CAIE A Level Biology 9700 · Biological molecules
Bamboo shoots grow rapidly and need strong cell walls to support their height. The primary cell walls of bamboo are rich in cellulose. Explain how the molecular structure of cellulose enables it to provide mechanical strength to plant cell walls.
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.
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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