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Tissues and primary growth of stems - Coggle Diagram
Tissues and primary growth of stems
basic types
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Parenchyma
thin primary walls, typically alive at maturity,
Collenchyma
unevenly thickened primary walls
typically alive at maturity
provide plastic support
Sclerenchyma
primary walls plus secondary walls
many dead at maturity
provide elastic support and in water transport
External Organization
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stem and shoot
nodes: internodes
leaf axil, axillary bud, bud scales, terminal bud
Internal Organization: Arrangement
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Epidermis
Cortex
vascular tissue
Xylem
Phloem
vascular bundles
Stem growth and differentiation
apical meristems
subapical meristem
protoxylem
metaxylem
protoderm
Types of plant body
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Primary
derived from shoot and root apical meristems
composed of primary tissues
constitutes herbaceous parts
an herb
secondary
derived from meristems other than apical meristems
composed of wood and bark
constitutes the woody, bark-covered parts
Types of Sclerenchyma
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Mechanical
sclereids
more and less isodiametric
often dead at maturity
Fibers
long: many types are dead
others alive: involved in storage
conducting
Tracheids
long and narrow with tapered ends
contains no perforations
dead at maturity
found in all vascular plants
vessel elements
short and wide
one or two perforations
dead at maturity
found at almost exclusively in flowering plants
