This revision notes provide detailed explanations, clear and concise pictures and concepts to help users understand the topic of IGCSE GCSE 0610 Biology translocation.
The MOVEMENT of SUCROSE and AMINO ACIDS from the LEAVES (the SOURCE) to
GROWING REGIONS that are RESPIRING (the SINKS)
• The leaves are the source as sugars are made there, in photosynthesis.
• The growing regions are the sinks as sugars are transported there, and used in
respiration for growth
B. HOW SUCROSE IS TRANSPORTED IN THE PHLOEM
General principle
• Hydrostatic pressure is the pressure of a liquid – in this case, water.
• This is all about creating a hydrostatic (liquid) pressure gradient between the source
(leaves) and the sinks (growing regions = roots) from top to bottom.
• This is what makes the liquid containing dissolved sucrose move down.
SOURCE HIGH
HYDROSTATIC
(leaves) PRESSURE
SINKS LOW
HYDROSTATIC
(roots) PRESSURE
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