CAIE A Level Biology 9700 · Transport in plants

Transport in plants: describe question

Describe5 marksStandard

A student treats a plant root with an enzyme that digests the suberin in the Casparian strip. Explain the role of the Casparian strip in the transport of water from the soil to the xylem, with reference to the apoplast and symplast pathways.

How this question is marked

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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