Question

what is pressure flow or mass flow hypothesis

Answer 1

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. ... This creates turgor pressure, also known as hydrostatic pressure, in the phloem. Movement of phloem sap occurs by bulk flow from sugar sources to sugar sinks. 

Answer 2

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Pressure flow hypothesis is the one which explain the translocation of food molecules by phloem. The mechanism of translocation involves certain steps. *As sugar is synthesised in the leaves by the process of photosynthesis, a high concentration of organic substance inside the phloem cells of the leaf creates a diffusion gradient by which more water is sucked into the cells. *Phloem sap with lot of sugar moves from sugar sources (leaves) to sugar sinks with the help of turgor pressure.Sugar sources are the organs of the plant which synthesise sugars. Sugar sinks are the ones from where the sucrose is removed from the phloem. *Hydrostatic pressure increases in the phloem sieve tubes, pressure flow beginsand the sap moves through the phloem. *Osmotic pressure at the sink is reduced. Sucrose from the phloem sap is removed and given to the cells which utilise it by converting it into energy or starch or cellulose.



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