Lesson 2 Flashcards
Are important part of underground part of all vascular plants.
Root
This is responsible for anchoring it down into the ground and absorbing the essential mineral elements, nutrients, and water from the soil.
Root
The main function Is of the root are Anchorage and absorption. However, it can also function in the storage and asexual reproduction, among others.
Morphology
3 types Major types of roots system in plants
1) Taproot System
2) Fibrous Root System
3) Adventitious Root System
originates from the seed radicle and consists of one main root, generally growing straightforward, with smaller lateral or branch roots. It originates from the seed radicle.
Taproot System
consist of numerous fine roots similar in diameter. It is also originates from the seed radicle.
Fibrous Root System
the roots that grow from any part of the plant other than the radicle. they may develop from the base of stems, nodes, internodes, and, in some cases, from leaves.
Adventitious Root System
the first root that emerges from a germinating seed.
Primary Root
roots arising from the primary root
Secondary Root
root arising from secondary root.
Tertiary Root
roots arising from parts other than the radicle. They may arise from leaves, nodes, stems, and internodes.
Adventitious root
roots arising from parts other than the radicle. They may arise from leaves, nodes, stems, and internodes.
Adventitious root
the outermost layer of cells, which is only one cell thick.
Epidermal Region
consists of many layers of thin-walled parenchyma cells with intercellular spaces.
Cortex Region
the innermost later of the cortex, consisting of a single layer of barrel-shaped cells that are closely packed and have no intercellular spaces.
Endodermis
occupies the central portion of the root and consist of the pericycle and vascular tissues.
Stele or Vascular Cyclinder
has structure similar to that of a young dicot root.
Pericycle
polyarched and has a center occupied y parenchyma and not by trachea ry elements.
Xylem
occupies the spaces between the radial arms of the xylem.
Phloem
composed of parenchymatous cells found ai the center.
Pith
the growing apex of the root. It is covered and protected at the tip by loosely arranged parenchymatous cells that form what is called root сар.
THE REGION OF CELL DIVISION
(MERISTEMATIC REGION)
found above the meristematic region. The cells here elongate several times their original length & push root tip through the soil.
THE REGION OF ELONGATION
lies above the region of elongation and extends upward. The cells here are elongated. This region is responsible for the increase in length of the root into various distinctive cell types.
THE REGION OF MATURATION
big roots that look like they arise from the base of the tree trunk
Buttress roots
aerial roots arising from branches.
Prop or stilt roots
aerial root arising from the main stem that penetrates the ground.
Brace roots
aerial roots that cling to some kind of support.
Clinging roots
