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Transport in Plants

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
In what way does the concept of water potential help in explaining water movement ?

Water potential is the potential energy of water which helps in the movement of water. Pure water has the highest water potential , pure water has a water potential equal to zero. When solute is added to the water it decreases its water potential. As we know that the cell having greater water potential has more concentration of water thus we can say that the movement of water will take place from high water potential to low water potential, as diffusion of water takes place from its high concentration to low concentration. Thus the concept of water potential help us to understand in which direction the water will move. 


Who introduced the apoplast—symplast concept ?

E. Munch (1930).

What is transmembrane pathway ?

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

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

Tensile strength

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. 

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.