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  • Passive absorption of water by the root system is the result ofOption: 1 Osmotic force in the shoot system<stro

Passive absorption of water by the root system is the result of

Option: 1

Osmotic force in the shoot system


Option: 2

Tension on the cell sap due to transpiration


Option: 3

Forces created in the cells of the root


Option: 4

Increased respiratory activity in root cells


Answers (1)

best_answer
 
  • Passive absorption of water occurs due to the negative force generated in the shoot system.
  • Due to the high rate of transpiration, the leaves lose water at a high rate. 
  • The loss of water increases the osmotic pressure of the mesophyll cells of the leaves.
  • Their water potential is set at low as well.
  • They start drawing water from the adjacent cells.
  • This results in the continuous build up of tension.
  • The cells of the leaves draw water from the xylem elements of the midrib which in turn draw water from the xylem elements of the stem.
  • The xylem elements of the stem ultimately draws water from the roots, where water potential is high.
  • Hence, roots only serve as a pathway for water absorption. These are not actively involved in the process.
  • Since roots are working as passive organs, this and there is no expenditure of energy in the absorption of water, this mechanism of water absorption through roots is called passive absorption.
  • Roots absorb water due to tension created by transpiration called the transpiration pull.

Passive absorption of water occurs due to the negative force generated in the shoot system. This force is generated due to transpiration and is called transpiration pull. Roots only serve as a pathway for water absorption. Hence, the correct answer is option b. 

 

Posted by

Pankaj Sanodiya

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