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Cohesion force existing amongst water mo...

Cohesion force existing amongst water molecules contributes to
(a) plasmolysis
(b) Ascent of sap
(c) Osmosis
(d) Translocation

A

plasmolysis

B

Ascent of sap

C

Osmosis

D

Translocation

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the contribution of cohesion forces among water molecules, we need to analyze each option provided: ### Step-by-Step Solution: 1. **Understanding Cohesion Force**: - Cohesion refers to the attraction between molecules of the same substance. In the case of water, it is the hydrogen bonds that create a strong cohesive force among water molecules. 2. **Analyzing Each Option**: - **(a) Plasmolysis**: This is the process where plant cells lose water in a hypertonic solution, leading to the shrinkage of the cell. It is primarily due to exoosmosis, not cohesion. Therefore, this option is incorrect. - **(b) Ascent of Sap**: The ascent of sap refers to the upward movement of water and nutrients from the roots to the leaves. This process is significantly aided by cohesion forces, as the water molecules stick together, creating a continuous column of water in the xylem vessels. This option is correct. - **(c) Osmosis**: Osmosis is the movement of water across a semi-permeable membrane from a region of lower solute concentration to a region of higher solute concentration. While it involves water movement, it does not directly involve cohesion forces. Thus, this option is incorrect. - **(d) Translocation**: Translocation refers to the movement of nutrients (like sugars) in the phloem. This process does not involve cohesion forces related to water molecules. Therefore, this option is also incorrect. 3. **Conclusion**: - Based on the analysis, the correct answer is **(b) Ascent of sap**, as cohesion forces among water molecules play a crucial role in this process. ### Final Answer: (b) Ascent of sap
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