Archive For December 31, 2017

Symbiotic Association of Lichen

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Lichens are composite organisms consisting invariably of a fungus and an alga or a cyanobacterium. The two components are permanently associated with each other to form a lichen- body. The relationship is symbiotic. The algal or cyanobacterial component provides photosynthetic as well as products of atmospheric nitrogen fixation, if the partner is a cyanobacterium. The…

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Do you know what is “Viroids”

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Viroids are the smallest infectious pathogens known. They are solely composed of a short strand of circular, single-stranded RNA without protein coat. All known viroids are inhabitants of higher plants, in which most cause diseases, some of which are of slight to catastrophic economic importance.As cogently expressed by Flores et al: Viruses (and viroids) share…

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What is Viruses

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A virus is a small parasite that cannot reproduce by itself. Once it infects a susceptible cell, however, a virus can direct the cell machinery to produce more viruses. Most viruses have either RNA or DNA as their genetic material. The nucleic acid may be single- or double-stranded. The entire infectious virus particle, called a…

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What is Saprophytes

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Saprophytes are living organisms that obtain nutrients from dead organic matter and act as decomposers competing with the heavy rainfall that constantly washes away nutrients on the forests floor. The term saprophyte is usually referred to saprophytic fungi or saprophytic bacteria. Before dwelling in detail what is a saprophyte, it is useful to have a…

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Puccinia

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Puccinia is a genus of fungi. All species in this genus are obligate plant pathogens and are known as rusts.The genus contains about 4000 species.The rust species Puccinia obtegens has shown some promise for controlling Canada thistle, but it must be used in conjunction with other control measures to be effective. Another leaf rust species,…

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Spirogyra

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Spirogyra (common names include water silk, mermaid’s tresses, and blanket weed) is a genus of filamentous chlorophyte green algae of the order Zygnematales, named for the helical or spiral arrangement of the chloroplasts that is diagnostic of the genus. It is commonly found in freshwater areas, and there are more than 400 species of Spirogyra…

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Blue Green Algae is Prokaryotic or Eukaryotic

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Scientists classify biological organisms into different domains. For example, humans, plants, and animals, are sorted into the Eukarya domain. To be classified in this domain, organisms must have cells that contain a nucleus and membrane-bound organelles. Organisms that do not have a centralized nucleus or membrane-bound organelles are known as prokaryotes and are sorted into…

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Eukaryotic Cell vs. Prokaryotic Cell

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Prokaryotes (pro-KAR-ee-ot-es) (from Old Greek pro- before + karyon nut or kernel, referring to the cell nucleus, + suffix -otos, pl. -otes; also spelled “procaryotes”) are organisms without a cell nucleus (= karyon), or any other membrane-bound organelles. Most are unicellular, but some prokaryotes are multicellular. Eukaryotes (IPA: [juːˈkæɹɪɒt]) are organisms whose cells are organized…

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Characteristics of living things

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Biology examines the structure, function, growth, origin, evolution, and distribution of living things. It classifies and describes organisms, their functions, how species come into existence, and the interactions they have with each other and with the natural environment. Four unifying principles form the foundation of modern biology: cell theory, evolution, genetics and homeostasis. Most biological…

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Hats off to IAS Officers Prasanth Nair (Affectionately called “Collector Bro”) for their firm determination to change..

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His innovative ideas — such as Operation Sulaimani, a decentralized participatory project to address hunger in urban areas; Tere Mere Beach Mein, a project to tackle waste management at Kozhikode Beach; and Yo Appooppa, an attempt to improve the quality of life of the elderly — were huge runaway successes, thanks to large and wholehearted…

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Who has been elected the new chairman of the Broadcast Audience Research Council (BARC) India?

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Correct Answer: C [Nakul Chopra] Explanation: Nakul Chopra, currently President of AAAI and Senior Advisor at Publicis Communications, has been elected as the new Chairman of Television ratings agency Broadcast Audience Research Council (BARC) India. He will succeed Sudhanshu Vats, chief executive officer (CEO) at Viacom 18 Media Pvt. Chopra will be the 3rd chairman…

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