Roots Flashcards
Taproot
a type of root system; one main root; smaller lateral roots branch off the taproot; found in dicots and gymnosperms; persistant; or die at later stages; obtain water deep in the soil.
root cap
covers and protects root apical meristem; consists of several layers of parenchyma cells; secretes lubricating substance to reduce friction with the soil; orientates the root;
root hair
raise the absorptive capacity of the root; occurs in the zone of maturation; unicellular epidermal extensions, short lived, continually replaced
stele
a cylinder of vascular tissues inside the endodermis
xylem arm
part of the xylem
pericycle
one to several layers of parenchyma cells
casparian strip
occur in radial and transverse walls of endodermal cells
endodermis
controls the transport of the dissolved minerals
adventitious root
aka fibrous root system
fibrous root
made up of many small roots; short lived; used to obtain water from a large ground area
symplast pathway
pathway for water movement in the cortex; water movement through the interconnected cytoplasma of cortex cells
apoplast pathway
pathway for water movement in the cortex; water movement through the interconnected cell walls and the intercellular spaces of the cortex cells; horizontal movement; blocked at the endodermis by casparian strips
substances moving through the root cortex…
follow both symplastic and apoplastic pathways
the sequence of regions in a growing root beginning immediately behind the root cap is…
cell division, elongation, maturation
root hairs are produced in the …
zone of maturation
