Xylem & transpiration | Life processes | Biology | Khan Academy

Let's learn how transpiration helps water transport in xylem
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Created by Mahesh Shenoy

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Active Absorption In the case of active absorption, water moves through symplast and it is absorbed according to the Diffusion Pressure Deficit changes. The rate of absorption is slow. It comprises osmotic and non-osmotic forces. Humidity and temperature can have an impact. The force required for the absorption of water is mainly generated in the root cells itself. There would be a decrease in the rate of water absorption if the metabolic inhibitors are applied. Passive Absorption The rate of absorption is fast. It occurs in rapidly transpiring plants. The movement of plants is through apoplast and it is absorbed due to transpiration pull and it is created due to the stress created in xylem sap. The rate of absorption significantly depends upon the rate of transpiration. The force required for the absorption of water is mainly generated in the mesophyll cells. Xylem Xylem is a long, non-living tube running from the roots to the leaves through the stem. The water is absorbed by the root hair and undergoes cell to cell movement by osmosis until it reaches the xylem. This water is then transported through the xylem vessels to the leaves and is evaporated by the process of transpiration. The xylem is also composed of elongated cells like the phloem. However, xylem is especially accountable for transporting water to all plant parts from the roots. Since they serve such an important function, a single tree would have a lot of xylem tissues.

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