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Question
Answer the following question.
Discuss theories of water translocation.
Solution
Theories of water translocation:
- Various theories have been put forth to explain the mechanism of translocation of water. These theories include the Vital force theory, Relay pump theory, Physical force theory, Root pressure theory, etc.
- Root Pressure Theory (Vital Theory): This theory was proposed by J. Priestley. According to this theory, the activity of living cells of the root is responsible for the translocation of water.
- Capillarity theory (physical force theory): This theory was put forth by Boehm in (1863). According to this theory, physical forces and dead cells are responsible for the ascent of sap.
- Cohesion-tension theory (Transpiration pull theory): This theory was put forth by Dixon and Jolly (1894). This is presently a widely accepted theory explaining the ascent of sap in plants. This theory is based on two principles i.e. Cohesion and adhesion, and transpiration pull.
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RELATED QUESTIONS
Name the conducting tissue in plants which is made of dead cells.
What is transpirational pull?
Long answer question.
Explain cohesion theory for translocation of water.
Find the physical process NOT involved in absorption of water in plants.
Oozing of sap from the cut end of herbaceous plants is due to ____________.
The process in which the loss of water takes place in the form of water vapour through stomata is called:
Root pressure theory was proposed by ______.
Attraction of water molecules to polar surface is known as ______.
In vascular plants, growth takes place due to
Arrange and rewrite the terms in group in correct order to be in a logical sequence, beginning with the term that is underlined:
Water vapour, Soil water, Leaves, Ascent of Sap.
