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Phloem transport - Coggle Diagram
Phloem transport
UNDERSTANDINGS
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High concentrations of solutes in the phloem at the source lead to water uptake by osmosis. Incompressibility of water allows transport along hydrostatic pressure gradients
The active transport of organic compounds into the phloem by companion cells makes the sap solution hypertonic
This causes water to enter the phloem from the xylem through osmosis as water travels from high solute concentration to low solute concentration
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increase in hydrostatic pressure forces the phloem sap to move towards areas of lower pressure, thereby transporting compounds to the sink
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Translocation rate
could be monitored by introducing radioactive carbon dioxide in the plant. Aphids have a stylet that extracts the sap from the phloem
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rate of phloem transport (translocation rate) can be calculated based on the time taken for the radioisotope to be detected at different positions along the plant’s length