what are the merits and demerits of mass flow model?

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Solution

Merits
Mass flow model explains the mechanism of translocation of organic nutrients through the phloem. It can be explained experimentally.
Demerits
Mass flow model assumes that cells at the source end should be turgid. However, in reality these cells are often found to be flaccid as in case of germinating tubers, corms, etc.

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