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Q.
Why the transport of organic food through phloem is bidirectional?
Transport in Plants
Solution:
Long distance transport of the substances takes place through bulk flow system. Organic nutrients are supplied over long distance transport by phloem tissue from source to sink region. The direction of transport of these organic nutrients can be upward or downward, i.e. bidirectional. This is due to the variable relationship between synthesis region or source site and sink or utilisation region.