Question

explain the mass flow hypothesis of phloem movement​

Answer 1

Answer:

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.

Answer 2

Explanation:

➡️ Organic materials or nutrients to be transported are passed into the sieve tubes of the supply region by an active process. A high concentration of nutrients causes passage of water from xylem channel to the sieve tubes forming a concentrated solution. It creates a high turgor Pressure. The solution containing the nutrients flows towards the area of low turgor present as present in area of sink or utilisation. Since it is bulk transport caused by difference in turgor Pressure, the mode of translocation is called mass flow or pressure flow. This hypothesis was given by Munch (1930).

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