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CAIE A-Level Biology 7.2.6 Assimilate Transport in Phloem

Practise identifying sources and sinks, tracing sucrose and amino acids in phloem sap and interpreting tracer or interrupted-tissue evidence for direction and transfer.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • identify a source as assimilate exporter and a sink as net importer or user
  • state that sucrose and amino acids move dissolved in phloem sap between sources and sinks
  • interpret tracer or tissue-interruption evidence for direction and possible transfer between tissues

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