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CAIE A Level Biology 9700 · Transport in plants

Transport in plants: explain question

Explain6 marksChallenge

A student is studying a photomicrograph of a transverse section of a leaf from a herbaceous dicotyledonous plant. The vascular bundles in the midrib show xylem positioned towards the upper (adaxial) epidermis and phloem towards the lower (abaxial) epidermis. Smaller vascular bundles are also present in the mesophyll. Using your knowledge of the structure and function of xylem and phloem, explain how the arrangement and cellular features of these tissues in the leaf are adapted to their roles in transport.

0 words · 6 marks

No account needed for your first marks. Your answer is used only to mark it.

How this question is marked

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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