DENDROLOGY

TREE PHYSIOLOGY

TRANSPIRATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What property of water allows it to be pulled along the xylem when water evaporates from the leaves?
A
Adhesion
B
Cohesion
C
High boiling point
D
Good solvent
Explanation: 

Detailed explanation-1: -Capillary action draws water up within the xylem. Cohesion-tension pulls water up the xylem.

Detailed explanation-2: -Answer and Explanation: Three properties of a water molecule enable it to move from the root system to the leaves of the plant. They are cohesion, adhesion, and high surface tension.

Detailed explanation-3: -In the xylem vessels, water molecules are strongly attracted to each other and exhibit a “stickiness” called cohesion that is due to the formation of hydrogen bonds between different water molecules. The “stickiness” between water molecules and the xylem vessel walls is called adhesion.

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