Advertisements
Advertisements
प्रश्न
Explain the transpiration pull theory for an ascent of sap
Advertisements
उत्तर
Transpiration pull theory: Water is lost from the mesophyll cells to the intercellular spaces and eventually outside as a result of transpiration. Due to loss of water from mesophyll cells, DPD increases, and such cells, absorb water from the adjoining cells. Ultimately water is absorbed from xylem elements of vascular bundles. Since there is a continuous column of water in the xylem elements, a tension or pull is transmitted from the petiole to stem and finally to roots the resulting in an upward movement of water.
APPEARS IN
संबंधित प्रश्न
What is 'tissue culture'?
Explain micropropagation and somatic hybridization.
Mention two advantages of the micropropagation technique.
In the following questions/statements has four suggested answers. Rewrite the correct answer
Roots and shoots lengthen through the activity of:
(A) Apical meristem
(B) Vascular Cambium
(C) Lateral meristem
(D) Cork Cambium
Define the term tissue.
Give one significant difference between :
ECG and EEG
Identify labels P, Q, R in the given figure of root showing different regions.
Which of the following method is NOT used for crop improvement?
Callus is ______.
Write a short note on callus culture.
