BIOLOGY SECTION (AFMC)
Question 1. A prokaryotic cell lacks: (a) nucleus (b) nuclear membrane (c) membrane bound organelles (d) all of these Question 2. Extranuclear inheritance is a consequence of the presence of genes in (a) ER and mitochondria (b) lysosomes and ribosomes (c) ribosomes and chloroplast (d) mitochondria and chloroplasts Question 3. Vesicles of smooth endoplasmic reticulum (SER) are most likely on their way to (a) plastids (b) lysosomes (c) nucleolus (d) golgi apparatus Question 4. Lysosomes are the store house of: (a) ATP (b) sugar (c) proteins (d) hydrolytic enzymes 5. Lipids are insoluble in water, because lipid molecules are: (a) neutral (b) zwitter ions (c) hydrophobic (d) hydrophilic 6. Which of the following is the simplest amino acid? (a) glycine (b) alanine (c) tyrosine (d) asparagine 7. Carbohydrates, ingested in the diet, are hydrolyzed by the enzyme: (a) pepsin (h) cellulase (c) cc-amylase (d) glycosidase 8. Stomach is the site of digestion mainly for (a) fats (b) proteins (c) carbohydrates (d) all of these 9. Which proteolytic enzyme induces lysis of fibrin during fibrinolysis? (a) fibrin (b) thrombin (c) plasmin (d) plate let factor VII 10. Which of the following enzymes is used to join bits of DNA? (a) ligase (b) primase (c) endonuctease (d) DNA polymerase 11. Ail eukaryotic genes contain two kinds of base sequences. Which of the following plays role in protein synthesis? (a) introns (b) exons (c) electrons (d) both 'a` and 'b' 12. The genetic material of prokaryotic cell is called? (a) nucleus (b) nucleolus (c) nucleoid (d) centromere 13. In prokaryotes, the genetic material is: (a) linear DNA with histones (b) circular DNA with histones (c) linear DNA without histones (d) circular DNA without histones 14. The direction of DNA replication is from (a) amino acid end (b) 3` end towards 5'end (c) 5' end towards 3' end (d) amino terminus to carboxy terminus 15. In operon concept, regulator gene functions as: (a) repressor (b) regulator (c) inhibrtor (d) initiator 16. The importance of meiosis lies in: (a) bringing discontinuous variations (b) addition in the number of chromosomes (c) reduction in die number of chromosomes (d) maintaining the number of chromosomes 17. la mitotic cell division, the division of centromere and the division of chromatid occurs between (a) anaphase and telophase (b) prophase and metaphase (c) telophase and interphase (d) anaphase and metaphase 18. In which stage of the first meiotic division, each chromosome undergoes longitudinal division to give rise to two sister chromatids? (a) zygotene (b) diplotene (c) diakinesis (d) pachytene 19. Mirabilis jalapa is an example of: (a) complete dominance (b) supplementary gene (c) incomplete dominance (d) complementary gene 20. Which of the following is dominant character according to Mendel? (a) dwarf plant and yellow fruit (b) terminal fruit and wrinkled seed (c) white testa and yellow pericarp (d) green coloured fruit and rounded seed 21. Lack of independent assortment of genes A and B in fruit fly Drosophila is due to (a) repulsion (b) linkage (c) crossing-over (d) recombination 22. When two mutations are located in the same functional unit or in different functional units, then it is confirmed by (a) test cross (b) back cross (c) reciprocal cross (d) complementation test 23. Prototherians are connectiong links between: (a) amphibians and aves (b) reptiles and mammals (c) fishs and amphibians (d) reptiles and amphibians 24. The pioneers in the field of 'organic evolution' are (a) Karl Landsieiner, Hugo de Vries, Malthus (b) Darwin, Hugo de Vries, Lamarck, Huxley (c) Lamarck, Karl Landesteiner, Malthus, Hugo de Vries (d) Darwin, Lamarck, Karl Landsteiner, Hugo de Vries 25. Drawin finches are related to which of the following evidences? (a) fossils (b) embryology (c) anatomy (d) geographical distribution 26. Allopatric sepeciation is due to (a) geographical separation of population (b) hybridization between closely related species (c) migration of the members of species from one to other population (d) both 2 and 3 27. Evolutionary convergence is characterized by: (a) development of characteristics by random mating (b) replacement of common characteristic in different groups (c) development of dissimilar characteristics in closely related groups (d) development of a common set of characteristics in groups of different ancestry 28. How many sub-phyla are available in Tracheata, according to Tippo's classification of kingdom plantae? (a) 4 (b) 6 (c) 8 (d) 10
29. The usage of binomial names, for plant species, was accepted by all after the publication of the works by: (a) Hooker (b) Linnaeus (c) Bentham (d) Darwin 30. What is a key stone species? (a) a rare species that has minimal impact on biomass and on other species in community (b) a dominant species that constitutes a large proportion of biomass, -which affects many other species (c) a common species that has plenty of biomass, yet has a fairly low impact on me community's organization (d) a species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the community's organization and survival 31. In biotic community, which of the following can be called protective device? (a) mimicry (b) symbiosis (c) competition (d) parasitism 32. In which of the following population, genetic drift operates: (a) island (b) smaller (c) larger (d) continental 33. The driving force of an ecosystem is: (a) producers (b) biomass (c) solar energy (d) grassland 34. The correct match of atmospheric gases is (a) nitrogen-0.03%, oxygen-78.08%, argon-0.93% and CO2-20.95% (b) nitrogen-78.08%, oxygen-20.95%, argon-0.03% and CO2-0.03% (c) nitrogen-0.03%, oxygen-78.08%, argon-20.95% and CO2-0.93% (d) nitrogen-78.08%, oxygen-20.95%, argon-0.93% and CO2-0.03% 35. Zooplanktons are: (a) parasites (b) primary producers (c) primary consumers (d) primary decomposers 36. Photochemical smog formed in congested metropolitan cities mainly consists of: (a) hydrocarbons, ozone and SOx (b) hydrocarbons, SO2 and CO2 (c) smoke, peroxyacetyl nitrate and SO2 (d) ozone, peroxyacetyl nitrate and NOx 37. Acid rain is due to increase in atmospheric concentration of: (a) ozone (b) CO2 and CO (c) SO3 and CO (d) SO2 and nitrogen oxide 38. The true statement about 'green-house effect' is that it Is caused by (a) CO2 only (b) SO2 only (c) CO2 and SO2 (d) CO2, CFC, CH4 and NO2 gases 39. Which of the following statement about viruses is correct? (a) viruses are obligate parasites (b) viruses contain both RNA and DNA (c) nucleic acid of viruses is known as capsid (d) viruses possess their own metabolic system 40. The virus, that infects bacteria, are made up of: (a) protein only (b) RNA and protein (c) DNA and lipid (d) DNA and protein 41. The first transgenic crop was: (a) pea (b) flax (c) tobacco (d) cotton 42. One of the major difficulties in the biological control of insect pests is the: (a) practical difficulty of introducing the predator to specific areas (b) method is less effective as compared with the use of insecticides (c) predator does not always survive when transferred to a new environment (d) predator develops a preference to other diets arid may itself become a pest 43 Casparian strips are present in (a) cortex (b) epidermis (c) endodermis (d) hypodermis 44. The function of microvilli is: (a) cellular movement (b) specilized uptake a macro molecules (c) increase in surface area.for absorption (d) extensive movement of substances over cell surface 45. Chemiosmotic theory of ATP synthesis, in the chloroplast and mitochondria, is based on: (a) proton gradient (b) membrane potential (c) accumulation of K ions (d) accumulation of Na ions 46. The plants respond to photoperiods due to the presence of: (a) enzymes (b) stomatas (c) phytochromes (d) phytohormones 47. Meaophyll cells, which librate malic acid at night time, are: (a) C4-plants (b) C3-plants . (c) C,-plants (d) C,-plants 48. Photorespiration in C3-pIants starts from: (a) glycine (b) glycerate (c). Phosphoglycolate (d) phosphoglycerate
49. Anaerobic respiration is also called: (a) restoration (b) fragmentation (c) multiplication (d) fermentation 50. Biological oxidation in Kreb's cycle involves: (a) O2 . . (b) N2 (c) CO2 (d) SO2 51. The name of process of aerobic respiration, in which energy in provided in steps in electron transport chain, is (a) EMP-pathway (b) decarboxylation (c) photophosphorylation (d) oxidative phosphorylation 52. Asthma is caused due to: (a) infection of lungs (b) infection of trachea (c) bleeding into pleural cavity (d) spasm in bronchial muscles 53. A person breathing normally at rest takes in and expels approximately half a litre of air during each respiratory cycle. This is called: (a) tidal volume (b) vital capacity (c) inspiratory reserve volume (d) expiratory reserve volume 54. The Largest quantity of air that can be expired, after maximal inspiration, is called: (a) tidal volume (b) vital capacity (c) residual volume (d) total lung volume 55. Rate of heart beat is determined by (a) AV-node (b) SA-node (c) Purkinje fibres (d) papillary muscles 56. The first heart sound is produced when (a) diastole begins (b) semilunar valve close quickly (c) interventricular pressure decreases (d) bicuspid and tricuspid valve close quickly 57. Which of the following layer of heart wall consists cardiac muscles? (a) endocardium (b) myocardium (c) epicardium (d) all of these 58. If heart beats 75 beats/min then what is time for cardiac cycle? (a) 0.5 sec (b) 0.8 sec (c) 1 sec (d) 1.5 sec 59. Blood pressure increases and heart rate decreases in response to: (a) exercise (b) haemorrage (c) exposure to high altitude (d) increased intracranial pressure 60. 'P' wave of ECG occurs before the: (a) onset of ventricular ejection (b) end of arterial contraction (c) begining of atrial contraction (d) none of these 61. Liver in our body stores: (a) vitamin-A (b) vitamin-D (c) vitamin-B12 (d) all of these 62. Secretin hormone is secreted by: (a) liver (b) pancreas (c) intestine (d) Brunner's glands 63. The contraction of gall bladder is due to: (a) gastrin (b) secretin (c) cnterogastrone (d) choiecystokinin 64. Which of the following is the character of the bile juice? (a) it has trypsin (b) it has no enzyme (c) it has cnterogastrone (d) it has tripophnomide 65. Average pH of human urine is: (a) 60 (b) 90 (c) 30 (d) 70 66. Cells present is the inner lining of kidneys are: (a) podocytes (b) choanocytes (c) pinocytes (d) nephrocytes 67. Which of the following is impermeable to water? (a) vertical limbjof loop of Henle (b) descending limb of loop of Henle (c) ascending limb of loop of Henle (d) both V and 'b' 68. Ducts of Bellini are present in: (a) liver (b) kidney (c) intestive (d) medulla oblongata 69. Human brain has greater development of: (a) cerebrum (b) cerebellum (c) optic lobes (d) medulla oblongata 70. The 'end organs of Raffini' are receptors of: (a) heat (b) cold (c) pressure (d) touch 71. Which of the following part of human brain is associated with integration of sympathetic and parasympathetic activities? (a) cerebrum (b) neopallium (c) hypothalamus (d) medulla oblongata 72. The unidirectional transmission of a nerve impulse through nerve fibre is due to (a) neurotransmitters are released by axon endings (b) neurotransmitters which are released by dendrites (c) nerve fibre which is insulated by a medullary sheath (d) sodium pump which starts operating into the nerve fibre 73. In the myopia eye defect, the rays of light: (a) do not enter the eye at all (b) meet at a focus in front of the retina (c) come to a focus at back of retina (d) come to a focus in between retina and iris 74. Sensory receptor of warmth located principally at the tip of fingers in known as: (a) Weber's organ (b) organ of Giraldes (c) Ruffini's corpuscles (d) organ of Zuckerkandl 75. Hormones secreted by pancreas are: (a) ACTH (b) oxytocin (c) LH and FSH (d) insulin and glucagon 76. Neurohypophysis secretes: (a) ADH and oxytocin (b) oxytocin and estrogen (c) vasopression and GH (d) vasopressin and estrogen 77. Secretion of androgens by testis is regulated by: (a) LTH (b) FSH (c) ICSH (d) oxytocin 78. Pancreatic duct of a healthy dog is blocked. Which of the functions of pancreas will not be affected? (a) protein digestion (b) carbohydrate digestion (c) neutralization of chime (d) maintenance of normal blood sugar level 79. Physiologically active thyroxine exists in which of the following form? (a) unbound (b) bound to albumin (c) bound to globulin (d) all of these 80. A flower characterised by monadelphous tubular stamens belongs to: (a) Solanaceae (b) Liliaceae (c) Malvaceae (d) Brassicaceae 81. In Musa, inflorescence is: (a) spadix (b) corymb (c) capitulum (d) polychasial cyme 82. The formation of gametophyte, from sporophyte, without spore formation or without meiosis is known as: (a) apospory (b) apogamy (c) parthenogenesis (d) none of these 83. Ancmophillous flowers have: (a) sessile stigma (b) small and smooth stigma (c) coloured-flower (d) large and feathery stigma 84. In oogamy, fertilization involves (a) a small non-motile, female gamete and a large motile male gamete (b) a large motile female gamete and a small non-motile male gamete (c) a large non-motile female gamete and small motile male gamete (d) a large non-motile female gamete and a small non-motile male gamete 85. In angiosperms, triple, fusion results in the formation of: (a) zygotic nucleus (b) polar nucleus (c) secondary nucleus (d) primary endosperm nucleus 86. During a woman's life time, she produces about: (a) 40-50 eggs (b) 300-350 eggs (c) 400-500 eggs (d) 750-850 eggs 87. The production and maturation of sperm in testis is known as: (a) oogenesis (b) sporogenesis (c) gametogenesis (d) spermatogenesis 88. The phase of menstrual cycle is humans that lasts for 7-8 days, is: (a) menstruation (b) luteal phase (c) ovulatory phase (d) follicular phase 89. Which one of the following statement with regard to the embryonic development in humans is correct? (a) cleavage division results in a hollow ball of cells called morula (b) cleavage in mammalian ova is unequal holoblastic and horizontal (c) rearrangement of blastomeres, acentral cavity is formed inside the morula (d) cleavage divisions bring about considerable increase in the mass of protoplasm 90. The most accepted theory of ageing is (a) less RBC in blood (b) thymus gland becomes non-functional (c) brain cells die with ageing (d) all of these 91. Which of the following is not immunised by triple, antigen? (a) typhoid (b) tetanus (c) diphtheria (d) whooping cough 92. A person with the sex chromosomes XXY suffers from; (a) Down's syndrome (b) Turner's syndrome (c) gynandromorphism (d) Klinefelter's syndrome 93. Which of the following represents Klinefelter's syndrome? (a) XX (b) XO (c) XY (d) XXY
94. Which is the closest pet of human being? (a) cat (b) cow (d) dog (d) buffalo 95. The bacterial disease which is a found in chickens, is: (a) rickets (b) ranikhets (c) fowl fox (d) fowl cholera 96. Which of the following is viral disease in silkworm? (a) flacherie (b) grasserie (c) muscardine (d) pebrinc 97. Which of the following is not the example of marine fishes? (a) Labeo (b) Mugil (c) Hilsa (d) Sardines
98. Reproducing new plants by cells, instead of seeds, is known as: (a) mutation (b) antibiotics (c) biofertilizer (d) tissue culture 99. Creosote is used to prevent: (a) rusts of wheat (b) dry rot of wood (c) loose smut of oats (d) brown rust of barley 100. Which of the following insecticide is obtained from the roots of Denis elliptica? (a) cinerin (b) nicotine (c) rotenone (d) pyrethrum