Biology GK Questions Quiz-13

Biology GK Questions Quiz-13

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

    241. The medical term used for the sleeplessness is

    (1) Somnambulism
    (2) Insomnia
    (3) Hallucination
    (4) Nyctinuria
    Answer:
    241. (2) Insomnia, or sleeplessness, is a sleep disorder in which there is an inability to fall asleep or to stay asleep as long as desired. It is most often thought of as both a sign and a symptom that can accompany several sleep, medical, and psychiatric disorders characterized by a persistent difficulty falling asleep and/or staying asleep or sleep of poor quality. Insomnia is typically followed by functional impairment while awake. Insomnia can occur at any age, but it is particularly common in the elderly.

    242. The causative agent of Tuberculosis is

    (1) Mycobacterium
    (2) Aspergillus
    (3) Rhabdovirus
    (4) HIV
    Answer:
    242. (1) Mycobacterium is a genus of Actinobacteria, given its own family, the Mycobacteriaceae. The genus includes pathogens known to cause serious diseases in mammals, including tuberculosis and leprosy. Mycobacterial infections are notoriously difficult to treat. The organisms are hardy due to their cell wall, which is neither truly Gram negative nor positive. In addition, they are naturally resistant to a number of antibiotics that disrupt cell-wall biosynthesis, such as penicillin.

    243. The enzyme that is present in the saliva of man is

    (1) Pepsin 
    (2) Renin
    (3) Amylase 
    (4) Trypsin
    Answer:
    243. (3) Amylase is an enzyme that catalyses the breakdown of starch into sugars. Amylase is present in human saliva, where it begins the chemical process of digestion. Foods that contain much starch but little sugar, such as rice and potato, taste slightly sweet as they are chewed because amylase turns some of their starch into sugar in the mouth. The pancreas also makes amylase (alpha amylase) to hydrolyse
    dietary starch into disaccharides and trisaccharides which are converted by other enzymes to glucose to
    supply the body with energy. Plants and some bacteria also produce amylase. As diastase, amylase was the first enzyme to be discovered and isolated.

    244. Blood cancer is otherwise called as

    (1) Anaemia
    (2) Polycythemia
    (3) Leucopenia
    (4) Leukaemia
    Answer:
    244. (4) Leukemia is a type of cancer of the blood or bone marrow characterized by an abnormal increase of immature white blood cells called “blasts”. Leukemia is a broad term covering a spectrum of diseases. In turn, it is part of the even broader group of diseases affecting the blood, bone marrow, and lymphoid system, which are all known as hematological neoplasms.

    245. Radioimmunoassay (RIA) is a therapy used

    (1) to cure lung cancer
    (2) to cure AIDS
    (3) to cure fractures in bones
    (4) to detect antibodies and hormones present in the blood samples
    Answer:
    245. (4) Radioimmunoassay (RIA) is a very sensitive in vitro assay technique used to measure concentrations of antigens (for example, hormone levels in the blood) by use of antibodies. As such, it can be seen as the inverse of a radiobinding assay, which quantifies an antibody by use of corresponding antigens. Although the RIA technique is extremely sensitive and extremely specific, requiring specialized equipment, it remains the least expensive method to perform such tests. It requires special precautions and licensing, since radioactive substances are used. Today it has been supplanted by the ELISA method. 

    246. Which one of the following is not a true snake ?

    (1) Glass snake
    (2) Sea snake
    (3) Tree snake
    (4) Blind snake
    Answer:
    246. (1) The glass lizards or glass snakes, genus Ophisaurus, are a group of reptiles that resemble
    snakes, but are actually lizards. Although most species have no legs, their head shape and the fact that they have movable eyelids and external ear openings identify them as lizards. A few species have very small stub-like legs near the rear vent. These are vestigial organs meaning they have evolved and they are no longer in use. These animals are also known as Glass Snakes or Jointed Snakes.

    247. Which one of the following set belongs to the class Mammalia ?

    (1) Lion, Hippopotamus, Penguin, Bat.
    (2) Lion, Bat, Whale, Ostrich
    (3) Hippopotamus, Penguin, Whale, Kangaroo
    (4) Whale, Bat, Kangaroo, Hippopotamus
    Answer:
    247. (4) Mammals are members of class Mammalia, airbreathing vertebrate animals characterized by the possession of endothermy, hair, three middle ear bones, and mammary glands functional in mothers
    with young. Most mammals also possess sweat glands and specialized teeth. The largest group of
    mammals, the placentals, have a placenta which feeds the offspring during gestation. Among the mammals, pigs, hippopotamus, camels, giraffe, deer, antelope, cattle, sheep, goats belong to Order Artiodactyla; Order Cetacea: whales, dolphins and porpoises; etc. Mammals range in size from the 30–40 millimeter (1- to 1.5-inch) bumblebee bat to the 33-meter (108- foot) blue whale.

    248. Which one of the following pairs belongs to cartilaginous fish ?

    (1) Shark and Tuna
    (2) Shark and Ray
    (3) Skates and Hilsa
    (4) Ray and Eel
    Answer:
    248. (2) Chondrichthyes or cartilaginous fishes are jawed fish with paired fins, paired nares, scales, a twochambered heart, and skeletons made of cartilage rather than bone. The cartilaginous fish are so named because their skeleton is composed of cartilage which is not reinforced by the minerals that make bone. It includes elasmobranchs: sharks, rays and skates, etc.

    249. Which one of the following is not a true fish ?

    (1) Silver fish
    (2) Saw fish
    (3) Hammer fish
    (4) Sucker fish
    Answer:
    249. (1) Lepisma saccharina, frequently called a silverfish or fishmoth is a small, wingless insect in the order Thysanura. Silverfish are always wingless and are silvery to brown in colour because their bodies are covered with fine scales. They are generally soft bodied. Its common name derives from the animal’s silvery light grey and blue colour, combined with the fish-like appearance of its movements, while the scientific name indicates the silverfish’s diet of carbohydrates such as sugar or starches.

    250. Johann Gregor Mendel is famous for propounding

    (1) Theory of mutation
    (2) Laws of heredity
    (3) Cell theory
    (4) Theory of acquired characters
    Answer:
    250. (2) The Laws of Heredity are few; their implications for life are vast. The simplest genetic characteristics are those whose presence depends on the genotype at a single locus; i.e., one gene controls the expression of one characteristic. Such characters are known as Mendelian, after their original discoverer, the Austrian botanist Gregor Mendel. Over 10,000 Mendelian characters have been identified in humans. Mendelian laws of inheritance are statements about the way certain characteristics are transmitted from one generation to another in an organism.

    251. Which of the following has no skeleton at all ?

    (1) Star fish 
    (2) Sponge
    (3) Jelly fish 
    (4) Silver fish
    Answer:
    251. (4) Silverfish are always wingless and are silvery to brown in color because their bodies are covered with fine scales. They are generally soft bodied.

    252. What is an endoscope ?

    (1) It is an optical instrument used to see inside the alimentary canal
    (2) It is a device which is fitted on the chest of the patient to regularise the irregular heart beats
    (3) It is an instrument used for examining ear disorders
    (4) It is an instrument for recording electrical signals produced by human muscles
    Answer:
    252. (1) Endoscopymeans looking inside and typically refers to looking inside the body for medical reasons using an endoscope, an instrument used to examine the interior of a hollow organ or cavity of the body. Unlike most other medical imaging devices, endoscopes are inserted directly into the organ. Endoscopy can also refer to using a borescope in technical situations where direct line of-sight observation is not feasible. The following conditions and illnesses are most commonly investigated or diagnosed with an endoscopy: breathing disorders; chronic diarrhea; internal bleeding; irritable bowel syndrome; stomach ulcers, etc.

    253. The age of a tree can be determined more or less accurately by

    (1) counting the number of branches
    (2) measuring the height of the tree
    (3) measuring the diameter of the trunk
    (4) counting the number of rings in the trunk
    Answer:
    253. (4) When a tree has been cut down or felled, then it is relatively easy to work out its age by counting the growth or annual rings that can be seen on the sawnoff stump. Under the bark of a tree is a special tissue (called the cambium) which forms new cells so that the tree can grow. Differences in the rate at which cells are produced by this tissue give rise to the annual or growth rings. If conditions are good for growth (warm, regular rainfall) then the ring that is formed will be wider than that created in a year where the tree struggles for water, or it is cold. There is one ring for each year of a tree’s life.

    254. Of all micro-organisms, the most adaptable and versatile are

    (1) Viruses 
    (2) Bacteria
    (3) Algae 
    (4) Fungi
    Answer:
    254. (1) The viruses are adaptable and versatile with many variations worldwide and they reproduce within the cells of the immune system of infected people. Therefore virus collections are indispensable
    instruments in the development of a vaccine. Versatility is distinctive abilities and skills in productively managing a variety of situations. Adaptability is the amount of flexibility and versatility an individual has developed to respond to changing interpersonal situations and environmental requirements.

    255. The disease in which the sugar level of blood increases is known as

    (1) Diabetes mellitus
    (2) Diabetes insipidus
    (3) Diabetes imperfectus
    (4) Diabetes sugarensis
    Answer:
    255. (1) Diabetes mellitus, or simply diabetes, is a group of metabolic diseases in which a person has high blood sugar, either because the pancreas does not produce enough insulin, or because cells do not
    respond to the insulin that is produced. This high blood sugar produces the classical symptoms of
    polyuria (frequent urination), polydipsia (increased thirst) and polyphagia (increased hunger).

    256. Which one of the following is not a mosquito borne disease?

    (1) Dengue fever
    (2) Filariasis
    (3) Sleeping sickness
    (4) Malaria
    Answer:
    256. (3) Sleeping sickness is infection with germs carried by certain flies. It results in swelling of the brain. Sleeping sickness is caused by two germs, Trypanosoma brucei rhodesiense and Trypanosomoa
    brucei gambiense. The more severe form of the illness is caused by T. rhodesiense. Tsetse flies carry the infection.

    257. Who has been conferred the Dada Saheb Phalke Award (Ratna) for the year 2007 ?

    (1) Dev Anand
    (2) Rekha
    (3) Dilip Kumar
    (4) Shabana Azmi
    Answer:
    257. (*) The Dadasaheb Phalke Award is India’s highest award in cinema given annually by the Government of India for lifetime contribution to Indian cinema. Prabodh Chandra Dey, better known by his nickname Manna Dey, received the Dadasaheb Phalke Award in 2007. The Government of India honoured Dev Anand with the Padma Bhushan in 2001 and the Dadasaheb Phalke Award in 2002 for his contribution to Indian cinema. Rekha and Shabana Azmi have not received this award so far. The Government of India honoured Dilip Kumar with the Padma Bhushan in 1991 and the Dadasaheb Phalke Award in 1994 for his contributions towards Indian cinema.

    258. Which one of the following is the tallest bird?

    (1) Peacock 
    (2) Penguin
    (3) Ostrich 
    (4) Emu
    Answer:
    258. (3) The largest living bird is the ostrich (Struthio camelus), from the plains of Africa and Arabia. A large male ostrich can reach a height of 2.8 m (9.2 ft), weighing over 156 kg (345 lb).

    259. Which one of the following animals is called farmer’s friend ?

    (1) Ant 
    (2) Earthworm
    (3) Bee 
    (4) Butterfly
    Answer:
    259. (2) Earthworms travel underground by the means of waves of muscular contractions which alternately shorten and lengthen the body. The shortened part is anchored to the surrounding soil by tiny claw-like bristles (setae) set along its segmented length. In all the body segments except the first, last and clitellum, there is a ring of S-shaped setae embedded in the epidermal pit of each segment (perichaetine). The whole burrowing process is aided by the secretion of lubricating mucus. Worms can make gurgling noises underground when disturbed as a result of the worm moving through its lubricated tunnels. They also work as biological “pistons” forcing air through the tunnels as they move. Thus earthworm activity aerates and mixes the soil, and is constructive to mineralization and nutrient uptake by vegetation. Certain species of earthworm come to the surface and graze on the higher concentrations of organic matter present there, mixing it with the mineral soil. Because a high level of organic matter mixing is associated with soil fertility, an abundance of earthworms is beneficial to the
    organic gardener.

    260. The term ‘gene’ was coined by

    (1) T. H. Morgan
    (2) W. L. Johanssen
    (3) G. Mendel
    (4) De Vries
    Answer:
    260. (2) Wilhelm Johannsen was a Danish botanist, plant physiologist and geneticist. His most well-known research concerned so-called pure lines of the selffertile common bean. He was able to show that even in populations homozygous for all traits, i.e. without genetic variation, seed size followed a normal distribution. This was attributable to resource provision to the mother plant and to the position of seeds in pods and of pods on the plant. This led him to coin the terms phenotype and genotype and first used in his paper Om arvelighed i samfund og i rene linier and in his book Arvelighedslærens Elementer.] This book was rewritten, enlarged and translated to German as Elemente der exakten Erblichkeitslehre.It was in this book Johannsen introduced the term gene. This term was coined in opposition to the then common pangene that stemmed from Darwin’s theory of pangenesis.

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