Explain4 marksStandard
In a tall tree, water is transported from the roots to the leaves through the xylem. Explain how the cohesion-tension mechanism, involving the properties of water and the structure of xylem, enables this transport.
CAIE A Level Biology 9700 · Transport in plants
Transport in plants: 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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