Archive For The “Science” Category

SSC CGL Mock Test 6 (English)

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SSC CGL Mock Test 5 (English)

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Pure white light from Zinc [Current Affairs for IAS Exams – 11 February 2018]

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Now, pure white light can be produced using zinc, which is usually used to protect iron from rusting and in making brass. The most commonly used method of producing white light is by mixing three primary colour–emitting phosphors in a proportionate composition. The existing methods of white-light production are energy-intensive and involve a long process….

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Reasons for same-sex behavior in Pigeons [Current Affairs for IAS Exams – 11 February 2018]

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It’s all about making the best of a bad job: if there is a paucity of males, female rock pigeons can form long-lasting, same-sex relationships to bring up their chicks, find scientists. Such female pairs fare no differently than female–male pairs, and better than single females, in bringing up their brood. Numerous records of same-sex…

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Immigration in Biology [Current Affairs for IAS Exams – 11 February 2018]

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Potential Biomarker for Alzheimer’s disease [Current Affairs for IAS Exams – 11 February 2018]

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Researchers at Bengaluru’s Indian Institute of Science (IISc) have identified a potential biomarker for Alzheimer’s disease. The biomarker shows up very early in the disease process and well before clinical and even pathological manifestation of the disease. They also found that it is possible to reverse the disease process if identified early. Loss of dendritic…

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Stilt roots are found in……

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1. Stilt roots develop from the basal nodes of the main stem. 2. They are comparatively short. 3. The roots develop obliquely at an angle to the stem. 4. Stilt roots provide support like ropes of a tent or pole. 5. Young stilt roots are non-hygroscopic. 6. Stilt roots are comparatively little thick or massive….

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Which is largest group of animals?

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The answer could be arthropoda: it is the most successful group of animals. Within phylum ARTHROPODA, largest class is INSECTA (=hexapoda). The answer to the above question: D

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Read all about “Mammals”

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Mammals are any vertebrates within the class Mammalia , a clade of endothermic amniotes distinguished from reptiles (including birds) by the possession of a neocortex (a region of the brain), hair, three middle ear bones, and mammary glands. Females of all mammal species nurse their young with milk, secreted from the mammary glands. Mammals include…

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Match the following table

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Chlamydomonas is a genus of green algae consisting of unicellular flagellates, found in stagnant water and on damp soil, in freshwater, seawater, and even in snow as “snow algae”. Cycas is the type genus (Gymnosperm) and the only genus recognised in the family Cycadaceae. About 113 species are accepted. Cycas circinalis, a species endemic to…

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Classification of Algae

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The answer to the above question : B Algae are basically classified with the pigments like Green algae , blue algae etc.  

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Do you know what is “Angiosperms”

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The flowering plants, also known as angiosperms, Angiospermae or Magnoliophyta, are the most diverse group of land plants, with 416 families, approximately 13,164 known genera and c. 295,383 known species.Like gymnosperms, angiosperms are seed-producing plants. However, they are distinguished from gymnosperms by characteristics including flowers, endosperm within the seeds, and the production of fruits that…

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Coralloid Roots

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All known Cycads form mutualistic, facultative symbioses with nitrogen fixing cyanobacteria (formerly known as the blue-green algae). Cycads provide fixed carbon and a stable environment to the cyanobacteria in exchange for fixed nitrogen. These cyanobacteria are endosymbionts, living within the roots of Cycads. Symbiosis is “the living together of differently named organisms”. There are many…

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Read all about Bryophytes

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Bryophytes are an informal group consisting of three divisions of non-vascular land plants (embryophytes), the liverworts, hornworts and mosses.They are characteristically limited in size and prefer moist habitats although they can survive in drier environments.The bryophytes consist of about 20,000 plant species.Bryophytes produce enclosed reproductive structures (gametangia and sporangia), but they do not produce flowers…

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Porphyra, Laminaria and Sargassum are the species of?

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Porphyra is a coldwater seaweed that grows in cold, shallow seawater. More specifically, it belongs to red algae phylum of laver species, comprising approximately 70 species.It grows in the intertidal zone, typically between the upper intertidal zone and the splash zone in cold waters of temperate oceans. In East Asia, it is used to produce…

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Do you know about Cuscuta ?

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Cuscuta (dodder) is a genus of about 100–170 species of yellow, orange, or red (rarely green) parasitic plants. Formerly treated as the only genus in the family Cuscutaceae, it now is accepted as belonging in the morning glory family, Convolvulaceae, on the basis of the work of the Angiosperm Phylogeny Group.The genus is found throughout…

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The smallest living organisms known are?

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Mycoplasma is a genus of bacteria that lack a cell wall around their cell membrane.Without a cell wall, they are unaffected by many common antibiotics such as penicillin or other beta-lactam antibiotics that target cell wall synthesis. They can be parasitic or saprotrophic. Several species are pathogenic in humans, including M. pneumoniae, which is an…

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Read all about Bacteria

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Bacteria common noun bacteria, singular bacterium) constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a number of shapes, ranging from spheres to rods and spirals. Bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water,…

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Read all about Fungi

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A fungus (plural: fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, Fungi, which is separate from the other eukaryotic life kingdoms of plants and animals. A characteristic that places…

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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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