Question

explain pressure flow hypothesis of translocation of sugar in plant

Answer 1

Explain pressure flow hypothesis of translocation of sugars in plants. 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.

Answer 2

NCERT based Answer for Class 11 Biology Students

Pressure Flow or Mass Flow Hypothesis:

 As glucose is prepared at source by photosynthesis, it is converted to sucrose (a disaccharide).

 Sugar then moves in form of sucrose into companion cells and then into sieve tube cells by active transport.

 This process of loading at the source produces a hypertonic condition in phloem.

 Water from adjacent xylem moves into phloem by osmosis.

 As osmotic pressure builds up, the phloem sap will move to areas of lower pressure i.e. sinks.

 Again active transport is required to move sucrose out of phloem sap into cells (of sink) which will use sugar as source of energy or convert it into starch or cellulose.

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