May/June 2026 Paper 23

2026 · 40 questions · 40 parts · 40 marks

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10Plant Structure TransportEasy1 mark
The diagram shows a cross-section of a leaf. Which structure is a guard cell?
Cross-section of a leaf with four cells labelled: A the lowest cell of the layer of tall column-shaped cells, B a cell of the upper surface layer, C a small cell beside a gap in the lower surface layer, and D a larger rounded cell in the lower surface layer