MCQ LIFE SCIENCE COMPETITIVE EXAM
1. Lyon’s hypothesis is connected with
(a) Number of barr bodies (b) Genetic compatibility
(c) Genetic incompability (d) Centromere position
2. A woman has child with Klinefelter’s syndrome. Number of barr bodies present in the child is
(a) One (b) Two (c) Three (d) None
3. Hexaploid wheat is
(a) Triticum turgidum (b) Triticum aestivum (c) Triticum monococcum (d) Triticum durum
4. Puffs or balbiani rings in salivary gland chromosomes are sites of
(a) DNA replication (b) DNA duplication (c) RNA synthesis (d) Protein synthesis
5. Which of the following disease is sex linked ?
(a) Colour blindness (b) Malignancy (c) Hepatitis (d) Leukemia
6. Maize has 10 pairs of chromosomes . How many linkage groups does it have ?
(a) 20 (b) 10 (c) 5 (d) 40
7. The mutation which returns to the original state is called
(a) Reversible mutation (b) Lethal mutation (c) Backward mutation (d) Abnormal mutation
8. Y-chromose is
(a) Acrocentric (b) Telocentric (c) Submetacentric (d) Acentric
9. Who proposed the concept of ‘ecological niches’ ?
(a) Tansley (b) Richter (c) Elton (d) Odum
10. Vivipary is exhibited by
(a) Cocos nucifera (b) Rhizophora (c) polygonum (d) both a and b
11. Soil transported by wind is called
(a) alluvial (b) colluvial (c) eolian (d) glacial
12. Darkness loving organisms are
(a) photophile (b) scotiphile (c) nocturnal (d) crepuscular
13. Heavy metals are detoxified in plants by
(a) ABA (b) allelopathins (c) phytochelatins (d) phytoalexins
14. Which of the following is a secondary pollutant ?
(a) SO2 (b) SO3 (c) H2S (d) NO2
15. First polypeptides were formed
(a) Without the involvement of RNA (b) With help of RNA
(c) With the help of RNA (d) none above
16. Which of the following is correctly matched ?
(a) Weismann-Germplasm theory (b) De Vries - Abiogensis
(c) Abbe Spallanzani- Recapitulation theory (d) none above
17. Louis Pasteur is famous for
(a) recapitulation (b) germ theory of disease (c) cell theory (d) both (a) and (c)
18. Homonids orginated during
(a) pliocene (b) palaeocene (c) miocene (d) oligocene
19. The organisms of which of the following kingdoms characteristically show cyclosis ?
a) Monera b) Protista c) Fungi d) Animalia
20. When generic name is repeated in specific name of a plant is called
(a) synonym (b) autonym (c) tautonym (d) none of above
21. One of the following are ‘amphibians of plant kingdom’
(a) Thallophytes (b) Bryophytes (c) Angiosperms (d) Gymnosperms
22. On infection viruses inject into the host
(a) proteins (b) nucleic acid (c) nucleoproteins (d) lipids
23. Interferon suppresses the pathogenic activity of
(a) bacteria (b) virus (c) protozoa (d) helminths
24. Hereditary material in TMV is
(a) dsDNA (b) ssDNA (c) ssRNA (d) dsRNA
25. Bacterial ribosomes are present
(a) in the cytoplasm (b) on the endoplasmic reticulum
(c) on the nuclear membrane (d) on the cell wall
26. Which of the following is an example of live vaccine ?
(a) TAB vaccine (b) Pertussis vaccine (c) Miningococcal vaccine (d) BCG vaccine
27. A snail’s shell is made up of
(a) silica (b) nitrogenous polysaccharide (c) calcium carbonate (d) sodium carbonate
28. Pearl can be produced by
(a) Oyster (b) Nautilus (c) Doris (d) Chiton
29. In the following diagram of a leg of Crckroach parts have been indicated by alphabets. Choose the answer in which these alphabets have been correctly matched with the parts which they indicate
(a) A = Coxa, B = femur, C = trochanter, D = Tarsus, E = tibia
(b) A = Coxa, B = tibia, C = tarsus, D = femur, E = trochanter
(c) A = Coxa, B = trochanter, C = femur, D = tibia, E = tarsus
(d) A = Coxa, B = tarsus, C = femur, D = tibia, E = trochanter
30. Spoilage of oil can be detected by which fatty acid
(a) oleic acid (b) linolenic acid (c) linoleic acid (d) erucic acid.
31. During DNA replication, the strands separate by
(a) DNA polymerase (b) topoisomerase (c) unwindase/helicase (d) gyrase.
32. Two similar holotypes are called
(a) Mesotypes (b) Meotypes (c) Syntypes (d) Isotypes.
33. BHNS is abbreviation of
(a) Banaras Natural History Society (b) Bombay Natural History Society
(c) Botanical North Himalayan Survey (d) Biological Natural History Society.
34. Which ones do not have cellular structure
(a) PPLO (b) Rickettsia (c) Viruses (d) Archaebacteria.
35. Hardness of woody tissue-is due to
(a) Silica (b) Lignin (c) Cellulose (d) Suberin.
36. Cyclosis is caused by activity of
(a) Microtubules (b) Microfilaments (c) Intermediate filaments (d) All the above.
37. rRNA present in 60 S subunit of ribosome is
(a) 5S (b) 5.8S (c) 28 S (d) All the above.
38. Golgi complex is not found in
(a) Nerve cells (b) RBCs (c) Germ cells (d) All the above.
39. Balbiani rings (puffs) are sites of
(a) DNA replication (b) RNA and protein synthesis
(c) Synthesis of polysaccharides (d) Synthesis of lipids.
40. Shape of metacentric chromosome in anaphase is
(a) L-shaped (b) V-shaped (c) J-shaped (d) I-shaped.
41. Phagosomes and pinosomes are collectively called
(a) Residual bodies (b) Autophagic bodies (c) Digestive vacuoles (d) Endosomes.
42. Mitotic spindle is composed of
(a) Actin (b) Actinomyosin (c) Myoglobin (d) None of the above.
43. In the beginning of meiosis, a meiocyte has 16 pg of DNA. The amount in a gamete will be
(a) 16 pg (b) 8 pg (c) 4 pg (d) 32 pg.
44. ‘polygenic inheritance in human beings is
(a) Skin colour (b) Phenylketonuria (c) Colour blindness (d) Sickle cell anaemia.
45. Cross AABb × aaBb yields AaBB : AaBb: Aabb: aabb offspring in the ratio of
(a) 0 : 3 : 1 : 1 (b) 1 : 2 : 1 : 0 (c) 1 : 1 : 1 : 1 (d) 1 : 2 : 1 : 1.
46. Percentage of colour blindness is white male population is
a) 1.5% b) 2.5% c) 5.9% d) 8%.
47. Turner’s syndrome is due to
a) Trisomy of chromosome 21 b) Trisomy of chromosome 18
c) Autosomal recessive gene d) Absence of one sex chromosome.
48. According to Neo Darwinism, evolution is due to
a) Gene flow b) Change in gene structure
c) Change in size of gene pool d) Change in gene frequency.
49. Which one can respire in the absence of oxygen ?
a) Seeds b) Leaves c) Stem d) Root.
50. R.Q. of 4 is obtained when respiratory substrate is
a) Oxalic acid b) Malic acid c) Tartaric acid d) Glucose.
51. a - Ketoglutarate dehydrogenase brings about
a) Oxidation and decarboxylation b) Oxidation
c) Decarboxylation d) Reduction.
52. Animal group with pseudocoelom is
a) Echinoderms b) Molluscs c) Aschelminthes/Nematodes d) Anneelids.
53. Natural parthenogenesis is found in
a) Pheretima b) Frog c) Star Fish d) Honey Bee.
54. Excretion in tadpole is
a) Ureotelic b) Ammonotelic c) Uricotelic d) None of these.
55. Kupffer’s cells occur in
a) Spleen b) Kidney c) Brain d) Liver.
56. The layer of cells that secrete enamel of tooth is
a) Osteoblast b) Odontoblast c) Dentoblast d) Ameloblast.
57. Blood analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin content. Which of the following conclusions is most likely to be correct ?
The patient has been inhaling polluted air containing unusually high content of
a) Carbon disulphide b) chloroform c) Carbon dioxide d) Carbon monoxide.
58. Child death may occur in the marriage of
a) Rh+ man and Rh+ woman b) Rh+ man and Rh- woman
c) Rh- man and Rh- woman d) Rh- man and Rh+ woman.
59. Rate of heart beat is determined by
a) Purkinje fibres b) Papillary muscles c) AV – node d) SA – node.
60. Concentration of urine depends upon which organ ?
a) Bowman’s capsule b) Length of Henle’s loop
c) P.C.T. d) Network of capillaries arising from glomerulus.
61. Which statement is correct for muscles contraction ?
a) Length of H – zone decreases b) Length of A – band remains constant
c) Length of I – band increases d) Length of two Z – line increases.
62. Which cranial nerve has the highest number of branches ?
a) Vagus nerve b) Trigeminal nerve c) Facial nerve d) None of these.
63. Which one of the following is not a secondary messenger in hormone action ?
a) cAMP b) cGMP c) Calcium d) Sodium.
64. Middle piece of mammalian sperm possesses
a) Mitochondria and centriole b) Mitochodria only
c) Centriole only d) Nucleus and mitochondria.
65. Enzymes PEP carboxylase and RuBP carboxylase are located in chloroplasts of
a) C3 plants b) CAM plants c) C4 plants d) Both (B) and (C).
66. Electron acceptor of PS II is
a) Cyt b b) FRS c) PQ d) NADP+.
67. In coconut, the edible part is
a) Endocarp b) Endosperm c) Edicarp d) Mesocarp.
68. Caulimo (Cauliflower Mosaic) viruses have
a) Double stranded DNA b) Single stranded DNA
c) Single stranded RNA d) Double stranded RNA.
69. Bacteria generally move due to
a) Chemotaxis b) Thermotaxis c) Phototaxis d) Thermotropism.
70. Cyclin protein is required for cell cycle, which other molecule is essential for completion of cell cycle ?
(a) CCK (b) CKc (c) CdK (d) CKd
71. What type of zones are recognized in deep ponds and lakes ?
(a) Limnetic zone (b) Littoral zone (c) profundal zone (d) Both A and B
72. Allosomes are colled -
(a) Sex-chromosomes (b) Beaded structures on chromosome
(c) Nod like structure on chromosome (d) A group of plasmids
73. Glyoxysomes are connected with metabolism of
a) Fats b) Proteins c) Carbohydrates d) All the above
74. A dihybrid ratio 1 : 4 : 6 : 4 : 1 is obtained instead of 9 : 3 : 3 : 1. This is an example of
a) Complementary genes b) Supplementary genes
c) Polygenic inheritance d) Pleiotropic genes.
75. Resolution power is the ability to
a) Distinguish two close points b) distinguish two close objects
c) Distinguish amongst organelles d) magnify image.
76. Anticodon is an unpaired triplet of bases in an exposed position of
a) t-RNA b) m-RNA c) r-RNA d) both ‘b’ and ‘c’
77. Bacterial movement is –
a) Chemotaxos b) Thermotaxis c) Phototaxis d) Thermotropism.
78. Heinsen diese is –
a) Small pox b) Chollera c) Leprocy d) Leptospirilosys.
79. Porin is –
a) Develpoment of bacterial surface for conjugation and adhesion
b) Inter cellular hollow space c) Peripheral mesosome d) protein system.
80. Glycolet is stored in chloroplast
a) High CO2 concentration b) High intens light
c) when the temperature is low d) when the density of CO2 is low.
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