May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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29Plant Structure TransportEasy1 mark
The electron micrograph shows part of a leaf.
Figure 29, a scanning electron micrograph of xylem tissue in a leaf, showing several vessel elements with helical or ringed wall thickenings running around their lumens; a bracket labelled M spans the full length of one large, central vessel element.
What is a function of structure M?