Biology GK Questions Quiz-14

Biology GK Questions Quiz-14

Biology Multiple Choice Questions (MCQs) Quiz for State and UPSC Civil Services Examinations. Objective Questions on Biology for competitive examinations.

    261. Which one of the following creatures has maximum number of ribs ?

    (1) Crocodile
    (2) Snake
    (3) Ray fish
    (4) Flying mammal
    Answer:
    261. (2) Snakes have the maximum number of ribs. On an average they have 200 to 400 bones (Vertibrae) and each have a pair of ribs on either side.

    262. Which one of the following is most important for the growth of children up to the age of 14?

    (1) Protein 
    (2) Vitamin
    (3) Fat 
    (4) Milk
    Answer:
    262. (1) Protein is a vital part of a healthy diet for children. This substance, though important for all people, is especially necessary for developing and growing bodies. Protein is used as a source of energy, especially when carbohydrates and fats are at insufficient levels in the diet. In addition, a child
    needs adequate protein to support the body’s production of its own proteins. The manufactured proteins are used in strength maintenance, development of muscles and connective tissues, transportation of oxygen to all areas of the body and antibody production to fight infections.

    263. Study of newly born up to the age of 3 months is called

    (1) Chorology 
    (2) Conchology
    (3) Nematology 
    (4) Neonatology
    Answer:
    263. (4) Neonatology is a subspecialty of pediatrics that consists of the medical care of newborn infants, especially the ill or premature newborn infant. It is a hospital-based specialty, and is usually practiced in neonatal intensive care units (NICUs). The principal patients of neonatologists are newborn infants who are ill or requiring special medical care due to prematurity, low birth weight, intrauterine growth retardation, congenital malformations (birth defects), sepsis, pulmonary hyperplasia or birth asphyxias.

    264. Which one of the following does not secrete any digestive enzyme?

    (1) Liver
    (2) Salivary gland
    (3) Glands of small intestine
    (4) Pancreas
    Answer:
    264. (1) Digestive enzymes are enzymes that break down polymeric macromolecules into their smaller building blocks, in order to facilitate their absorption by the body. Digestive enzymes are found in the digestive tracts of animals (including humans) and in the traps of carnivorous plants, where they aid in the digestion of food, as well as inside cells, especially in their lysosomes, where they function to maintain cellular survival. Digestive enzymes are diverse and are found in the saliva secreted by the salivary glands, in the stomach secreted by cells lining the stomach, in the pancreatic juice secreted by pancreatic exocrine cells, and in the intestinal (small and large) secretions, or as part of the lining of the gastrointestinal tract.

    265. Which one of the following is related to Silviculture ?

    (1) Culture of Hilsa
    (2) Culture of silver carp
    (3) Culture of oil-producing plants
    (4) Forest crops
    Answer:
    265. (4) Silviculture is the practice of controlling the establishment, growth, composition, health, and
    quality of forests to meet diverse needs and values. The name comes from the Latin silvi- (forest) + culture (as in growing). The study of forests and woods is termed silvology. Forest regeneration is the act of renewing tree cover by establishing young trees naturally or artificially, generally promptly after the previous stand or forest has been removed.

    266. The term ‘GM food’ refers to the food

    (1) that grows under genetic measures
    (2) that is genetically modified
    (3) that grows under geographical modification
    (4) with greater glucose metabolism
    Answer:
    266. (2) Genetically, modified foods (GM foods) are foods derived from genetically modified organisms (GMOs), such as genetically modified crops or genetically modified fish. GMOs have had specific changes introduced into their DNA by genetic engineering techniques. These techniques are much more precise than mutagenesis (mutation breeding) where an organism is exposed to radiation or chemicals to create a non-specific but stable change. Other techniques by which humans modify food organisms include selective breeding; plant breeding, and animal breeding, and somaclonal variation.

    267. Which of the following organisms is most likely to produce greenhouse gases such as nitrous oxide and methane?

    (1) Fungi 
    (2) Earthworm
    (3) Bacteria 
    (4) Green plants
    Answer:
    267. (4) When it comes to greenhouse gases many of us think first of CO2. But a large proportion of global greenhouse gas emissions are actually other gases, such as N2O (nitrous oxide) and CH4 (methane). The emission of methane and nitrous oxide is largely the result of agricultural activities; nitrous oxide from fertilisers and methane mostly from cows. In peat pasture areas these emissions are particularly prevalent.

    268. Which of the following is a fish?

    (1) Silverfish 
    (2) Starfish
    (3) Dogfish 
    (4) Cuttlefish
    Answer:
    268. (3) The spiny dogfish shark (Squalus acanthias) is the most common shark and travels in schools. They are called dogfish because they travel and hunt in packs. They also migrate in schools, following cool waters. The spiny dogfish shark is found worldwide in temperate and subarctic waters, in the temperate and subarctic latitudes of the North Atlantic and North Pacific oceans. These sharks have even been found in the Black sea and Mediterranean sea.

    269. The colour of human skin is produced by

    (1) Haemoglobin
    (2) Insulin
    (3) Adrenaline 
    (4) Melanin
    Answer:
    269. (4) Human skin colour is primarily due to the presence of melanin in the skin. Skin colour ranges from almost black to white with a pinkish tinge due to blood vessels underneath. Variation in natural skin colour is mainly due to genetics, although the evolutionary causes are not completely certain. Melanin is produced by cells called melanocytes in a process called melanogenesis. Melanin is triggered by an enzyme called tyrosinase, which creates the color of skin, eyes, and hair shades. Melanin controls the amount of ultraviolet (UV) radiation from the sun that penetrates the skin by
    absorption. While UV radiation can assist in the production of vitamin D, excessive exposure to UV
    can damage health.

    270. Which one of the following is not transmitted via blood transfusion?

    (1) Hepatitis 
    (2) Typhoid
    (3) HIV 
    (4) Malaria
    Answer:
    270. (2) Typhoid fever, also known as typhoid, is a common worldwide bacterial disease, transmitted by the ingestion of food or water contaminated with the feces of an infected person, which contain the bacterium Salmonella typhi, serotype Typhi. The bacteria which causes typhoid fever may be spread through poor hygiene habits and public sanitation conditions, and sometimes also by flying insects feeding on feces. A person may become an asymptomatic carrier of typhoid fever, suffering no symptoms, but capable of infecting others.

    271. Flat footed camels can walk easily in sandy deserts because

    (1) pressure on the sand is decreased by increasing the area of the surface in contact
    (2) pressure on the sand is increased by increasing the area of the surface in contact
    (3) pressure on the sand is decreased by decreasing the area of the surface in contact
    (4) pressure on the sand is increased by decreasing the area of the surface in contact
    Answer:
    271. (1) Camels have broad, flat, leathery pads with two toes on each foot. When the camel places its foot on the ground the pads spread, preventing the foot from sinking into the sand. When walking, the camel moves both feet on one side of its body, then both feet on the other. This gait suggests the rolling motion of a boat, explaining the camel’s ‘ship of the desert’ nickname. The pad supports the animal on loose sand in much the same way that a snowshoe helps a person walk on snow.

    272. Which one of the following is not a plant product?

    (1) Caffeine 
    (2) Piperine
    (3) Nicotine 
    (4) Saccharin
    Answer:
    272. (4) Saccharin is an artificial sweetener. The basic substance, benzoic sulfilimine, has effectively no food energy and is much sweeter than sucrose, but has a bitter or metallic aftertaste, especially at high
    concentrations. It is used to sweeten products such as drinks, candies, cookies, medicines, and toothpaste. Saccharin derives its name from the word saccharine, meaning of, relating to, or resembling
    that of sugar.

    273. Which is the anti-coagulant substance in blood?

    (1) Fibrinogen 
    (2) Heparin
    (3) Thrombin 
    (4) Globin
    Answer:
    273. (2) Heparin, a highly sulfated glycosaminoglycan, is widely used as an injectable anticoagulant, and has the highest negative charge density of any known biological molecule. It can also be used to form an inner anticoagulant surface on various experimental and medical devices such as test tubes and renal dialysis machines. Although it is used principally in medicine for anticoagulation, its true physiological role in the body remains unclear, because blood anticoagulation is achieved mostly by heparan sulfate proteoglycans derived from endothelial cells.

    274. In which of the following groups, animals bear no teeth?

    (1) Peacock, Ostrich, Tortoise
    (2) Owl, Loris, Crow
    (3) Alligator, Turtle, Tortoise
    (4) Turtle, Kiwi, Cow
    Answer:
    274. (1) The sloth, which is not a bear, has no front teeth. Other mammals are the armadillo and anteater (Order Xenarthra) and baleen whales. Among reptiles the turtles and tortoise. Among amphibians most toads are toothless. Modern birds have a toothless beak or bill. Peacock do not have teeth. Within the fish, all the Cyprinids, some catfish, paddelfish.

    275. Jaundice is a symptom of disease of

    (1) Kidney 
    (2) Liver
    (3) Pancreas 
    (4) Thyroid
    Answer:
    275. (2) Jaundice is a yellowish pigmentation of the skin, the conjunctival membranes over the sclerae (whites of the eyes), and other mucous membranes caused by hyperbilirubinemia (increased levels of bilirubin in the blood). This hyperbilirubinemia subsequently causes increased levels of bilirubin in the extracellular fluid. Concentration of bilirubin in blood plasma does not normally exceed 1 mg/dL (>17µmol/L). A concentration higher than 1.8 mg/dL (>30µmol/L) leads to jaundice. Jaundice is often seen in liver disease such as hepatitis or liver cancer. It may also indicate leptospirosis or obstruction of the biliary tract, for example by gallstones or pancreatic cancer, or less commonly be congenital in origin.

    276. The vaccination against small pox involves the introduction of

    (1) killed germs
    (2) weakened germs
    (3) live antibodies
    (4) activated germs
    Answer:
    276. (2) The smallpox vaccine was the first successful vaccine to be developed. The process of vaccination was first publicised by Edward Jenner in 1796, who acted upon his observation that milkmaids who caught the cowpox virus did not catch smallpox. The vaccine consists of the virus which causes the related, yet far milder, cowpox disease; this virus is named vaccinia (the term vaccine is derived from it), from the Latin vacca which means cow. This vaccine has functional viruses in it. Vaccines generally consist of a weakened (attenuated) or killed antigens, associated with a particular disease that are capable of stimulating the body to make specific antibodies to that disease. Vaccines use a variety of different substances ranging from dead microorganisms to genetically engineered antigens to defend the body against potentially harmful microorganisms. Effective vaccines change the immune system by promoting the development of antibodies that can quickly and effectively attack a disease causing microorganism when it enters the body, preventing disease development.

    277. Deficiency of Vitamin B6 in man causes

    (1) rickets 
    (2) scurvy
    (3) beri-beri 
    (4) anaemia
    Answer:
    277. (4) Vitamin B6 is a member of the B complex family of vitamins. Known as pyridoxine, its deficiency may lead to microcytic anemia (because pyridoxyl phosphate is the cofactor for heme synthesis), depression, dermatitis, high blood pressure (hypertension), water retention, and elevated levels of homocysteine. Vitamin B6 is found in a wide range of foods, including meat, poultry, legumes, bananas and foods that are fortified with a supplemental form. Adults need 1.3 to 1.7 milligrams (mg) daily to meet their requirements.

    278. First successful heart transplantation was done by

    (1) D.S. Paintal
    (2) C.N. Barnard
    (3) D. Shetty
    (4) P. K. Sen
    Answer:
    278. (2) Christiaan Neethling Barnard was a South African cardiac surgeon who performed the world’s first successful human-to-human heart transplant. He performed the world’s first human heart transplant
    operation on 3 December 1967, in an operation assisted by his brother, Marius Barnard; the operation
    lasted nine hours and used a team of thirty people. The patient, Louis Washkansky, was a 54-year-old
    grocer, suffering from diabetes and incurable heart disease.

    279. Yellow Fever is transmitted by

    (1) Aedes 
    (2) Anopheles
    (3) House-fly 
    (4) Culex
    Answer:
    279. (1) Yellow fever (also known as Yellow Jack and Bronze John) is an acute viral hemorrhagic disease. The virus is a 40 to 50 nm enveloped RNA virus with positive sense of the Flaviviridae family. The yellow fever virus is transmitted by the bite of female mosquitoes (the yellow fever mosquito, Aedes aegypti, and other species) and is found in tropical and subtropical areas in South America and Africa, but not in Asia. The only known hosts of the virus are primates and several species of mosquito.

    280. Washing of peeled vegetables removes the vitamin

    (1) A 
    (2) C
    (3) D 
    (4) E
    Answer:
    280. (2) B-complex vitamins and vitamin C are watersoluble vitamins that are not stored in the body and must be replaced each day. These vitamins are easily destroyed or washed out during food storage and preparation. Fat-soluble vitamins — vitamins A, D, E and K — dissolve in fat before they are absorbed in the blood stream to carry out their functions. Excesses of these vitamins are stored in the liver.

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