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

Structure of transport tissues — practice question

The diagram illustrates how phloem sieve tube elements, xylem vessel elements and companion cells are related. Which statement is correct?

  • A1 companion cells, 2 endoplasmic reticulum, 3 phloem sieve tube elements, 4 nucleus absent, 5 xylem vessel elements
  • B1 companion cells, 2 nucleus, 3 phloem sieve tube elements, 4 cytoplasm, 5 xylem vessel elements
  • C1 phloem sieve tube elements, 2 mitochondria, 3 companion cells, 4 nucleus, 5 xylem vessel elements
  • D1 xylem vessel elements, 2 cytoplasm absent, 3 phloem sieve tube elements, 4 vacuole, 5 companion cells

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