Class 11 Biology - Chapter Transport in Plants NCERT Solutions | Explain pressure flow hypothesis of tran

Welcome to the NCERT Solutions for Class 11th Biology - Chapter Transport in Plants. This page offers a step-by-step solution to the specific question from Excercise ".$ex_no." , Question 15: explain pressure flow hypothesis of translocation....
Question 15

Explain pressure flow hypothesis of translocation of sugars in plants.

Answer

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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