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1.4 Transport across cell membranes

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Question 4
F

A student investigated osmosis in potato tissue.

The Figure shows the apparatus used.

Figure image This is the method used.

  • Use a cork borer to cut five cylinders of potato.
  • Blot each cylinder dry with a paper towel and measure its mass.
  • Place one cylinder into each boiling tube.
  • After 30 minutes, remove each cylinder, blot it dry and measure its mass again.
a.

Give the independent variable in this investigation.

[1]
b.

Explain why the student blotted each cylinder dry before measuring its mass.

[2]
c.

Give two variables that the student should control.

[2]
d.

Describe how the student could make the results more repeatable.

[1]
Markscheme

1.4 Transport across cell membranes Questions

  1. GCSE
  2. /Biology
  3. /1.4 Transport across cell membranes

41 exam-style questions on Edexcel GCSE Biology 1.4 Transport across cell membranes, covering 1.4.1 Transport into and out of cells and 1.4.2 Percentage gain and loss in osmosis. Each one has a worked solution and a mark scheme showing where the marks go.

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