O-LevelBiologyTransport in Plants5090/11 · May/June 2011 · Q111 Mark
A herbaceous plant, growing in a nutrient solution, is placed in a well-lit experimental chamber through which humid air is being passed slowly. The diagram below shows a section through a part of the plant. The speeds of movement of the fluids in tissues P and Q are measured. The humid air is then replaced by dry air and the speeds of movement of the fluids change. What are these changes?
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.
Agreatly increased upward movement greatly increased downward movement
Bgreatly increased downward movement little change
Clittle change greatly increased downward movement
Dlittle change greatly increased upward movement
✓ Correct answer
D: little change greatly increased upward movement
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