O-LevelBiologyPlant Nutrition5090/11 · Oct/Nov 2018 · Q71 Mark
The diagram represents a cross-section of part of a leaf. [Figure showing a cross-section of a leaf with 'X' pointing to an air space] How does the oxygen content of the air at X compare to normal atmospheric air when the leaf is in the light and when it is in the dark?
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.
Ain the light higher, in the dark lower
Bin the light higher, in the dark the same
Cin the light lower, in the dark higher
Din the light lower, in the dark the same
✓ Correct answer
A: in the light higher, in the dark lower
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