O-LevelBiologyPlant Nutrition5090/12 · May/June 2015 · Q61 Mark
A plant has leaves that are green in the centre but white around the edges. The plant is destarched and then has one of its leaves partly covered with black paper on both sides of the leaf, as shown. [Diagram] The plant is placed in bright light for 48 hours. The leaf is then tested for starch. Which diagram shows the colours that are obtained?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
ADiagram of a leaf with the top region labelled 'brown', the covered central region labelled 'black', and the bottom region labelled 'brown'.
BDiagram of a leaf with the top region labelled 'brown', the covered central region labelled 'black', and the bottom region labelled 'black'.
CDiagram of a leaf with the top region labelled 'black', the covered central region labelled 'brown', and the bottom region labelled 'black'.
DDiagram of a leaf with the top region labelled 'black', the covered central region labelled 'brown', and the bottom region labelled 'brown'.
✓ Correct answer
A: Diagram of a leaf with the top region labelled 'brown', the covered central region labelled 'black', and the bottom region labelled 'brown'.
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