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A-Level Biology OCR A

Sieve Tube Elements Cells Companion Describe Structure Phloem

Front Describe the structure of phloem.
Back Phloem structure:
  • Long hollow tubes made of living cells
  • Consist of sieve tube elements and companion cells
  • Sieve tube elements form tube to transport assimilates
  • Sieve plates found in between sieve tube elements
  • Companion cells are linked to sieve tube elements by plasmodesmata, fulfill metabolic needs ot sieve tube elements as they have lost normal cell functions and have no nucleus

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