Transport in xylem is unidirectional while transport in phloem is multi directional but food as well as water has to reach all parts so transport in xylem should also be multi direction but why not.
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because when water is sucked by the root and transported to the top of the plant ,the xylem eventually distributes water from the base to the top of plant while carring to the top. whereas the food prepared by the leaves has to reach all parts of plant including upwards and downwards so phloem are multi directional whereas xylem is unidirectional
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