Practice Set I for Biology MCQ

 

1.The patient of this disease exhibit memory loss (particularly for recent events), shortened

attention span, disorientation and eventual language loss.

(a) Cancer         (b) AIDS               (c) Alzheimers disease          (d) Cystic fibrosis

 

2. This tumour normally confined to their original location and do not spread to other parts of the body

(a) malignant tumour       (b) metastasis            (c) benign tumour            (d) cancer

 

3.Certain bacteria living in the soil poor in oxygen, convert nitrates into nitrites and then to free nitrogen and such bacteria are termed as

(a) nitrogen fixing bacteria                           (b) denitrifying bacteria

(c) ammonifying bacteria                              (d) saprophytic bacteria

 

4. A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective lens. He should illuminate the object by which of the following colour of light, so as to get the best possible resolution ?

(a) yellow                   (b) green                          (c) blue                         (d) red

 

5.Who discovered that restriction enzymes have the capability of cutting DNA strands in a particular fashion, which left what has became known as ‘sticky ends’ on the strands?

(a) Ramdeo Mishra           (b) Stanley Cohen           (c) Herbert Boyer         (d) James D. Watson

 

6. Viroids have

(a) double stranded RNA enclosed by protein coat

(b) double stranded DNA enclosed by protein coat

(c) single stranded_DNA not enclosed by protein coat

(d) single stranded RNA not enclosed by protein coat

 

7. Formation of non-functional methaemoglobin cause blue-baby syndrome. This is due to

(a) excess of arsenic concentration in drinking water

(b) excess of nitrates in drinking water

(c)deficiency of iron in food

(d) increased methane content in the atmosphere

 

8. Scientific names were given to the organisms, because

(a) every technical branch has its own terminology

(b) scientists wanted to impress people with difficult words

(c) it facilitated scientific communication without confusion .

(d) scientists wanted to keep' common people aloof from studing biology

 

9. A Zwitterion is

(a) Positive ion          (b) Negative ion        (c) Both (a) and (b)         (d) Non protein amino acid

 

10. Essential fatty acid:

(a)Linoleic acid                  (b) Linolenic acid          (c) Arachidonic acid               (d) All these

 

11.Characteristic features of active site are

(a) Flexible in nature              (b) Site of binding           (c) Acidic                (d) Both (a) and (b)

 

12. Ribozymes:

(a) RNA enzyme       (b) Non-protein enzymes         (c) Catalyst function              (d) All of these

 

13. While the light reaction of photosynthesis is going on, the pH of the matrix of thylakoids in comparison with the pH of the fluid in stroma would be -

(a) variable               (b) higher                        (c) identical                        (d) lower

 

14.A scion from a short day plant was grafted on the stalk of long day plant. The flowering response of the grown plant will be like a -

(a) non-flowering plant      (b) long day plant       (c) day neutral plant     (d) short day plant

 

15. Ram was studing anatomy of young roots of maize, mangolia, pine and money plant. He forgot to label the slides. If he finds only sieve cells without sieve tubes and companion cells, this slide has to be of:

(a) Pine                (b) Money plant                (c) magnolia                     (d) Maize.

 

16. 10. Which of the following molecules contains the most stored energy?

(a)   Glucose               (b) ATP                (c) NADPH          (d)  Starch

 

17.If a cell has 46 chromosomes at the beginning of meiosis, then at anaphase-I there would be a total of

(a) 23 chromatids         (b) 23 chromosomes       (c) 46 chromosomes    (d) 46 chromatids

 

18. All of the following statements are true except

(a) Spindle fibers are composed largely of microtubules.

(b)Centrioles consist of nine triplets of microtubules arranged in a circle.

(c)All eukaryotic cells have centrioles.

(d)All eukaryotic cells have a spindle apparatus.

 

19. In fruit flies, dumpy wings are shorter and broader than normal wings. The allele for normal wings (D) is dominant to the allele for dumpy wings (d). Two normal-winged flies were mated and produced 300 normal-winged and 100 dumpywinged flies. The parents were probably

(a)DD and DD           (b) DD and Dd            (c) Dd and Dd          (d) Dd and dd

 

20. A human genetic defect that is caused by nondisjunction of the sex chromosomes is

(a)  sickle-cell disease      (b) hemophilia            (c) Down syndrome          (d) Turner syndrome

 

21.The function of the endosperm in angiosperms is to provide

(a) nourishment for the pollen             (b) nourishment for the developing embryo

(c) material for fruit development       (d) material for the seed coat

 

22. Angiosperms differ from all other plants because

(a) they produce a pollen tube                                   (b) they produce wind-dispersed pollen

(c) the sporophyte generation is dominant               (d)they produce fruits

 

23. A body cavity completely surrounded by tissue derived from the mesoderm that provides cushioning for internal organs is called

(a) an archenteron      (b) a coelom        (c) a pseudocoelom             (d) a gastrovascular cavity

 

24. A characteristic common to all chordates that is lacking in other animal groups is

(a) the appearance of pharyngeal gill slits         (b) the presence of three germ layers

(c)the presence of vertebrae                                (d) a true coelom

 

25.Root hairs occur on

(a) epidermal cells in the zone of cell division    

(b) epidermal cells in the zone of maturation

(c) parenchyma cells in the zone of elongation          

(d) parenchyma cells in the zone of maturation

 

26. All of the following contribute to flowering mechanisms  except:

(a) photoperiodism          (b) phytochrome    (c) length of night or day light     (d) chlorophyll

 

28. Which of the following would normally contain blood with the least amount of oxygen?

(a)The left ventricle   (b)The left atrium   (c)The pulmonary veins   (d)The pulmonary arteries

 

29. Systolic blood pressure is maintained by the

(a) left atrium           (b) right atrium          (c) left ventricle       (d) right ventricle

 

30. Which of the following is an example of an excretory mechanism?

(a) Antibodies        (b) The digestive tract      (c) Flame cells         (d) Neurosecretory cells

 

31. When the filtrate moves through the nephron, solutes

(a) become less concentrated as they move down the descending limb of the loop of Henle

(b) become less concentrated as they move up the ascending limb of the loop of Henle

(c) become less concentrated as they move down the collecting duct

(d) are most concentrated when they enter the Bowman’s capsule

 

32. Which of the following is the last step leading up to muscle contraction that occurs just before a myofibril contracts?

(a) Tropomyosin exposes binding sites on actin.                 (b) ATP binds to myosin.

(c) Sarcoplasmic reticulum releases Ca2+                             (d) ATP is converted to ADP + Pi

 

33. Which of the following would be activated first in response to a body cell that has been invaded by a virus?

(a)  Cytotoxic T cells         (b) Natural killer cells        (c) Antibodies          (d) Macrophages

 

34. Chromoprotein among the following is:

(a) endorphin (b) rhodopsin  (c) FSH     (d) phosphoprotein

 

35. The molecule given below is:

(a) Glucose (b) Fructose (c) Sucrose (d) Galactose

 

36. The genes, which remain confined to differential region of Y – chromosome, are

a) Autosomal genes b) Holandric genes

c) Completely sex – linked genes d) mutant genes.

 

37. Christmas factor is synonymous with

a) Proconvertin   b) Antihemophilic factor – B       c) Platelet accelerator d) Factor XI

 

38. Among the anticoagulants normally present in an animal is

a) Dicumarol b) Heparin c) Vitamin – K d) Lipoprotion lipase

 

39. ICBN was adopted in

a) 1951 b) 1961 c) 1971 d) 1985.

 

40. Which of the following book was not written by Linnaeus ?

a) Systema Nature  b) Species Plantarum    c) Genera Plantarum d)Historia Plantarum.

 

41. The outer layer of vacuole is called

a) plasmalemma b) tonoplast c) plasmolayer d) leucoplast.

 

42.The middle piece of the sperm contains

(a) centriole               (b) nucleus                  (c) proteins                   (d) mitochondria

 

43. In most mammals, the testes are located in scrotal sac for

(a)spermatogenesis                                          (b) sex differentiation  

(c) more space to visceral organs                   (d) independent functioning of kidney

 

44. In which pre-historic man's period was proper burial of dead bodies started ?

(a) Cromagnan     (b) African ape    (c) Peking man   (d) Neanderthal man

 

45. One of the example of the action of autonomous nervous system is

(a) knee-jerk response                   (b) pupillary reflex    

(c) swallowing of food                    (d) peristalsis of the intestines

 

46.Which of the following part of human brain is associated with integration of parasympathetic activities ?

(a) cerebrum         (b) neopallium             (c) hypothalamus                       (d) medulla

 

47.The part of brain, which is responsible for sense of smell, is

(a) cerebrum          (b) optic lobe                  (c) olfactory lobe                    (d) medulla

 

48. The part of brain, that controls body temperature, is

(a) cerebrum            (b) cerebellum                   (c) diencephalon                          (d) medulla

 

49. Broca’s area in human brain controls

(a) movement of tongue    (b) breathing    (c) movement of vocal cords      (d) both '1' and '3'

 

50. In mammals, the corpus callosum connects '

(a) a muscle to- a bone                              (b) one bone to another bone  

(c) two cerebral hemispheres                    (d)  hindbrain to medulla oblongata

 

51.What is the function of copper-T ?

(a) checks mutation                              (b) stops fertilization  

(c)stops zygote formation                    (d) stops oblituation of blastocoel

 

52. When population reaches its carrying capacity, then

(a) mortality rate = birth rate               (b) mortality rate > birth rate

(c) mortality rate < birth rate               (d) birth rate natality rate

 

53. ln sigmoid population growth curve, the initial stage of the curve is called ,

(a) lag phase      (b) log phase     (c) plateau rate         (d) exponential phase

 

54.Vulnerable species are those species which are

(a) wild in nature                             (b) live in national parks

 (c) in dangerof extinction              (d) likely to be endangered

 

55. The genetic code is degenerate. It means that

(a) it always generates                                                

(b) it does not generate A

(c) most amino acids have only one codon G  

(d) most amino acids have more than one codon

 

56.In transgenics, expression of transgene  in target tissue is determined by

(a) reporter             (b) enhancer                 (c) transgene                      (d) promoter

 

57.The process by  which m-RNA is made by DNA and protein are respectively called

(a) synthesis of m-RNA                           (b) translation and transcription

(c) transcription and translation          (d) replication of m-RNA and protein

 

58.Which of the following is used mostly in genetic engineering ?

(a) Bacillus           (b) Clostridium           (c) Pseudomonas            (d) Agrobacterium

 

 59.Somaclonal variation can be obtained by

(a) hybridization                                      (b) tissue culture

(c) application of colchicine                    (d) irradiation with gamma rays

 

60. “Molecular scissors” used in genetic engineering is

(a) helicase         (b) DNA ligase     (c) DNA polymerase       (d) restriction endonuclease

 

61. The recent increase in food production is due to

(a) control of pests          (b) use of fertilizers       (c) crop improvement     (d) all of these

 

62.The plant raised from a single germinating pollen grain under cultural condition is called  (a) haploid plant    (b) diploid plant         (c) tetraploid plant       (d) polyploid plant

 

63.Azospirillum forms

(a) mycorrhizal association with pine roots

(b) free living but nitrogen fixing reactions

(c) loose association with the roots of grasses

(d) symbiotic association with root nodules of legumes

 

64. Which of the following mineral is essential for the preventation of dental caries ?

(a) iron        (b) copper                (c) fluorine                          (d) all of these

 

65.Sertoli cells are found

(a) between the seminiferous tubules         (b) in the upper part of the fallopian tube

(c) in the germinal epithelium of ovary       (d) in the germinal epithelium of the seminiferous

 

66.The function of pineal body is

(a) seasonal and circadian sexual behavior           (b) lightening the skin colours

(c) to regulates the period of puberty                    (d) all of these

 

67. Neurohypophysis secretes

(a) ADH and oxytocin                    (b) oxytocin and estrogen  

(c) vasopression and GH               (d) vasopressin and estrogen

 

68. Iodine is associated with which of the following hormones ?

(a) secretin                     (b) oxytocin                   (c) thyroxin                          (d) calcitonin

 

69.Which increases the rate of oxidative processes.

(a) insulin          (b) placenta       (c) pituitary               (d) gonadotropins

 

70. Cornea transplant in humans is almost never rejected. This isbecause

(a) Its cells are least penetrable by bacteria              (b) It has no blood supply '

(c) It is composed of enucleated cells                         (d) It is a non-living layer

71.What will happen if the secretion of parietal cells of gastric glands is blocked with an inhibitor?

(a) Gastric juice will be deficient in chymosin

(b) Gastric juice will be deficient in pepsinogen

(c) In the absence of HCl secretion, inactive pepsinogen is not converted into the active enzyme pepsin

(d) Enterokinase will not be released form the duodenal mucosa and so trypsinogen is not converted to trypsin

 

72.What is vital capacity of our lungs ?

(a) Inspiratory reserve volume plus tidal volume

(b) Total lung capacity minus expiratory reserve volume '

(c) Inspiratory reserve volume plus expiratory reserve volume

(d) Total lung capacity minus residual volume .

 

73. The haemoglobin of a human foetus

(a) has a lower affinity for oxygen than that of the adult

(b) its affinity for oxygen is the same as that of an adult

(c) has only 2 protein subunits instead of 4

(d) has a higher affinity for oxygen than that of an adult

 

74.Which type of white blood cells are concerned with the release of histamine and the natural anticoagulant  heparin?

(a) Neutrophils           (b) Basophils                       (c) Eosinophils              (d) Monocytes

 

75.Which one of the following statement is correct ?

(a) There is no evidence of the existence of gills during embryogenesis of mammals

(b) All plant and animal cells are totipotent

(c)Ontogeny repeats phylogeny

(d) Stem cells are specialized cells

 

76.The finches of Galapogas islands provide an evidence in favour of

(a) devolution due to mutation           (b) retrogressive evolution

(c) biogeographical evolution              (d) special creation

 

77. The concept of chemical evolution is based on

(a) interaction of water, air and clay under intense heat

(b) effect of solar radiation on chemicals

(c) origin of life by combination of chemicals under suitable environmental conditions

(d) crystallization of chemicals

 

78. Industrial melanism as observed in peppered moth proves that

(a) the melanic form of the moth has no selective advantage over lighter industrial area

(b) the lighter-form moth has no selective advantage either in polluted or non-polluted area

(c) melanism is a pollution generated feature

(d) the true black melanic forms arised by  random mutation

 

79.Which one of the important consequences of geographical isolation is

(a) preventing speciation                                 (b) speciation through reproductive isolation

(c) random creation of new species               (d) no change in the isolated fauna

 

80.Adaptive radiation refers to

(a) evolution of different species from a common ancestor

(b) migration of members of a species to different geographical areas

(c) power of adaptation in an individual to variety of environments

(d) adaptations due to geographical isolation

 

82.Which of the following is a narcotic ?

(a) opium                       (b) bhang                         (c) cocaine                (d) all of these

 

83. Passive immunity is defined as immunity

(a) inherited from the parent

(b) achieved through vaccination

(c) acquired through first exposure to the disease

(d) achieved through the sera of other animals enriched in antibodies

 

84. DPT provides immunity against

(a) diphtheria         (b) tetanus                       (c) whooping cough        (d) all of these

 

85. Which of the following plant hormones stimulates the synthesis of α-amylase ?

(a) auxin                  (b) ethylene                     (c) gibberellin                 (d) abscissic acid

 

86. For the germination of which of the following dormant seeds, you will recommend scarification method as an effective treatment ? `

(a) rice              (b) coconut                   (c) cotton                    (d) sorghum

 

87. ln the Kreb’s cycle, the membrane bound enzyme involved in mitochondrial membrane is

(a) fumarase          (b) amylase         (c) cis-aconitase           (d) succinate dehydrogenase

 

88. Electron transport system in mitochondria is located in

(a) inner membrane                     (b) outer membrane  

(c) inner cristae space                  (d) inner membrane space

 

89.Multicellular branched rhizoids and leafy gametophytes are the characteristics of

(a) pteridophytes      (b) gyrnnosperms         (c) all bryophytes        (d) some bryophytes

 

90. Heterospory and seed habit are often exhibited by a plant possessing

 (a) bract                         (b) spathe                     (c) ligule                  (d) petiole

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