Biology 9700 · AS & A Level · Structure of transport tissues

Structure of transport tissues — practice question

The diagram illustrates a longitudinal section of transport tissue in a plant stem. What are the names of element X and the tissue in which it occurs?

  • Aelement X: sieve tube; tissue: phloem
  • Belement X: sieve tube; tissue: xylem
  • Celement X: vessel; tissue: phloem
  • Delement X: vessel; tissue: xylem

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