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What is cohesion?


Cohesion is the mutual attraction between similar molecules. Like the force of mutual attraction between water molecules.
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What is absorption lag ?

Absorption lag is the decrease in rate of water absorption over the rate of transpiration.
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What is transpiration flux ?

Transpiration flux is defined as the quantity of water transpired by a unit area of leaf surface in a unit time.
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On what properties of water does the ascent of xylem sap depend?

The ascent of xylem sap depends on the following properties of water :

i. Cohesion – It is themutual attraction between water molecules.
ii. Adhesion – It is the attraction of water molecules to polar surfaces (such as the surface of tracheary elements).
iii. Surface Tension – The water molecules are attracted to each other in the liquid phase more than to water in the gas phase.

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What is wilting ?

Wilting is condition when a leaf become limp of droops due to excessive heat and loss of water. 
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