DICOTYLEDONOUS ROOT
● We will take the `color{violet}("transverse section")` of the `color{violet}("sunflower root")` as an example.
● The `color{violet}("internal tissue organisation")` is as follows:
● The outermost layer is `color{brown}("epidermis.")`
● Many of the `color{violet}("epidermal cells")` protrude in the form of `color{violet}("unicellular ") ` root hairs.
● The `color{brown}("cortex")` consists of several layers of thin-walled `color{violet}("parenchyma cells")` with intercellular spaces.
● The `color{violet}("innermost layer")` of the `color{violet}("cortex")` is called `color{brown}("endodermis.")`
● It comprises a `color{violet}("single layer")` of `color{violet}("barrel-shaped cells")` without any intercellular spaces.
● The `color{violet}("tangential")` as well as `color{violet}("radial walls")` of the `color{violet}("endodermal cells")` have a deposition of water impermeable, `color{violet}("waxy material")` `color{brown}("-suberin")` -in the form of `color{brown}("casparian strips.")`
● Next to `color{violet}("endodermis lies")` a few layers of thick-walled `color{violet}("parenchyomatous")` cells referred to as pericycle.
● `color{violet}("Initiation of lateral roots")` and `color{violet}("vascular cambium")` during the `color{violet}"secondary growth"` takes place in these cells.
● The pith is `color{violet}"small or inconspicuous."`
● The `color{violet}"parenchymatous cells"` which lie between the `color{violet}"xylem"` and the `color{violet}"phloem"` are called `color{brown}("conjuctive tissue.")`
● There are usually two to four `color{violet}("xylem and phloem")` patches.
● Later,a `color{violet}("cambium ring")` develops between the `color{iolet}("xylem")` and `color{violet}("phloem.")`
● All tissues on the inner side of the `color{violet}("endodermis")` such as `color{violet}("pericycle,")` vascular bundles and pith constitute the `color{brown}("stele.")`
● The `color{violet}("internal tissue organisation")` is as follows:
● The outermost layer is `color{brown}("epidermis.")`
● Many of the `color{violet}("epidermal cells")` protrude in the form of `color{violet}("unicellular ") ` root hairs.
● The `color{brown}("cortex")` consists of several layers of thin-walled `color{violet}("parenchyma cells")` with intercellular spaces.
● The `color{violet}("innermost layer")` of the `color{violet}("cortex")` is called `color{brown}("endodermis.")`
● It comprises a `color{violet}("single layer")` of `color{violet}("barrel-shaped cells")` without any intercellular spaces.
● The `color{violet}("tangential")` as well as `color{violet}("radial walls")` of the `color{violet}("endodermal cells")` have a deposition of water impermeable, `color{violet}("waxy material")` `color{brown}("-suberin")` -in the form of `color{brown}("casparian strips.")`
● Next to `color{violet}("endodermis lies")` a few layers of thick-walled `color{violet}("parenchyomatous")` cells referred to as pericycle.
● `color{violet}("Initiation of lateral roots")` and `color{violet}("vascular cambium")` during the `color{violet}"secondary growth"` takes place in these cells.
● The pith is `color{violet}"small or inconspicuous."`
● The `color{violet}"parenchymatous cells"` which lie between the `color{violet}"xylem"` and the `color{violet}"phloem"` are called `color{brown}("conjuctive tissue.")`
● There are usually two to four `color{violet}("xylem and phloem")` patches.
● Later,a `color{violet}("cambium ring")` develops between the `color{iolet}("xylem")` and `color{violet}("phloem.")`
● All tissues on the inner side of the `color{violet}("endodermis")` such as `color{violet}("pericycle,")` vascular bundles and pith constitute the `color{brown}("stele.")`
