A-LevelBiologyTransport in plants9700/12 · May/June 2025 · Q271 Mark
Which features of companion cells and xylem vessel elements make them suitable for their function?
Acompanion cells: transport contents of cell in one direction only, xylem vessel elements: lignified walls provide support
Bcompanion cells: cellulose walls provide support, xylem vessel elements: nuclei allow cell division
Ccompanion cells: nuclei allow cell division, xylem vessel elements: gaps between cells allow rapid transport
Dcompanion cells: numerous mitochondria supply energy, xylem vessel elements: absence of cytoplasm allows mass flow
✓ Correct answer
D: companion cells: numerous mitochondria supply energy, xylem vessel elements: absence of cytoplasm allows mass flow
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