CAIE A Level Biology 9700 · Transport in plants
In a transverse section through the leaf of a herbaceous dicotyledonous plant, the vascular bundles (veins) show a characteristic arrangement of xylem and phloem. Explain how the distribution and structure of xylem and phloem in this leaf transverse section are adapted to their functions.
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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