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Transport in Plants

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Describe the mechanism of passive water absorption.

Mechanism of passive water absorption: 

The water moves through the apoplast pathway in a passive way. The direction of the movement of water is according to the concentration gradient and hence no energy is required for the same. The water is absorbed in the following way -: 

1. Root hairs have low water potential as compared to the soil. Thus, root hairs absorb water from the soil.

2. The water from soil enters into root hairs due to osmosis.

3. The cortical cells just adjoining to epidermal cells with root hair have much more osmotic pressure than root hair cells. Thus, water from epidermal cells diffuses into cortical cells adjoining them. The water diffuses passively through the cortical cells until they reach the casparian stripe which are suberized.  



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

Tensile strength

Who introduced the apoplast—symplast concept ?

E. Munch (1930).

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.

What is transmembrane pathway ?

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

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.