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2.1 Supplying the cell

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Question 36

A student investigates the effect of different concentrations of salt (sodium chloride) solution on cylinders of potato.

This is the method that they use:

  • Step 1: Cut five cylinders of potato tissue.
  • Step 2: Place each potato cylinder in a test tube containing a different concentration of salt solution.
  • Step 3: Leave the potato cylinders in the solutions for 4 hours.
  • Step 4: Remove the potato cylinders from the solutions.
a.

The student wants to calculate the percentage change in mass for each potato cylinder. Describe the additional steps needed in the method to find the required data.

[3]
b.

State two variables that the student should control in this investigation.

[2]
c.

Describe how the student could find out if their data is both repeatable and reproducible.

[3]
d.

Some of the potato cylinders decreased in mass. Explain why some of the potato cylinders will decrease in mass.

[2]
Markscheme

2.1 Supplying the cell Questions

  1. GCSE
  2. /Biology
  3. /2.1 Supplying the cell

82 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.

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