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

Structure of transport tissues — practice question

Four students were each asked to propose a set of four labels for a plan diagram showing a transverse section of a dicotyledonous leaf. Which student, A, B, C or D, proposed the correct set of labels?

  • Alabel 1: lower epidermis; label 2: phloem; label 3: spongy mesophyll; label 4: palisade mesophyll
  • Blabel 1: phloem sieve tubes; label 2: upper epidermis; label 3: spongy mesophyll; label 4: xylem vessel elements
  • Clabel 1: spongy mesophyll; label 2: endodermis; label 3: xylem vessel elements; label 4: palisade mesophyll
  • Dlabel 1: waxy cuticle; label 2: xylem; label 3: companion cells; label 4: spongy mesophyll

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