What is mass flow or bulk flow ?

Mass flow is the movement of substances in bulk or  from one point to another as a result of pressure difference between the two points.
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Where unidirectional translocation occurs?

In rooted plants transportation in xylem is unidirectional from roots to the stems and leaves .
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Which transport is bidirectional  ?


Phloem transport is bidirectional. 
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What is symport ?

Symport : In this the proteins carry out diffusion of two molecules in the same direction. 
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What is translocation ?

Traslocation is the process by which bulk movement of substances take place through the vascular system in a  plant.
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