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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 12

An investigator studies osmosis using three cylinders of sweet potato tissue.

The investigator:

  • measures the initial mass of each sweet potato cylinder
  • places the first cylinder into a beaker of distilled water
  • places the second cylinder into a beaker of 0.3 M0.3\text{ M}0.3 M sodium chloride solution
  • places the third cylinder into a beaker of 0.9 M0.9\text{ M}0.9 M sodium chloride solution
  • leaves the cylinders for 3 hours, then removes them, blots them dry, and measures their final mass.

The table shows the investigator's results:

TreatmentInitial mass (g\text{g}g)Final mass (g\text{g}g)
Distilled water7.88.58
0.3 M0.3\text{ M}0.3 M sodium chloride8.27.79
0.9 M0.9\text{ M}0.9 M sodium chloride7.56.30
a.

Name the dependent variable in this experiment.

[1]
b.

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

[2]
c.

Calculate the percentage change in mass for the sweet potato cylinder placed in 0.9 M0.9\text{ M}0.9 M sodium chloride 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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