Class 11 Biology - Chapter Transport in Plants NCERT Solutions | Will the ascent of sap be possible witho
Will the ascent of sap be possible without the cohesion and adhesion of the water molecules? Explain.
No, it is not possible, Ascent of sap is not possible without cohesion and adhesion of water molecules. There are several other factors like root pressure, capillary action, adhesion, cohesion and transpiration that are involved in ascent of sap in plants. Root pressure can only move water up to the base of the stem. Capillary action is effective only in herbs because it can raise water only up to few centimeters. Transpiration works only when there is water column underneath to be pulled. The continuous water flow in xylem vessels for ascent of sap is regulated by cohesive and adhesive forces of water molecules. If these forces are not present then it will lead to the breakage of water column or the sap movement upwards.
More Questions From Class 11 Biology - Chapter Transport in Plants
- Q:- Explain why xylem transport is unidirectional and phloem transport bi-directional.
- Q:- (a) With the help of well-labelled diagrams, describe the process of plasmolysis in plants, giving appropriate examples.
(b) Explain what will happen to a plant cell if it is kept in a solution having higher water potential. - Q:- What role does root pressure play in water movement in plants?
- Q:- Explain pressure flow hypothesis of translocation of sugars in plants.
- Q:- What are the factors affecting the rate of diffusion?
- Q:- What are porins? What role do they play in diffusion?
- Q:- Describe transpiration pull model of water transport in plants. What are the factors influencing transpiration? How is it useful to plants?
- Q:- Explain why pure water has the maximum water potential.Explain why pure water has the maximum water potential.
- Q:- Briefly describe water potential. What are the factors affecting it?
- Q:- What causes the opening and closing of guard cells of stomata during transpiration?
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