On what properties of water does the ascent of xylem sap depend?

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 Multiple Choice QuestionsShort Answer Type

41. What is wilting ?
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42. What is transpiration flux ?
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43. What is cohesion?
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44. 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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 Multiple Choice QuestionsLong Answer Type

45. Describe the mechanism of passive water absorption.
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 Multiple Choice QuestionsShort Answer Type

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47. Describe active absorption.
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49. What are photoactive stomata ?
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