There are two tissues in the root which act as a filter. The cells called Casparian strip and the Phloem sieve tube both play a role in protecting the plant from absorbing harmful substances. However, their roles differ from each other. Whereas Casparian strip prevents water from passing through its wall, Phloem sieve tube allows passage of water through it while preventing other substances like minerals to pass through it.
There are two tissues which act as a filter on the water absorbed by the root hairs of plants – cells called Casparian strip and phloem sieve tube.
The cells called Casparian strip are part of the endodermis, a layer of tissue in root consisting of living and dead cells. This layer is made up of tangentially elongated cells and it prevents the water from passing through it. The purpose for this is to prevent contaminants that are dissolved in water (when absorbed by the root) from passing through the wall of root in case of excess absorption.
On the other hand, phloem sieve tube consists of tangentially elongated sieve-tube members which are joined end to end. This structure is designed in such a way that only water passes through its walls while other substances like minerals do not pass through them.
The Endodermis consists of a group of narrow cells that prevent the water from passing through the roots. The roots absorb water and carry it in through the xylem to other parts of the plant. However water and other things brought into the plant must be filtered because there can be harmful things in them. The endodermis acts as a filter to keep out these substances.
The Endodermis, which is the outer layer of cells in the roots. It surrounds it and acts as a filter. It prevents harmful substances like salts from entering the plant. The root absorbs water and carries it to other parts of the plant so that it can be used to make more plants. However, there is a need for this water to be filtered so that harmful substances don’t get in. To meet this need, there are special cells called endodermal cells which act as a filter.
The phloem sieve tube is another type of cell which is found in roots to prevent harmful substances from being absorbed or passed through into the plant cells. The phloem tube is made up of endodermal cells which are arranged into tubes. The endodermal cells are special cells which are only found in roots and xylem tissues. Each sieve tube is joined end to end with other neighbouring sieve tubes. Inside the sieve tube, a water-like solution called phloem sap travels between the cells.
The Phloem Sieve Tube are special root cells that act as filters to keep out harmful substances from entering the plant by any of its roots or stems. The Phloem Sieve Tubes travel up and down the stems and roots of plants carrying food for all parts of a plant except the leaves. It is made of endodermis cells which are arranged into tubes. The endodermal cells are special cells that are only found in roots and xylem tissues.
There are two types of Casparian strips (hereafter referred to as “a Casparian strip”). One is the “Tracheary Elements” which can be found in the xylem tissue, that is, the tissue that transports water from the roots to all parts of the plant. Water passes through these tracheary elements from one cell to another by means of sieve-plates.
