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Transport in Plants

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
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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Why the water is forced to move through cell membrane beyond endodermis ?

Water is forced to move through cell membranes beyond endodermis because of the suberin (waxy substance) present on radial walls of endodermal cells blocks water and solute movement through cell walls of endodermis. 
923 Views

Who introduced the apoplast—symplast concept ?

E. Munch (1930).
630 Views

Give the term for the ability to resist a pulling force.

Tensile strength
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What is transmembrane pathway ?

The movement of water through cell membranes is called trans membrane pathway.
1112 Views

Why the cortex produces no resistance to movement of water ?

The cortical cells are loosely packed and produce no resistance to movement of water via cell walls or apoplast.
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