Compare7 marksChallenge
Compare the structure of a phloem sieve tube element and a companion cell in a herbaceous dicotyledonous plant. For each cell, explain how its structural features relate to its role in the transport of organic solutes.
CAIE A Level Biology 9700 · Transport in plants
Transport in plants: compare question
How this question is marked
7 marks, so the mark scheme is looking for about 7 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
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