Question

Explain pressure flow hypothesis of translocation of sugars in plants.

Answer 1

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Ans:- According to the pressure flow hypothesis, food is prepared in the plant leaves in the form of glucose. Before moving into the source cells present in the phloem, the prepared food is converted into sucrose. Water moves from the xylem vessels into the adjacent phloem, thereby increasing the hydrostatic pressure in the phloem. Consequently, the sucrose moves through the sieve cells of the phloem. The sucrose already present in the sink region is converted into starch or cellulose, thereby reducing the hydrostatic pressure in the sink cells. Hence, the pressure difference created between the source and the sink cells allows sugars to be translocated from the former to the latter. This starch or cellulose is finally removed from the sink cells through active transport.

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Answer 2

Answer1 transport of food sucrose in pholem is bidirectional

2 leaf is a source for phloem transport and sink in any part that need food

3 pholem sap consist of water, amino acid, hormones, sucrose.

4 hypothesis is given by munch.

5 glucose is prepared at the source by photosynthesis.

6 sucrose is moved into the campanion cell and then into sieve tube by active transport of mesophyll cells.

7 this process loading at the source produces hyperronic condition

Example water potential decreases

Explanation: