Do munch's hypothesis of bulk transpot in phloem explains bi directional transport , if so how??

Dear student,
Yes, Munch's Hypothesis of bulk transport explain the bidirectional transport in the phloem.
The Mass Flow Hypothesis  was proposed by Ernst Munch.
A high concentration of organic substances such as sugar inside cells of the phloem at a source, such as a leaf, creates a diffusion gradient  that draws water into the cells from the adjacent xylem. This creates hydrostatic pressure  in the phloem.
Movement of phloem sap occurs by bulk flow (mass flow) from sugar sources to sugar sinks.
The movement in phloem is bidirectional, whereas, in xylem cells, it is unidirectional (upward).

Hope this information will clear your doubts about topic.

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