Explain4 marksStandard
During strenuous exercise, muscle cells produce large amounts of carbon dioxide. Explain the role of carbonic anhydrase in the transport of this carbon dioxide from the muscle cells to the lungs.
CAIE A Level Biology 9700 · Transport in mammals
Transport in mammals: explain question
How this question is marked
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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