Question

Cohesive force of water molecules is of the magnitude of

• A. 1 - 10 atm
• B. 10 - 15 atm
• C. 45 - 200 atm
• D. 15 - 45 atm

Answer 1

Answer: (C)

45 - 200 atm

Cohesive force is called as the tensile strength of water. It is the force which acts between the water molecules. The cohesive strength of 47-207 atm. in xylem sap is sufficient to meet the stress of transpiration pull so that water column does not break.

Thus, the correct answer is option (C).