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Movement of substances into and out of cells

Movement of substances into and out of cells

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Question 20

A student investigates osmosis using three identical cylinders of potato tissue.

The student:

  • measures the initial mass of each potato cylinder
  • places one potato cylinder into a beaker of distilled water
  • places a second potato cylinder into a beaker of 0.4 M0.4\text{ M}0.4 M sucrose solution
  • places a third potato cylinder into a beaker of 1.0 M1.0\text{ M}1.0 M sucrose solution
  • leaves the cylinders for 2 hours, then removes them, blots them dry, and measures their final mass.

The table shows the student's results:

TreatmentInitial mass (g)Final mass (g)
Distilled water5.05.6
0.4 M0.4\text{ M}0.4 M sucrose5.04.8
1.0 M1.0\text{ M}1.0 M sucrose5.04.1
a.

Name the dependent variable in this experiment.

[1]
b.

Explain the result for the potato cylinder placed in distilled water.

[2]
c.

Calculate the percentage change in mass for the potato cylinder placed in 1.0 M1.0\text{ M}1.0 M sucrose solution. Show your working.

[2]
d.

Give one way in which osmosis differs from simple diffusion.

[1]
Markscheme

Movement of substances into and out of cells Questions

  1. IGCSE
  2. /Biology
  3. /Movement of substances into and out of cells

23 exam-style questions on Edexcel IGCSE Biology Movement of substances into and out of cells. Each one has a worked solution and a mark scheme showing where the marks go.

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