CAIE A Level Biology 9700 · Control and coordination
A person eats a piece of fruit and detects a sweet taste. Explain the sequence of events that occurs from the binding of sugar molecules to chemoreceptors on a taste bud to the generation of an action potential in the sensory neurone.
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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