CAIE A Level Biology 9700 · Transport in plants
Xylem vessel elements in herbaceous dicotyledonous plants are highly adapted for the transport of water and mineral ions. With reference to specific structural features, explain how xylem vessel elements are suited to this function.
6 marks, so the mark scheme is looking for about 6 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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