NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: Revision Terminology Part 13
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- Phloem fibres = Bast fibre β present in second xylem
- Xylem fibres = intraxylary fibres
- Xylem
- (1) Tracheid β dead β most primitive (Bordered pit β gymnosperm, angiosperm, wood vessel of angiosperm) .
(2) Vessels β dead β Conducting units β advanced
(3) Parenchyma β living β short distance transport β Tyloses (outgrowth)
(4) fibres β dead β mechanical support
- Primitive vessel less angiosperm β Winteraceae, Trochodendraceae, Tetra-centraceae.
- Vessels present β pteridophytes β Selaginella (spike mosses) , Equisetum, Actiniopteris , pteridium, Regnellidium, Marsilea
- Vessels present β Gymnosperm β ephedra, gnetum, Welwitschia.
- Phloem lepton = soft walled conducting
- Sieve tube β nucleus absent (1) & (2) = sister cells
- Companion cell β sieve tube dependent (analogous albuminous cells of conifers) .
- Parenchyma β living (absent in monocot)
- Fibres β mechanical support β dead
- Sclereids β in older phloem β mechanical support.
- Slime plugs β Coagulation of slime bodies on sieve plates made of p-protein movement of metrical & sealing of wounds.
- Fibers β Secrete latex
- Latex cell β simple, non β articulated, not fused, Apocyanaece, Ascelepiadaceae, Enphorbiaceae, Moraceae.
- Latex vessel β articulated, Papaveraceae, Caricaceae, Compositaer, Musaceae.
- Latex Heavea Brasiliensis (para rubber) & manihot glaziovi βΎ beleng to Euphorbiaceae
- Indian rubber β ficus elastica
- Latex cell β cannabis, Venea minor, Urticodioica
- Latex of papaya β papain
- Latex of poppy β morphine
- Latex of banana β tannin
- Hydathodes Guttation made of loosely arranged parenchyma cell = epithem
- Intercellular space = Schizogenous cavity β resin duct
- Gland secreting oil = osmophores.
- Epidermis (Angiosperm) can be either Single layered = uniseriate β most angiosperm or Multi layered = multiseriate = Nerium, ficus.
- Epidermis βΎ Waxy cutin βΎ cuticle β reduce water loss & check pathogen
- Cuticle βΎ absent In Hydrophytes, roots, underground parts.
- Root β unicellular hair
- Stem β multicellular hair
- Epidermis in cystolithes = lithocyst
- Epidermis of garlic, Scales & seed of pea & bean = Sclereids
- Epidermis usually colorless but green due to chlorophyll.