CAIE A Level Biology 9700 · Transport in plants
Describe the structural features of xylem vessel elements and phloem sieve tube elements in a herbaceous dicotyledonous plant, and explain how each feature relates to their respective functions. Present your answer in the form of a table with columns for 'Cell type', 'Structural feature', and 'Functional adaptation'. Include at least three distinct features for each cell type.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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