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Vascular tissue, Vascular tissue, Plant tissue - Coggle Diagram
Vascular tissue
Phloem
Companion cells
Phloem Parenchyma
only in dicotyledonous plants
Sieve tubes
Fibres
secondary phloem of dicotyledons
Sclereids
Xylem
Tracheids
Ferns & conifers
Xylem fibres
Xylem vessels
Secondary xylem
Secondary thickenings
Primary xylem
Metaxylem
Reticulate vessels
Pitted vessels
Scalariform vessels
Protoxylem
Annular vessels
Spiral vessels
Adapted to functions
Xylem parenchyma
Vascular tissue
xylem
Tracheids
longer but narrower
elongated spindle-shaped single cells with tapering end walls
tapered ends overlap and interlock with each other
increase combined strength
dead cells when matured
pits
allow water to move
dont have large perforated or open ends
water moves through smaller pits
lignified cell walls
Xylem fibres
Characteristics
dead cells
thickened lignified cell walls
Functions
support plant body
not involved in water transport
Xylem vessels
Characteristic
deposition of lignin on walls of tubes
impermeable to water, solutes and gases
dead cells
no protoplasm
more water can flow with less friction
Column of tubular cells
end cross-walls break down
xylem elements combine to form a continuous long tube
Primary xylem
Protoxylem
imcomplete lignification
annular vessels & spiral vessels
elongation & growth of young stems and roots
stretched
behind apical meristem in shoot and root
Metaxylem
more extensive lignification
Reticulate, scalariform, pitted thickenings
bigger lumen
transport more water& mineral ions to old plants
cannot be stretched
high tensile strength
prevent vessels from collapsing
pits
allow lateral movement
Secondary xylem
vascular cambium of dicotyledonous
Adapted to their function
narrow vessels
cell walls are lignified
annular & spiral thickenings
scalariform, reticulate, pitted thickenings
arranged end to end
mature cells are dead cells
Xylem parenchyma
living cells
living cells
packaging tissue in primary tissue
radial medullary rays in secondary xylem
radial transport
Phloem
Plant tissue
Meristematic tissue
Lateral meristem
Intercalary meristem
Apical meristem
Permanent tissue
Ground tissue
Parenchyma
Mesophyll
Aerenchyma
Epidermis
Endodermis
Secretory tisse
Pericycle
Collenchyma
Scelerenchyma
Sclerenchyma fibres
Sclereids
Vascular tissue
Epidermal tissue