VIDEO ON COMLEX TISSUE —XYLEM
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COMPLEX TISSUE 24JULY2024
XYLEM PARENCHYMA: They are the only living parenchymatous cells in xylem .Their main function is to help in conduction and store food material.They are of two types:
(a)Wood parenchyma that formed from fusiform cambial initials.
(b) Ray parenchyma formed from ray initials of the cambium.
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PARTS OF TYPICAL ROOTS
QUISCENT CENTER: The region of inactive cells so they have light cytoplasm and small nuclei they replace the cells of root cap.
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LEAF
PHYLLOTAXY: Mode of arrangement of the leaves on its stam and its braches is called phyllotaxy.
VENATION: Pattern of the veins and veinlets in the lamina of leaf is called venation.
RETICULATE VENATION: Veins are irregularly distributed to form a network. Unicostate : When it has only one main midrib. Multicostate: When several main veins are of same thickness.
PARALLEL VENATION : Veins runs parallel to each other do not form network. It is also two types unicostate and multicostate.
CONVERGENT VENATIONS: Main veins runs parallel and converge at the apex
DIVERGENT VENATION: All the main veins spread out towards the margin.
MODIFICATIONS OF LEAVES
.Phyllodes: In this type of modification the main leaf reduced and the petiole or rachis modified into green coloured leaf like structure to perform photosynthesis.Phyllodes are the modification of xerophytic leaves to reduce transpiration.Ex. Australian Acacia
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BRACTS AND BRACTEOLES
SPATHE: Large brightly coloured and cover spadix inflorescence.
INVOLUCRE: A large number of bracts form compact one or more whorls around a flower or an inflorescence.
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