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The movement of substances in the phl...

The movement of substances in the phloem can be in any direction .

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(i) Reason : phloem transports food (sucrose ) from a source to a sink . The source is part of the plant that synthesize food . i.e., the leaf , and sink , is the part that needs or stores the food .
(ii ) but , the source and sink may be reversed depending on the season , or the plant's need .
(iii ) the direction of movement in the phloem can be upwards of downwards , i.e, bi - directional .
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