Biology GK Questions Quiz-2

Biology GK Questions Quiz-2

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

    21. The disease caused by Asbestos is :

    (1) Emphysema 
    (2) Paralysis
    (3) Diarrhoea 
    (4) Dysentery
    Answer:
    21. (1) Emphysema is the common lung disease caused by asbestos. Emphysema is a lung condition in which tiny air sacs in the lungs - alveoli - fill up with air. As the air continues to build up in these sacs, they expand, and may break or become damaged and form scar tissue. The patient becomes progressively short of breath. Emphysema is a type of COPD (chronic obstructive pulmonary disease).

    22. In the eye, colour vision is effected by the presence of :

    (1) Choroid coat
    (2) Sclerotic coat
    (3) Rods 
    (4) Cones
    Answer:
    22. (4) Cone cells, or cones, are photoreceptor cells in the retina of the eye that are responsible for color
    vision, they function best in relatively bright light, as opposed to rod cells that work better in dim light.
    Cone cells are densely packed in the fovea, but quickly reduce in number towards the periphery of the retina. It allow the perception of colour

    23. Which of the following is NOT one of the important steps in processing tea leaves?

    (1) Rolling 
    (2) Drying
    (3) Fermenting
    (4) Withering
    Answer:
    23. (3) Generally, there are four different tea categories that differ in processing methods. By withering, new picked leaves are thinly spread to dry during this process. Heated air is forced over the leaves if the
    climate is not suitable. The main goal of this process is to reduce the water content. By the end of
    withering, the leaves should be pliable enough to be rolled. From the withering racks, the leaves are now twisted and rolled so that the leaf cells are broken up. Oxidation is a bio-chemical process where oxygen is absorbed. It begins once the leaf membranes are broken during the rolling process. Oxidation causes the leaves to turn bright copper in color. During the stage of drying or firing, the leaves are dried evenly and thoroughly without being burnt. Firing the leaves stops the oxidation process.

    24. Dehydration in human body is caused due to the loss of :

    (1) vitamins 
    (2) salts
    (3) hormones 
    (4) water
    Answer:
    24. (4) dehydration is the condition where there is acute shortage of water in our body. This occurs when the amount of water leaving our body is greater than the amount consumed. There are three types of dehydration: hypotonic or hyponatremic (primarily a loss of electrolytes, sodium in particular), hypertonic or hypernatremic (primarily a loss of water), and isotonic or isonatremic (equal loss of water and electrolytes). In humans, the most commonly seen type of dehydration by far is isotonic (isonatraemic) dehydration which effectively equates with hypovolemia, but the distinction of isotonic from hypotonic or hypertonic dehydration may be important when treating people who become
    dehydrated.

    25. Which of the following is the largest living bird ?

    (1) Eagle 
    (2) Peacock
    (3) Ostrich 
    (4) Kiwi
    Answer:
    25. (3) Ostriches are the largest living species of bird. Ostriches usually weigh 200 to 285 pounds, although some male ostriches have been recorded with weights of up to 340 pounds

    26. In the case of test tube babies

    (1) egg is fertilized in the uterus.
    (2) embryo completes its development in a test tube.
    (3) embryo is placed in uterus after 2 months.
    (4) egg is fertilized outside mother’s body.
    Answer:
    26. (3) Prior of the implantation of the blastocyst the uterus of the recipi-ent mother should be made ready to receive the embryo. This is usually done with the hormonal treatment. The blastocyst is introduced into the uterus by one of the two methods - by using a catheter through the vagina and cervical canal to the womb or directly into the uterus through a cut made in the wall of the uterus. The womb of the mother under the influence of the hormones develops the endometrium and the blastocyst gets im-planted and the normal process of pregnancy continues.

    27. The age of trees is determined by its :

    (1) girth 
    (2) height
    (3) growth rings
    (4) general appearance
    Answer:
    27. (3) Growth rings can determine the age of the trees. Growth rings, also referred to as tree rings or annual rings, can be seen in a horizontal cross section cut through the trunk of a tree. Growth rings are the result of new growth in the vascular cambium, a layer of cells near the bark that is classified as a lateral meristem. These visible rings result from the change in growth speed through the seasons of the year, thus one ring usually marks the passage of one year in the life of the tree.

    28. Kidney disease in man is caused by the pollutant :

    (1) Cadmium 
    (2) Iron
    (3) Cobalt 
    (4) Carbon
    Answer:
    28. (1) Cadmium (Cd), a by-product of zinc production, is one of the most toxic elements to which man can be exposed at work or in the environment. Once absorbed, Cd is efficiently retained in the human
    body, in which it accumulates throughout life. Cd is primarily toxic to the kidney, especially to theproximal tubular cells, the main site of accumulation. Cadmium accumulates in the kidneys and may sometimes cause kidney failure when it is in excess.

    29. Fruits of this plant are found underground :

    (1) Potato 
    (2) Carrot
    (3) Groundnut 
    (4) Onion
    Answer:
    29. (3) The peanuts, or groundnut (Arachishypogaea), is a species in the legume “bean” family (Fabaceae). The cultivated peanut was probably first domesticated in the valleys of Peru. It is an annual herbaceous plant growing tall.

    30. A rare and endangered animal in Silent Valley is :

    (1) Musk deer
    (2) Tiger
    (3) Lion-tailed macaque
    (4) Rhinosores
    Answer:
    30. (3) Among the more significant inhabitants of the silent valley forests are the lion tailed macaque which is on list of endangered animal and the Silent Valley is one of their habitats on earth. The lion- tailed macaque is one of the most endangered primates of India, confined in distribution to the rainforests of southern Western Ghats. Habitat specialists, they have adapted themselves to the evergreen environments available in the south Indian states of Kerala, Karnataka and Tamil Nadu, It has recently been estimated that only 3,000 to 4,000 individuals survive in the wild.

    31. Quantity of fresh air required for a man is

    (1) 1000 cubic feet of air for every 20 minutes
    (2) 1000 cubic feet of air for every 20 seconds
    (3) 1000 cubic feet of air for every 10 minutes
    (4) 1000 cubic feet of air for every 10 seconds
    Answer:
    31. (1) Breathing sixteen times every minute an average volume of air amounting to 30 cubic inches, we find that the expired air amounts to no less than 17 cubic feet per hour. This contaminated air contains only 16 per cent of oxygen, and 4.5 per cent of carbonic acid gas, and is sufficient to vitiate no less than 3,000 cubic feet of fresh air. Pure fresh air contains from 0.03 to 0.04 per cent of carbonic acid gas, or at the most, .4 volumes per thousand volumes of air. Careful investigation shows that when further carbonic acid gas has been added raising the amount to more than .6 volumes per 1000 of fresh air that an unpleasant odour rapidly becomes perceptible and the air gets to be “close,” musty, or foul. According to these figures a person in a room ten feet square by ten feet high containing a 1000 cubic feet of air requires to have this air completely replaced twice during the hour so as to furnish 3,000 cubic feet of fresh air hourly in order to prevent the carbonic acid gas exceeding .06 per cent.

    32. Reserpine is used to :

    (1) reduce high blood pressure
    (2) increase blood pressure when it is low
    (3) alleviate pain
    (4) cure arthritis
    Answer:
    32. (1) Reserpine (Lannett’s Serpalan) is an indole alkaloid antipsychotic and antihypertensive drug that has been used for the control of high blood pressure. The antihypertensive actions of reserpine are a result of its ability to deplete catecholamines (among other monoamine neurotransmitters) from peripheral sympathetic nerve endings. These substances are normally involved in controlling heart rate, force of cardiac contraction and peripheral resistance.

    33. ‘ELISA’ test is employed to diagnose :

    (1) Polio virus
    (2) AIDS antibodies
    (3) Tuberculosis bacterium
    (4) Cancer
    Answer:
    33. (3) ELISA is an abbreviation for “enzyme-linked immuno-sorbent assay.” An ELISA test uses
    components of the immune system and chemicals to detect immune responses in the body (for example,
    to infectious microbes).It is used to detect the retrovirus antibodies. The ELISA test involves an enzyme (a protein that catalyzes a biochemical reaction). It also involves an antibody or antigen (immunologic molecules).

    34. Why excessive heating and repeated use of cooking oil is most undesirable?

    (1) The oil vapours can cause indoor pollution
    (2) Carcinogenic substances like benzpyrene are produced
    (3) Nutrient value of food is lost
    (4) Loss and wastage of oil
    Answer:
    34. (2) Heating an oil changes its characteristics and this means that oils regarded as being healthy at room temperature can become unhealthy when heated above certain temperatures. The smoking point is
    the temperature at which a particular fat or oil starts to smoke and break down creating acreolein, an
    obnoxious-smelling compound. A 2001 review found that polyunsaturated oils like soya, canola, sunflower, and corn oil degrade quickly to yield toxic compounds when heated and that prolonged consumption of these degraded polyunsaturated oils was linked to atherosclerosis, inflammatory joint disease and the development of birth defects.

    35. Which one of the following is a female sex hormone?

    (1) Estrogen 
    (2) Androgen
    (3) Oxytocin 
    (4) Insulin
    Answer:
    35. (1) Estrogen is the general name for a group of hormone compounds. It is the main sex hormone in
    women and is essential to the menstrual cycle. Although both men and women have this hormone, it is found in higher amounts in women, especially those capable of reproducing. Secondary sex characteristics, which are the defining differences between men and women that don’t relate to the
    reproductive system, are determined in part by estrogen.

    36. Clove, the commonly used spice, is obtained from the :

    (1) root 
    (2) stem
    (3) flower bud 
    (4) fruit
    Answer:
    36. (3) Cloves are the aromatic dried flower buds of a tree in the family Myrtaceae. The clove tree is an
    evergreen that grows to a height ranging from 8–12 m, having large leaves and sanguine flowers in
    numerous groups of terminal clusters. The flower buds are at first of a pale colour and gradually become green, after which they develop into a bright red, when they are ready for collecting.

    37. Labourers who do hard manual labour develop thick skin on their palms and soles due to :

    (1) thick epidermis
    (2) thick dermis
    (3) thick subcutaneous tissue
    (4) All of these
    Answer:
    37. (4) If we look at the dermis, the layer on the skin beneath the epidermis (outer layer), and a certain
    type of cell within this layer, called a fibroblast, we find that the fibroblasts in the soles and palms secrete higher levels of a protein known as dickkopf 1, or DKK1, than the fibroblasts in the dermis at other body sites. It is believed that the rich source of DKK1 in these areas affects the epidermal layer above it and creates the physical characteristics of thickened, paler skin. DKK1 thickens the epidermis by increasing the number of skin cells and their density. Three genes affected by DKK1 – keratin 9, áKLEIP and â-catenin – have been found to cause this thickening. Keratin 9 reinforces the skin against
    physical impact, áKLEIP aids in cell division (multiplying) and makes cells smaller and, finally, a
    reduction in â-catenin is also possibly involved in cell contraction (making the cells more compact).

    38. Maximum photosynthetic activity occurs in :

    (1) blue and red region of light
    (2) green and yellow region of light
    (3) blue and orange region of light
    (4) violet and orange region of light
    Answer:
    38. (1) Wavelength of light between 400 nm and 700 nm is most effective for photosynthesis. This light is called photosynthetically active radiation (PAR). Comparatively more photosynthesis occurs is red and blue regions though others have significant net photosynthesis. Light has maximum efficiency in red and minimum in blue region. In both these regions light is absorbed by chlorophylls. Red light favours more carbohydrate accumulation while blue light favours more protein synthesis.

    39. AIDS virus has :

    (1) single-stranded RNA
    (2) double-stranded RNA
    (3) single-stranded DNA
    (4) double-stranded DNA
    Answer:
    39. (1) AIDS viruses have single stranded RNA. It is composed of two copies of positive single-stranded RNA that codes for the virus’s nine genes enclosed by a conical capsid composed of 2,000 copies of the viral protein. The single-stranded RNA is tightly bound to nucleocapsid proteins.

    40. A ‘breath test’ used by traffic police to check drunken driving uses:

    (1) potassium dichromate-sulphuric acid
    (2) potassium perma-nganatesulphuric acid
    (3) turmeric on filter paper
    (4) silica gel coated with silver nitrate
    Answer:
    40. (1) The main constituent of alcohol is Ethanol and the concentration of ethanol in a sample can be
    determined by back titration with acidified potassium dichromate. Reacting the sample with an excess of potassium dichromate, all ethanol is oxidized to acetic acid. One major application for this reaction is in old police breathalyzer tests. When alcohol vapor makes contact with the yellow dichromate-coated crystals, the color changes from yellow to green. The degree of the color change is directly related to the level of alcohol in the suspect’s breath.

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