root pressure theory explain
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Root pressure is the transverse osmotic pressure within the cells of tge root
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(1) Root pressure theory is proposed by j. Pristley.
(2) Por transiocation of water, activity of living cells ol root is responsible.
(3) Absorption of water by root hair is a constant and continuous process and due to this a hydrostatic pressure is developed in corical celis.
(4) Owing to this hydrostatic pressure i.e. root pressure, water is forced into xylem and further conducted upwards.
(5) Root pressure is an osmolic phenomenon.
(6) Limitation of this theory:
- (i) Not applicable to tall plants above 20 years.
- (ii) Even in absence of root pressure ascent of Sap is noticed.
- (iii) In actively transpiring plants, root pressure is not developed.
- (iv) In taller gymnosperms, root pressure is Zero.
- (iV) Aylem sap is under tension and shows negative hydrostatic pressure.
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