3. Movement into and out of cells
A section of Biology, 0610
Listing 10 of 315 questions
For Examiner's Use Define diffusion. shows an apparatus that was used to investigate the effect of concentration of a chemical on the rate of diffusion. pieces of damp blue litmus paper at 2 cm intervals cork cork cotton wool soaked in ethanoic acid As ethanoic acid diffused along the tube, the pieces of blue litmus paper turned red. For Examiner's Use Table 3.1 distance of blue litmus paper along tube / cm time for blue litmus paper to turn red / s Complete by plotting the results shown in Table 3.1. Plot the results shown in Table 3.1 on the grid, , on page 6. State which sample of ethanoic acid, A, B or C, took the longest time to travel 8 cm along the tube. State and explain which sample of ethanoic acid was the most concentrated. Substances can enter and leave cells by either diffusion or by osmosis. State two ways in which osmosis differs from diffusion.
0610_s12_qp_21
THEORY
2012
Paper 2, Variant 1
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