Algae are classified into three main classes – Chlorophyceae, Phaeophyceae, and Rhodophyceae. Many of them (spirogyra,chlorella) serve as protein and vitamin. The vegetative propagation takes place by cell division and fragmentation. Fritsch (1935) considered to ... Vaucheria, genus of yellow-green algae (family Vaucheriaceae), found nearly worldwide. Chlorophyceae: this group of algae belong to the class of Chlorpohyta. Some green algae are photoheterotrophic, i.e., they utilize organic carbon when their photosynthesis becomes limited by the availability of dissolved inorganic carbon (Graham, et al., 1994; Lewitus and Kana, 1994). Chlorophyceae, Phaeophyceae and Rhodophyceae. Ulvophyceae, Dasycladophyceae, Bryopsidophyceae, and Cladophorophyceae are primarily marine. Introduction to algae Linnaeus in 1753 was first to introduced the term algae … Species of Sphagnum, a moss, provide peat that have long been used as fuel, and because of their capacity to hold water as packing material for trans … 2013 - 2020. Members of conjugales (e.g., Spirogyra, Zygnema etc.) Later Bold and Wynne (1978) also followed the same suggestion. It is a microscopic green algae which produces good amount of hydrocarbons projected as a modern day source of renewable energy compound. Algae have been divided on the basis of nature of pigments present in them and the mode of storing food. How cells divide: (aspects of mitosis and cytokinesis) • open vs. closed mitotic spindle • phycoplast vs. phragmoplast • furrowing vs. cell plate formation in center of cell closed II. Index of Relative Importance showed 80% of the food comprised of microplankton groups viz. Commercial products from algae- many products are derived from algal cell wall for economic value. Cladophora)- called diplohaplontic life cycle. Chlorophyceae (green algae), Phaeophyceae (brown algae) and Rhodophyceae (red algae). (b) Bryophyta – three general characteristics, graphic outline of life cycle of Funaria with reference to alternation of generations.Economic importance of bryophytes. Algae refers to a wide range of eukaryotic marine organisms, all of which engage in the process of photosynthesis. Hydrodictyon), coenocytic (e.g. (xv) Asexual Next. They are used in many areas of the world. Fucales – e.g. Chlorophyceae, Phaeophyceae and Rhodophyceae. 1.Chlorophyceae serve as the chief source of food and oxygen in freshwater and marine animals. closed with non- persistent spindle. Chlorella, Scenedesmus and Anacystis are used in investigations in … write the characteristic features and economic importance of chlorophyceae , phaeophyceae and rhodophyceae Share with your friends. Economic Importance. The smallest unicellular algae is Micromonas pusilla which is 1 μm (0.00004 in.) 7. Economic importance of algae. 2. Classifications. i.Class-Chlorophyceae (Green Algae) ... Economic Importance of Gymnosperms (i) Seeds of Pinus gerardiana (chilgoza) are used a food after roasting. Cellulose terminal complex in linear row. Chlorophyceae ... Economic Importance of Bryophytes: Bryophytes in general are of little economic importance but some mosses provide food for herbaceous mammals, birds and other animals. Fig. ; Starch is a means of stored food. Chlorophyceae (Green algae) General characterstics of Chlorophyceae. Timber Value (4). Let’s figure out the economic importance of algae together! Chlorophyceae (green algae) are not of much economic importance. Fucus, Sargassum, etc. The class Chlorophyceae shows a range of variation in the structure of plant body (thallus). (ii) The structure is various – flagellate unicellular (e.g. Flagella roots four cruciate roots with no Name two exclusively fresh water orders of green algae. examples of Chlorophyceae, Phaeophyceae, Rhodophyceae; Economic importance of algae – any five. or unbranched (e.g., Oedogonium, Spirogyra, Ulothrixetc.). attached at anterior end of cell. Watch Previous Video. Species of Sphagnum, a moss, provide peat that have long been used as fuel, and because of their capacity to hold water as packing material for trans … 3 (c) Pteridophyta: three characteristics; Graphic outline of life cycle of a typical pteridophyte (fern). Photosynthetic pigments: They possesses chlorophyll a, chlorophyll b and small amount of β-carotenoids. Major pigments – Chlorophylls a and b . Change Server . Economic Importance of Red algae. Osicllatoria and few other cyanobacteria are used as pollution indicator. Major pigments – Chlorophylls a and b . Example: Clapdohora, Ulva, Draparnaldiopsis of Chlorophyceae, and Ectocarpus of Phaeophyceae follow this life cycle. © and ™ first-learn.com. Chlorophyceae are primarily freshwater. Phaeophyceae is divided into 9 orders by Fritsch. (viii) Mitosis It was created as open software. It stores food as oil droplets. Chlorophyceae (chloros, green; phyceae, algal organisation) is commonly known as green algae’. These pigments give them specific color. That's why, it is used as food of human. in cell wall, storage of starch, flagella in motile form. It is the largest class of algae; They are commonly known as green Algae. Chlorophyceae (Green algae) The plant body may be unicellular, colonial or filamentous. Economic Importance 4. Minor members of marine temperate intertidal communities. The Chlorophyceae are one of the classes of green algae, distinguished mainly on the basis of ultrastructural morphology.For example, the chlorophycean CW clade, and chlorophycean DO clade, are defined by the arrangement of their flagella.Members of the CW clade have flagella that are displaced in a "clockwise" (CW, 1–7 o'clock) direction e.g. (i) Uses as food – Chlorella produces food rich in proteins, fats, vitamins, minerals. ADVERTISEMENTS: 2. The nucleoli and chromosomes remain suspended in the granular matrix of the nucleus. Source of Oil (5). Some other edible gymnosperms plant part are endosperm of Ginkgo, seed kernel of some Cycas and Gnetum, sago grains from stems of Cycas, etc. They form symbiotic association with protozoa fungi and plants.The nitrogen fixation species form association with angiosperms.They … algae or chlorophycae are ancestors of land plants due to presence of There are approximately 350 genera and 2650 living species of chlorophyceans. The name is used in two very different senses, so care is needed to determine the use by a particular author. Some members may be terrestrial and grow as epiphytes on tree trunk, leaves etc. Tabulate the economic importance of algae. (iv) Cell wall contains cellulose. (Neilson and Lewin, 1974; Tuchman, 1996), thus they exhibit mixotrophy. Economic importance of Cyanobacteria . By C.L. Share 1. 54 min. Ornamental Value 1) Algae as food . There are several species under this genus. Potash is abundant in Macrocystis and Nereocystis. Some forms (Prasinophyceans) are known to feed on particles and therefore exhibit phagotrophy and mixotrophy. Commonly called green algae. to multicellular struc­ture. It is also used in the preparation of an antibiotic, chlorellin; which is used to control bacteria. It may be isogamous, anisogamous or oogamous. There are about 2,650 living species of chlorophyceans. (xi) Glycolate Monostroma is used to prepare the common food ‘aonori’ in Japan. A distinctive set of microtubules lying parallel to the developing cleavage furrow is called phycoplast. 3. 36 min. (xvii) Green Bryophytes- Hepaticopsida. Chlorophyceae, trebouxiophyceae, Ulvophyceae, charophyceae 14 3. or the number may be indefinite, arranged in net-like masses and are non-motile as in Hydrodictyon. Lecture notes Seminar 4 Economic importance of chlorophyceae 17. My Notes . Like other algae, green algae serve as an important food source for herbivorous marine life, such as fish, crustaceans, and gastropods, including sea snails. Example: Clapdohora, Ulva, Draparnaldiopsis of Chlorophyceae, and Ectocarpus of Phaeophyceae follow this life cycle. Common name – Green algae. The other two major classes are Chlorophyceae (green algae) and Rhodophyceae (red algae). Economic importance of chlorophyceae- (i) Uses as food – Chlorella produces food rich in proteins, fats, vitamins, minerals. Characters of Green Algae: Green algae are defined as a group of eukaryotic algae which resemble land plants in having cellulosic cell wall, starch as food reserve and both chlorophyll a as well as chloro­phyll b as photosynthetic pigments. Economic Importance. They help in Reclamation of alkaline soil. (ii) Gymnosperms provide softwood for construction, … breakdown by glycolate dehydrogenase. Classification 6. For this reason plant body is called a thallus. Porphyra is an important genus used as food by the Japanese and Chinese Americans. 1. Thallus Organisation in Algae. Like other algae, green algae serve as an important food source for herbivorous marine life, such as fish, crustaceans, and gastropods, including sea snails. The name green alga is given because of the presence of domi­nant pigments like Chlorophylls a and b over the carotenoids and xanthophylls. Humans use green algae as food, too. Occurrence. Agar is used in solidifying culture media and is added as stabiliser or thickener in the preparation of jellies. Some species are fed to cattle. The cell wall is stable and generally has cellulose as the main structural polysaccharide. In some algae like Ulva, the plant body is leaf-like. The shape of chloroplast shows much variation; it is cup shaped, (Chlamydomonas), girdle shaped (Ulothrix), reticulate (Cladophora, oedogonium), stellate, spiral (Spirogyra) or discoid. Answer: The general character of Bryophytes: Bryophytes are non – vascular cryptogams due to absence of xylem & phloem. 21 min . (b) Heteromorphic or Heterologous Diplo­haplontic Type. This class consists of 425 genera and about 6,500 species but, later Prescott (1969) reported that the number of species may be as many as 20,000; with more being discovered continuously. 4. 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