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Sinks are related to

In vascular plants,what is the nature of the transport of organic and mineral nutrients in the phloem?

$A$ : The translocation in phloem is bidirectional.
$R$ : The source and sink relationship is variable.

When does the translocation of phloem sap in the phloem become bidirectional?

Analogy type questions:
$(1)$ In Xylem : Vessel :: In Phloem : ..........
$(2)$ Synthesis of food : Source :: Regions of need : ...........

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