In this article we will discuss about the meaning and theories of ascent of sap. Meaning of Ascent of Sap: Plants lose enormous amounts of water by transpiration. Water is absorbed from the soil and is conducted upwards through roots and stems ultimately to reach the leaves. This becomes possible due to the presence of continuous conducting channels in the [...]
The following points highlight the three main theories regarding ascent of sap. The theories are: 1. Vital-Force Theory 2. Root-Pressure Theory 3. Physical-Force Theory. Theory # 1. Vital-Force Theory: These theories state that the vital capacity of the living cells is responsible for the ascent of sap. Living cells like xylem parenchyma and ray cells remain intimately associated with the [...]
Let us make an in-depth study of the ascent of SAP. After reading this article you will learn about (A) Path of Ascent of Sap (B) Mechanism of Ascent of Sap and Theories of Ascent of Sap. Ascent of SAP: The water after being absorbed by the roots is distributed to all parts of the plant (excess of which is [...]