edexcel IGCSE Biology 2.17 Diffusion and Osmosis Practical Questions question 1 — Edexcel IGCSE Biology

The images show samples of red onion epidermis cells before and after being placed into a 5\% sucrose solution for one hour.

Before

After

Describe how to make $10 \mathrm{~cm}^{3}$ of a 5% sucrose solution from a 10% sucrose solution and pure water.

A description that makes reference to the following:

- use a syringe / pipette / beaker / (measuring) cylinder / eq

- mix $5\left(\mathrm{~cm}^{3}\right)$ of ( $\left.10 \%\right)$ sucrose solution with $5\left(\mathrm{~cm}^{3}\right)$ water / eq

Accept other correct measuring apparatus

Accept take $5\left(\mathrm{~cm}^{3}\right)$ sucrose and make up to $10\left(\mathrm{~cm}^{3}\right)$ with water / add equal volumes of water and sucrose and use $10\left(\mathrm{~cm}^{3}\right) /$ eq

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Edexcel IGCSE Biology 2.17 Diffusion and Osmosis Practical Questions question 1