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Chapter 7 (External structure of roots ((taproots= main root (forms…
Chapter 7
External structure of roots
highly branched
taproots= main root
forms radicle
lateral root = small and numerous
FIBROUS roots = monocots and eudicots
adventitious roots
Structure of individual roots
no leaves or scars
Root cap
layer of cells
mucigel
lubricates passage for root
root hairs
function for several days then die
Zone of elongation
#
division and expansion
lateral roots
#
started by cell division
break endodermis
most common
prop roots
transport nutrients and water
stabilizes
buttress roots
upperside grows quicker
wind resistant
root apical meristem
originate in meristem
quiescent center
mature portions
passage cells
absorption of minerals
slow to develop
root pressure
#
absorption of water
water pressure
root hair zone
maturation zone
grow outward
transfer minerals
apoplastic transport
endodermis
casparian strips
control minerals
storage roots
carbohydrate storage
