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Transport in Plants

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
What is the value of water potential to fully turgid cell and why ?

Water potential of full turgid cells is zero. Fully turgid cell has the highest water potential . As water enters the cell the water apllies pressure against the walls of the cell. In the case of a fully turgid cell, no more water can enter the cell, thus it has the highest water potential. The pressure potential becomes equal to the solute potential in magnitude. The solute potential is negative and the pressure potential is postive. Water potential is given by the equation -
 ψw  = ψs  + ψp 
Therefore the water potential becomes zero when solute potential becomes equal to the pressure potential. 

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. 

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

Tensile strength

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.

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.