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CH.7 ROOTS (Other Root Types (Prop roots (palms (roots grow through air…
CH.7 ROOTS
Other Root Types
Aerial roots of orchids
contractile roots
Prop roots
palms
roots grow through air
provide nutrients + support after contacting soil
Mycorrihzae
relationship between soil fungi + roots
Storage roots
root nodules
nitrogen fixation
chemical conversion of atmosphere Nitrogen into usable compounds
haustoria roots of parasitic flowering plants
roots of parasitic plants
roots of Strangler Figs
birds eat fig fruit
plant seeds of fruit on other trees
Strangler Fig Roots grow on other trees
Internal Structure
Root Cap
protects apical meristem
meristematic cells
Root Apical Meristem
Zone of Elongation
right behind root cap/apical meristem
where cells undergo expansion + division
cells begin to differentiate
Zone of Maturation/Root Hair Zone
behind zone of elongation
where epidermal cells extend out as narrow trichomes
root hairs form + grow out
Taproots
Beets
Carrots
Raddishes
store carbs
grow horizontally
Functions
Absorbing water + minerals
producing hormones
Anchoring plant to substrate
Root System Organization
1 large taproot
multiple branching or lateral roots
develops from radicle
embryonic root
Monocots
fibrous root system
mass of many similar sized roots
adventitious roots
Structure of Individual Roots
root tip
growth occurs here
localized growth
protected by root cap
secrete mucigel
helps root slide through soil
External Structure
Lateral Roots
