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The Munch pressure flow model explains the mechanism of translocation of organic solutes, mainly sugars, in the phloem of higher plants. According to this model, proposed by Ernst Munch in 1930, the movement of solutes occurs due to a pressure gradient generated between the source and the sink. The source is the site of sugar production or storage, typically mature leaves, while the sink is the site of sugar ______ _______ ______ _____ ___ ________ _________ ________.
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