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CAIE A-Level Biology 7.1.4 Plant Transport Structure and Function

Practise linking lignified hollow xylem vessels to low-resistance water flow and support, and sieve plates with companion-cell metabolism to assimilate translocation.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • link lignified walls with waterproof support and prevention of xylem-vessel collapse
  • explain low resistance through hollow vessel lumens and absent cross walls
  • connect sieve plates and companion-cell metabolism with phloem translocation

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