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

Structure of transport tissues — practice question

The photomicrograph depicts a vascular bundle taken from a plant stem. Which labels are correct for structures X, Y and Z?

  • AX: companion cell, Y: sieve tube element, Z: air space
  • BX: sieve tube element, Y: xylem vessel element, Z: air space
  • CX: xylem vessel element, Y: companion cell, Z: sieve tube element
  • DX: xylem vessel element, Y: sieve tube element, Z: companion cell

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