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in Stem - External Morphology by (46.2k points)
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Differentiate between stem and root?

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Stem Root
mostly epidermis is covered by distinct cuticle.  Epiblema lacks cuticle.
Stem hairs are either unicellular or multi cellular they are separated from epider­mal cells by walls. Root hairs are unice­llular.
Stomata may occur in epidermis. They are not separated from cells of epiblema by w alls.
cortex is generally differentiated into zones like hypodermis, general cortex and endodermis. Stomata are absent.
Hypodermis is either collenchvmatous or selerenchymatous. Cortex is an undifferentiated mass.
Endodermis lacks casparian strips; cells of endo­dermis contain starch grains. Hypodermis is absent
Pericycle is not present in all stems. Thick walled exoder­mises is present in some roots in its place
Lateral branches are superficial. Endodermis is distinct with casparian strips, pericycle is present.
They do not develop from pericycle. Lateral roots arise from pericycle.
Vascular bundles are conjoint, collateral or concentric. Vascular bundles are radial in arrangement.
 Xylem is endarch.  Xylem is exarch.

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