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Explain Pressure Flow Hypothesis of Translocation of Sugars in Plants - Biology

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ConceptPhloem Transport - Pressure Flow Or Mass Flow Hypothesis

Question

Explain pressure flow hypothesis of translocation of sugars in plants.

Solution

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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APPEARS IN

 NCERT Solution for Biology Textbook for Class 11 (2018 to Current)
Chapter 11: Transport in Plants
Q: 15 | Page no. 193
Solution Explain Pressure Flow Hypothesis of Translocation of Sugars in Plants Concept: Phloem Transport - Pressure Flow Or Mass Flow Hypothesis.
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