Which of the following mechanisms can explain | vedclass

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(A) Munch $(1930)$ proposed the pressure-flow hypothesis,which best explains the transport of organic nutrients from the source (supply) to the sink (

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Osmotic movement of water into sugar-loaded sieve tube cells,which creates a higher hydrostatic pressure in the source than in the sink.

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(A) Munch $(1930)$ proposed the pressure-flow hypothesis,which best explains the transport of organic nutrients from the source (supply) to the sink (utilization site).According to this theory,the source has a higher osmotic concentration than the sink.When organic substances from mesophyll cells (acting as the source) are passed to the sieve tube of the phloem through companion cells by active transport,a high osmotic concentration is developed in the sieve tube,which acts as the source.Water is absorbed by the sieve tubes from the adjacent xylem,developing a high turgor pressure.Thus,the translocation of organic nutrients takes place from a region of higher turgor pressure to an area of lower turgor pressure.

Which of the following mechanisms can explain the transport of sucrose from source to sink?

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