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Biology · May / June 2019 · Paper 12 · Question 12

5090Uptake and transport of water and ions

A plant was placed in water containing black dye. After 24 hours the plant was removed and sections were taken from the root and the stem. Which diagram shows the results?

  1. Aroot: central dark star-shaped region; stem: ring of dark vascular bundles
  2. Broot: central dark star-shaped region; stem: ring of dark vascular bundles (alternate arrangement)
  3. Croot: central dark star-shaped region; stem: dark central region with surrounding light bundles
  4. Droot: central dark star-shaped region; stem: entirely dark

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Correct answer: A. root: central dark star-shaped region; stem: ring of dark vascular bundles

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