GCE O-Level · Biology (6093)

Diffusion: Practice Questions

5 multiple-choice questions marked as you go, and 1 written questions with worked solutions. All on Diffusion.

6 questions10 marksFree, no account

Question 1

1 mark

By which process does carbon dioxide move from the blood into the alveoli of the lungs?

Question 2

1 mark

Which row correctly compares the processes of simple diffusion and active transport across a cell membrane?

Question 3

1 mark

The diagram shows the exchange of substances across a capillary wall between blood plasma, tissue fluid, and body cells.

Which statement regarding the movement of oxygen and carbon dioxide is correct?

Question 4

1 mark

Which change would result in a decrease in the rate of diffusion of a substance across a membrane?

Question 5

1 mark

A tissue sample of plant roots was immersed in an aerated nutrient solution containing nitrate ions. A respiratory inhibitor, cyanide, was then added to the solution.

Which row correctly describes the effect on oxygen consumption and the subsequent rate of nitrate ion uptake by the root cells?

Question 6

5 marks

Describe the pathway and mechanism by which carbon dioxide molecules move from the air space inside a dicotyledonous leaf into the chloroplasts of palisade mesophyll cells during daytime photosynthesis.

Write your answer out first, then check it against the worked solution.

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