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
Write the two limitations of traditional breeding technique that led to the promotion of micropropagation.
Name the technology that has helped scientists to propagate on a large scale the desired crops in a short duration. List the steps carried out to propagate the crops by the said technique.
Name any five hybrid varieties of crop plants which have been developed in India.
How can healthy potato plants be obtained from a desired potato variety which is viral infected? Explain.
Which of the following method is NOT used for crop improvement?
In virus-infected plants the meristematic tissues in both apical and axillary buds are free of virus because ______.
To isolate protoplast, one needs ______.
The culture medium (nutrient medium) can be referred to as a ‘highly enriched laboratory soil. Justify the statement.
“Give me a living cell of any plant and I will give you a thousand plants of the same type” Is this only a slogan or is it scientifically possible? Write your comments and justify them.
Explain the concept of tissue culture.
