Which of the following explains bidirectional transport of solutes in phloem tissue

Mass flow hypothesis

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Transcellular strands hypothesis

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Electro-osmotic hypothesis

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All of these

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Solution

The correct option is A Mass flow hypothesis
The Pressure Flow Hypothesis, also known as the Mass Flow Hypothesis, is the best-supported theory to explain the movement of sap through the phloem. It was proposed by Ernst Munch, a German plant physiologist in 1930. The movement in phloem is bidirectional, whereas, in xylem cells, it is unidirectional (upward).
So, the correct option is, 'Mass flow hypothesis'.

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The transport in xylem in usually unidirectional, whereas in phloem it is bidirectional.

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