Compare4 marksStandard
Compare the structural adaptations of a xylem vessel element and a phloem sieve tube element for their respective transport functions. In your answer, explain why the sieve tube element depends on the companion cell.
CAIE A Level Biology 9700 · Transport in plants
Transport in plants: compare 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.
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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