Question

What is the ascent of sap? Explain cohesion -tension for it notes

Answer 1

Hint: The theory states that transpiration pull or tension, attachment property of water, and hydration of the cell dividers (i.e., grip) are on the whole liable for the climb of sap. Water development through the xylem is a mass stream brought about by (pressure distinction) between one finish of the framework and the other.

Complete answer:
Ascent of sap: It is the important tissue which is present in the xylem tissue of the plant. It plays a major role in the transportation of the water and the minerals from the roots to the crown of the plant. The xylem in the plant contains both the living and the non-living cells in it. Also, the water and minerals conducting cells in the xylem are mostly non-living cells.

Cohesion-tension theory: The force of the attraction between the subjective water molecules is called the cohesive force. This force tends the water molecules to stick to each other, it cannot be separable. The force of the attraction between the water molecules and the xylem wall is called the adhesion force. The combination of the cohesion and the adhesion tends the water molecule to flow from the roots to the crown against the gravitational force.

Note:The upward development of water and minerals from roots to various plant parts is called rising of sap. Bond union of Water Molecules: Water particles make a persistent segment in the xylem on account of powers of grip and attachment among the atoms.