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Illustrated, dictionary of biology
Botany
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With the exception of simple plants such as algae, fungi, mosses and
liverworts
, all plants are
vascular
plants
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Vascular plants
Plants that have a complex system of special
fluid-carrying
tissue called
vascular
tissue
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Vascular tissue
Special tissue
which
runs throughout
a vascular plant
Carries fluids
Helps to
support
the
plant
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In young stems, vascular tissue is usually arranged in
separate
units called
vascular bundles
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In older stems, vascular tissue can form a
continuous cylinder
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Xylem
A tissue which carries
water
and minerals from the
roots
to the rest of the plant
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Xylem in flowering plants
Contains
tracheids
with long,
narrow
cells
Provides
support
between the roots and leaves
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Some plants have only
tracheids
in their
xylem
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Vessels and tracheids
Tubes in the
xylem
whose walls are strengthened by
lignin
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Vessels are
wider
than tracheids
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Cambium
A layer of tissue in vascular plants that produces new
xylem
and
phloem
cells
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Laminar -
Flat
; having the form of a
leaf.
Lamina (
pl. laminae
) - The blade or
expanded
part of an organ.
Vascular tissue
Xylem
Phloem
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Primary tissue
The
first
tissue formed by a new
plant
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Primary xylem
Xylem that is formed
first
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Primary phloem
Phloem
that is
formed first
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In real life, there would be many more
tubes
than are shown here
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The
cambium
separates
xylem
and phloem
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Cross
section of young stem refers to the young part of a stem (
dicotyledon
)
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Epidermis
is covered by
cuticle
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Cortex is present in the
cross
section of a young
stem
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Endodermis
is mentioned in the context of
root
structure
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Longitudinal
section of a root is
referenced
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Vascular bundles are present in the
cross section
of a young stem
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