Plant body with air bladders, recepta­cles – lie on terminal parts of the thalli, sexual reproduction, oogamous, ooganium with a few eggs. Thallus, brownish in colour, much branched, macroscopic thalloid cells uninucleate, chloroplast devoid of pyrenoids. Sporangial clusters or sori are more or less hemispherical to oblong in shape and consist of 15-25 or more microsporangia. Sexual reproduction is isogamous and occurs by conjugation between two gametes lying in two opposing filaments by means of a conjugation tube. Euglena 15. What is the world’s most endangered animal? The plant body is slender and flexuous, with individual plants attaining lengths up to 30 cm. The oogonium is large, round or oval and contains a single large egg. Other features of nucule and globule art- similar to those of Chora (Fig 2.29). In T.S. The branches have short, phyllode-like or leaf-like structures called ‘leaves’ which may or may not have midrib. The fan-shaped upright position of the thallus is dichotomously branched. Here is a list of thirty-seven thallophytes:- 1. Filaments of older region multi-axial – 2 to many rows of cells in each trichome, heterocyst roundish, intercalary or lateral in position; hormogonium formed at the tip of young branches. Asexual reproduction occurs by zoospores which are developed singly in zoosporangia. The younger parts of the filament are uniseriate with discoid cells and the mature parts are with an axial row of cells which become greatly enlarged being barrel-shaped and surrounded by one or more layers of cortical cells. The antheridia are biscuit-shaped with two antherozoids in each. Cells fusiform with posterior pointed end, presence of a prominent anterior gullet. Thallus unicellular, cell wall highly silicified and composed of two overlapping halves, cells contain distinct chromatophores and oil droplets as stored food. Share Your PPT File. Plant body heterotrichous, uniaxial in the growing and multi-axial in the mature region; carposporangia deve­loping on filamentous gonimoblasts derived directly from the fertilised carpogonium. records how a captain of a brig employed his crew for two bitterly cold days in collecting Lessonia stems which had been washed up on the beach, thinking bhey were trunks of trees fit for burning. Cell contains two halves or semi-cells connected by isthmus zone. Thallus green, chloroplast possesses pyrenoid (i.e. They are always borne at the nodes with a definite orientation, the nucule lying above the globule. Presence of highly, developed heterotrichous plant body, differentiated into 4 zones, viz. Each forms a single androspore (not visible usually). Sheaths of individual trichomes are thin, mucilaginous and diffluent. https://nl.wikipedia.org/w/index.php?title=Thallophyta&oldid=53421393, Wikipedia:Lokale afbeelding gelijk aan Wikidata, Creative Commons Naamsvermelding/Gelijk delen. It is formed on secondary filament at intercalary position. Species may be homothallic or heterothallic. Cells are of a very characteristic type, i.e., each cell has two halves or semi-cells joined by a constriction zone called sinus and a narrow connecting zone called isthmus. Source for information on Thallophyta: A Dictionary of Biology dictionary. The lateral branches bear the reproductive organs, the globule and nucule. Akinetes are spherical or oblong and much larger than vegetative cells with dense protoplasm. Plant body coenocytic, branched, filamentous and differentiated into rhizoidal, stoloniferous and erect portions. The plant is hemispherical, cushion-shaped and composed of prostrate threads with branches distinct from one another exhibiting apical growth. [CH. Filaments long, tubular, sparingly branched, antheridia hook-like curved, oogonia sessile or short-stalked with a beak. They are conventionally called as “lower plants” or “relatively small plants” or “thalloid plants”. The cells have prominent cell to cell cytoplasmic connections and each cell has one nucleus and many discoid plastids embedded in dense cytoplasm. Thallus is colonial. Plant is mucilaginous. It is somewhat globose in structure and composed of several gonimoblast filaments surrounded by enveloping threads. The globule is rounded, but nucule is somewhat short and oval with a roundish crown of ten cells in two tires and is relatively short. The lowest node develops some multicellular rhizoids. The cell contains the following parts (characteristics not visible under ordinary microscope have also been included). Thallus blue-green in colour, cells devoid of conspicuous nucleus, absence of any sex organ, presence of gelatinous sheath around the cells, (in most cases) absence of organised cell organelles like plastids. Filaments loosely entangled, lateral branches clearly seen, cells of main filament short, barrel-shaped, cylindrical; heterocyst’s intercalary and cylindrical. Plant body characterised by unicellular multinucleate vesicular lobed aerial portion and a colourless rhizoidal portion. The plant body is un-branched filamentous and not differentiated into base and apex. They are uniseriatc, septate, fila­mentous. It is formed by the dissolution of the intercalary cells of the trichome and is a few cells in length. Zygnema and a few others. The cell is surrounded by a cell wall which is differentiated into firmer and mucilaginous portions. Plant body is branched, filamentous. Each cell has two halves, both halves are alike, but the outer one (epitheca) is slightly larger than the inner one (hypotheca) and elliptical to lanceolate in shape. Name the group of plants that belongs to the division Thallophyta. Plants are unicellular, fusiform to acicular in shape with posterior pointed end. Thallus green, chloroplast always possesses pyrenoid (i.e., starch protein aggregation). class 11th chapter 3, Thallophyta , plant kingdom,class 11th chapter 3, plant kingdom, Thallophyta, algae types, structures, photosynthetic pigments, algae reproduction It is developed in clusters at the ends of the projecting branches. Asexual reproduction is by swarmers developed from the cells of prostrate system. Mature portion of the thallus multi-axial and pseudoparenchymatous. (With Methods)| Industrial Microbiology, How is Cheese Made Step by Step: Principles, Production and Process, Enzyme Production and Purification: Extraction & Separation Methods | Industrial Microbiology, Fermentation of Olives: Process, Control, Problems, Abnormalities and Developments, The best answers are voted up and rise to the top. It is an elongated and thick-walled body. Plants branched, uniseriate, filamentous, cells having dissected plate like chloroplasts with pyrenoids. Thallus appears to be orange red in colour. Within each cell two laminate chromatophores with pyrenoids are conspicuous. Cells of the finer branches of the thallus produce numerous, small, pear-shaped zoospores. thallophyte. The filaments often show false branching which originate laterally. The apical cell of the filament is covered often by pectosse cap. Deze planten-in-de brede-betekenis-van-het-woord werden dan verdeeld in de Thallophyta enerzijds en de Cormophyta anderzijds. (d) A secondary projecting system being composed of a lull of slightly elongated branches with longer cells. A large pyrenoid embedded in the lower part of the chloroplast. The plant body has the appearance of a miniature horsetail. No longer in scientific use. ... Name the pigment responsible for photosynthesis in plants. Thallus brownish in colour, much branched, filamentous; branchlets attenuated, cells with single nucleus and chloroplasts devoid of pyrenoids. Sexual reproduction is isogamous, the gametes being formed from the cells of prostrate system.
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