Term
|
Definition
•radicle (inside the embryo) grows out of the seed and develops into the first root |
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
| primary root that grows vertically downward and from which smaller lateral roots branch |
|
|
Term
| violet is an example of what kind of root? |
|
Definition
|
|
Term
| sow thistle is an example of what type of root? |
|
Definition
|
|
Term
|
Definition
large central root formed directly from the radicle within the seed and a set of much thinner lateral or secondary roots. |
|
|
Term
|
Definition
|
|
Term
• •have taproot systems with one or more primary roots from which secondary roots grow |
|
Definition
|
|
Term
|
Definition
|
|
Term
•have fibrous root systems |
|
Definition
|
|
Term
|
Definition
1.parenchyma cells covering tip of root |
|
|
Term
| two functions of root cap |
|
Definition
1. protect tissues as root pushes through soil 2. ** helps root to grow downward – perception of gravity |
|
|
Term
|
Definition
perception of gravity(possible causes – calcium ions influence growth hormones in cells), causes root to grow downwards |
|
|
Term
|
Definition
| of root cap’s cells secrete slimy substance to act as lubricant to move through soil |
|
|
Term
|
Definition
| center of the root tip and surrounded by root cap |
|
|
Term
root cap produced by cells from this region; composed of apical meristem; cubeshaped, large nuclei, few and small vacuoles |
|
Definition
|
|
Term
| 3 areas of apical meristem |
|
Definition
1. Protoderm 2. Ground meristem 3. Procambium |
|
|
Term
|
Definition
outer layer of cells epidermis |
|
|
Term
|
Definition
inside protoderm; produces parenchyma cells –cortex |
|
|
Term
|
Definition
| center of the root; produces xylem and phloem |
|
|
Term
|
Definition
cells several times original length; no further increase in cell size takes place above this region ** (so only root cap & apical meristem pushes through soil) |
|
|
Term
|
Definition
sometimes called **root-hair zone |
|
|
Term
|
Definition
| are not separate cells but extensions of epidermal cells increase absorption by root |
|
|
Term
|
Definition
|
|
Term
| order of root (in to out) |
|
Definition
| xylem, phloem, pericycle, endodermis, pericycle |
|
|
