The transport of food in phloem is:

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(C) The transport of food in phloem is bidirectional. It occurs from the source (where food is synthesized,e.g.,leaves) to the sink (where food is con

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Both $(a)$ and $(b)$

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(C) The transport of food in phloem is bidirectional. It occurs from the source (where food is synthesized,e.g.,leaves) to the sink (where food is consumed or stored,e.g.,roots,fruits,or developing buds). Since the source can be above or below the sink,the movement can be both downward (basipetal) and upward (acropetal). Therefore,the transport of food in phloem is bidirectional.

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