Discuss root pressure responsible for ascent of sap from Biology Transport in Plants Class 11 Assam Board
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Transport in Plants

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Biology

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Biology

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Discuss root pressure responsible for ascent of sap

Root pressure : It is a positive force. It is due to the osmosis of water, from the soil into the root cells and the active pumping of salts into the xylem tissue, which maintains a concentration gradient along which the water will move. It is responsible for the ascent of sap to small heights.

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What is transmembrane pathway ?

The movement of water through cell membranes is called trans membrane pathway.
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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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Who introduced the apoplast—symplast concept ?

E. Munch (1930).
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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. 
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Give the term for the ability to resist a pulling force.

Tensile strength
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