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Back to Edexcel Biology Paper 1 Specimen (set 1) Home

B1 H - Sample set 1 Q5

5) Diffusion, active transport and osmosis can be used to move substances into and out of cells.
(a) A student was investigating osmosis in potato cubes.
He used the following method:
  • cut a potato into equal-sized cubes
  • record the mass of each potato cube
  • place each potato cube into different concentrations of salt solution
  • remove the potato cubes after 30 minutes
  • dry the potato cubes and record the final mass of each cube.
​He plots his results on a graph shown in Figure 6.
Picture
The method controls a number of variables.
(i) Name one other variable that needs to be controlled during the student’s investigation. (1)

(ii) Give a reason why the potato cube must be dried. (1)

(iii) Explain the conclusion that can be made about point Q on Figure 6. (2)

(iv) Give one way that the student could obtain more data to increase the accuracy of point Q. (1)

(b) Osmosis is one method that single-celled organisms, such as bacteria, use to obtain molecules from their environment.
​Which of the following is a correct description of a process involving the transport of molecules? (1)
Picture
(c) Figure 7 shows some Vibrio cholerae, the bacteria that cause cholera.
Picture
The length of one flagellum on Figure 7 is 68mm.
Calculate the length of the flagellum in µm. (3)
​
............................................................. µm

(Total for Question 5 = 9 marks)

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