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A-Level Biology OCR A

Water Assimilates Moves Pressure Source Buildup Companion Cell

Front Describe how water and assimilates in phloem move from source to sink.
Back Movement from source to sink:
  • As result of buildup of sucrose in companion cell and sieve tube element, water moves in by osmosis
  • Buildup of turgor pressure due to rigid cell walls
  • Water carrying assimilates moves into tubes of sieve elements
  • This reduces pressure in companion cells
  • Water carrying assimilates moves up/down the plant by mass flow to areas of lower hydrostatic pressure (sinks)

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