AIPMT Biology 1995

aipmt–Past papers BIOLOGY- UNSOLVED PAPER - 1995

SECTION – I (Total Marks : 100) Single Correct Answer Type There are five parts in this question. Four choices are given for each part and one of them is correct. Indicate you choice of the correct answer for each part in your answer-book by writing the letter (a), (b), (c) or (d) whichever is appropriate

01 Problem One of the major difficulties in the biological control of insect pest is that The method is less effective as compared with the use of insecticides The practical difficulty of introducing the predator to specified areas The predator develops a preference to other diets and may itself become a pest The predator does not always survive when transferred to a new environment

Problem 02 Nicotine acts acts as a stimulant, because it mimics the effect of Testosterone Dopamine Thyroxin Acetylcholine

Problem 03 The transgenic animals are those which have Foreign RNA in all its cells Foreign DNA in some of its cells Foreign DNA in all its cells Both ‘a’ and ‘b’

Problem 04 Antic done is an unpaired triplet of bases in an exposed position t-RNA m-RNA r-RNA both ‘b’ and ‘c’

Problem 05 In India, human population is heavily weighed towards the younger age groups as a results of Short life span of many individuals and high birth rate Long life span of many individuals and high birth rate Short life span of many individuals and low birth rate Long life span of many individuals and low birth rate.

Problem 06 The citric acid is produced by Candida utilis Acetobacter suboxydans Aspergillus niger Streptococcus lsctis

Problem 07 The blood cancer is known as Haemolysis Haemophilia Leukaemia Thrombosis

Problem 08 Antigens are present Inside the cytoplasm On nuclear membrane inside the nucleus On cell surface

Problem 09 Which one of the following pairs is not correctly matched Syphilis trichuris trichicura Aleeping sickness typanosoma gambiense Dengue fever- arbovirus Plague yersinia pesis

Problem 10 Which one the following is the new world spice that has become essential part of Indian cuisine? Red pepper Black pepper Ginger Cardamom

Problem 11 Which one of the following disease is due to an allergic reaction Enteric fever Skin cancer Goiter Hay fever

Problem 12 The silkworm silk is the product of Salivary gland of the larva Salivary gland of the adult Cuticle of the larva Cuticle of the adult

Problem 13 The concept that population tends to increase geometrically while food supply increases arithmetically’ was put forward by Thomas Malthus Charles Darwin Stuart Mill Adam Smith.

Problem 14 The vitamin C or ascorbic acid prevents Scurvy Antibody synthesis Rickets Pellagra.

Problem 15 The rotenone is A natural herbicide A natural insecticide An insect hormone A bioherbicide.

Problem 16 ‘Nothing lives for ever, but life continues’. What does it mean? Older die but new are produced due to reproduction Nothing can produce without death Death has nothing to do with the continuation of life Parthenogenesis is must for sexual reproduction.

Problem 17 An abnormal human male phenotype involving an extra X-chromosome (XXY) is a case of Edward’s syndrome Klinefelter’s syndrome Intersex Down’s syndrome.

Problem 18 An environmental agent, which triggers transcription from an operant, is a Depressor Controlling element Regulator Inducer.

Problem 19 The phenomenon, in which an allele of one gene suppresses the activity of an allele of another gene, is known as Epistasis Dominance Suppression Inactivation.

Problem 20 The point, at which polytene chromosome appear to be attached together, is called Centromere Chromomere Chromocentre Centriole.

Problem 21 In split genes, the coding sequences are called Exons Cistrons Introns Operons.

Problem 22 The polytene chromosomes were discovered for the first time in Drosophila Musca domestica Chironomus Musca nebula.

Problem 23 When two genetic loci produce identical phenotypes in is and trans position, they are considered to be Multiple alleles The parts of same gene Pseudoalleles Different genes.

Problem 24 The lacoperon is an example of Repressible operon Overlapping genes Arabinoseoperon Inducible operon.

Problem 25 Each chromosome at the anaphase stage of a bone marrow cell in our body has Two chromatids Several chromatids No chromatids Only one chromatid.

Problem 26 If the DNA codons are ATG ATGATG and a cytosine base is inserted at the beginning, then which of the following will result? CAT GAT GATG A non-sense mutation C ATG ATGATG CA TGA TGA TG.

Problem 27 Barr body in mammals represents All the heterochromatin in male and female cells The Y-chromosome in somatic cells of male All the heterochromatin in female cells One of the two X-chromosomes in somatic cells of females.

Problem 28 The restriction enzymes are used in genetic engineering. Because They can cut DNA at specific base sequence They are nucleases that cut DNA at variable sites They can degrade harmful proteins They can join different DNA fragments.

Problem 29 The wild type E. coli cells are growing in normal medium with glucose. They are transferred to medium containing only lactose as sugar. Which of the following changes take place? The lacoperon is induced E. coli cells stop dividing The lacoperon is repressed All Operon are induced

Problem 30 If the sequence of bases in DNA is ATTCGATG, then the sequence of bases in its transcript will be GUAGCUUA AUUCGAUG CAUCGAAU UAAGCUAC.

Problem 31 At high altitude, the RBCs in the human blood will Increase in number Decrease in number Increase in size Decrease in size.

Problem 32 When huge amount of sewage is dumped into a river, its B.O.D. will Slightly decrease Remain unchanged Increase Decrease.

Problem 33 Which of the following radioactive isotopes is used in the detection of thyroid cancer? Uranium-238 Phosphorus-131 Iodine-131 Carbon-14.

Problem 34 If we completely remove the decomposers from an ecosystem, its functioning will be adversely affected, because Mineral movement will be blocked The rate of decomposition will be very high Energy flow will be blocked Herbivores will not receive solar energy.

Problem 35 In a biotic community, the primary consumers are Detritivores Herbivores Carnivores Omnivores.

Problem 36 The abundance of a species population, within its habitat, is called Relative density Regional density Absolute density Niche density.

Problem 37 Which of the following causes plague? Trichinellaspiralis Salmonella typhimurum Yersiniapestis Leishmaniadonovani.

Problem 38 Identify the correct match between tiger reserve an its state Manas – Assam Corbett – Madhya Pradesh Bandipur – Tamil Nadu Palanau – Orissa.

Problem 39 The TajMahal is threatened due to the effect of Oxygen Hydrogen Chlorine Sulphur-dioxide.

Problem 40 In Minamata Bay japan the animals which remained free Minamata disease, are Dogs Cats Pigs Rabbits.

Problem 41 Which of the following pairs is a sedimentary type of biogeochemical cycle? Phosphorus and nitrogen Phosphorus and nitrogen Oxygen and nitrogen Phosphorus and carbon dioxide.

Problem 42 The toxic effect of carbon monoxide is due to its greater affinity for haemoglobin as compared to oxygen approximately by 200 times 1000 times 2 times 20 times

Problem 43 Which of the following isotopes is most dangerous to Homo sapiens? Phosphorus – 32 Strontium-90 Cesium –137 Iodine –131

Problem 44 Which of the following is the most stable ecosystem? Mountain Ocean Forest Desert.

Problem 45 The primary succession refers to the development of communities on Forest clearing after devastating fire Newly-exposed habitat with no record of earlier vegetation Freshly cleared crop field Pond, freshly filled with water after a dry phase.

Problem 46 A dental disease characterized by mottling of teeth is due to the presence of certain chemical element in drinking water. Which of the following is that element? Fluorine Boron Mercury Chlorine.

Problem 47 Which of the following is the main factor of desertification? Over-grazing Tourism Irrigated agriculture All of these

Problem 48 Which one of the following pairs is correctly matched? Parasitism – intra – specific relationship Uricotelism – aquatic habitat Excessive perspiration - xeric adaptation Stream lined body – aquatic adaptation.

Problem 49 The estrous cycle is a characteristic of Human females only Mammalian females other than primates Human males only Mammalian males other than primates.

Problem 50 The carbon dioxide is transported via blood to lungs mostly In combination with haemoglobin only Dissolved in blood plasma In the form of carbonic acid only As carbaminohaemoglobin and as carbonic acid.

Problem 51 The mammalian corpus luteum produces Luteotropic hormone Luteinizing hormone Estrogen Progesteron.

Problem 52 According to the accepted concept of hormone action, if receptor molecules are removed from target organs, then the target organ will Continue to respond to the hormone without any difference Not respond to the hormone Continue to respond to the hormone but will require higher concentration Continue to respond to the hormone but in the opposite way.

Problem 53 In veins, valves are present of cheek backward flow of blood flowing at Atmospheric pressure High pressure Low pressure All of these.

Problem 54 The ventilation movements of the lungs in mammals are governed by Muscular walls of lung Diaphragm Coastal muscles Both ‘b’ and ‘c’.

Problem 55 Although much CO2 is carried in blood, yet blood does not become acidic, because CO2 is continuously diffused through the tissues and is not allowed to accumlate In CO2 transport, blood buffers play an important role CO2 is absorbed by the leucocytes CO2 combines with water to form H2CO3 which is neutralized by NaCO3.

Problem 56 The lymph serves to Return the interstitial fluid to the blood Return the WBCs and RBcs to the lymph nodes Transport CO2 to the lungs Transport O2 to the brain.

Problem 57 In an egg, the type of cleavage is determined by The amount and distribution of yolk The number of egg membranes The shape and size of the sperm The size and location of the nucleus

Problem 58 In an egg, the type of cleavage is determined by The amount and distribution of yolk The number of egg membranes The shape and size of the sperm The size and location of the nucleus

Problem 59 The number of floating ribs, in the human body, is 3 pairs 2 pairs 6 pairs 5 pairs.

Problem 60 The sympathetic nerves, in mammals, arise from Sacral nerves 3rd, 7th 9th and 10th cranial nerves thoraco-lumbar nerves cervical nerves.

Problem 61 A polysaccharide, which is synthesized and stored in liver cells, is Arabinose Glycogen Lactose Galactose.

Problem 62 The desmosomes are concerned with Cell division Cell adherence Cytolysis Cellular excretion.

Problem 63 The correct route through which pulse-making impulse travels in the heart is SA node -> Purkinje fibres -> bundle of His -> AV node -> hear muscles SA node -> AV node -> bundle of His -> Purkinje fibres -> heart muscles AV node -> bundle of His -> SA node -> Purkinje fibres -> heart muscles AV node -> SA node -> Purkinje fibres -> bundle of His -> heart muscles.

Problem 64 The haemorrhagic disease of new born is caused due to the deficiency of Vitamin K Vitamin B12 Vitamin A Vitamin B1.

Problem 65 The enzyme enterokinase helps in the conversion of Caesinogen into casein Trypsinogen into trypsin Pepsinogen into pepsin Proteins into polypeptides.

Problem 66 The closure of lid of pitcher in pitcher plant, is due to Paratonic movement Autonomous movement Turgor movement Tropic movement.

Problem 67 The movement of water, from one cell of cortex to adjacent one in roots, is due to Accumulation of inorganic salts in the cells Accumulation of organic compounds in the cells Water potential gradient Chemical potential gradient.

Problem 68 Which of the following element plays an important role in biological nitrogen fixation ? Copper Molybdenum Zinc Manganes.

Problem 69 The polyembryony commonly occurs in Tomato Potato Citrus Turmeric.

Problem 70 The pigment, that absorbs red and far red light in plants, is Phytochrome Carotene Xanthophyll Cytochrome

Problem 71 The CO2 fixation during C4 pathway occurs in the chloroplast of Guard cells Bundle sheathe cells Mesophyll cells Spongy parenchyma.

Problem 72 The twinning of tendrils around a support is a good example of Phototropism chemotropism Nastic movements Thigmotropism.

Problem 73 The change of the lighter – coloured variety of peppered moth (Bistonbetularia) to its darker variety (Bistoncarbonaria ) is due to Mutation Regeneration Genetic isolation Temporal isolation.

Problem 74 In an angiosperm, how many microspore mother cells are required to produce 100 pollen grains? 75 100 25 50.

Problem 75 The homologous organs are those that show similarity in Appearance Function Origin Size.

Problem 76 Which of the following is the matching pair of a sanctuary and its main protected wild animal? Kaziranga - Musk deer Gir – Lion Sunderban - Rhino All of these.

Problem 77 The organisms attached to the substratum, generally, possess One single opening of the digestive canal Cilia on the surface to create water current Radial symmetry Asymmetrical body.

Problem 78 The closely related morphologically similar sympatric populations, but reproductively isolated, are designated as Clones Sibling species Clines Demes.

Problem 79 The presence of gill slits, in the embryos of all vertebrates, supports the theory of Metamorphosis Biogenesis Organic evolution Recapitulation.

Problem 80 Two zoogeographical regions, separated by high mountain ranges, are Nearctic and Palearctic Neotropical and Ethiopian Oriental and Australian Palaearctic and Oriental.

Problem 81 The function of contractile vacuole, in protozoa, is Osmoregulation Reproduction Locomotion Digestion of food.

Problem 82 Besides annelida and arthropoda, the metamerism is exhibited by Mollusca Acanthocephala Cestoda Chordata.

Problem 83 The most striking example of point mutation is found in a disease called Down’s syndrome Sickle cell anaemia Thalassemia Night blindness.

Problem 84 Which era is dubbed as the age of prokaryotic microbes? Precambrian Phanerozoic Archean Proterozoic.

Problem 85 A well developed archegonium with neck consisting of 4-6 rows and neck canal cells, characterizes Gymnoperms and flowering plants Pteridophytes and gymnosperms Gymnosperms only Bryophytes and pteridophytes.

Problem 86 The sexual reproduction is absent in Spirogyra Nostoc Ulothrix Volvox.

Problem 87 The anthesis is a phenomenon, which refers to Development of anthers Opening of flower bud Stigma receptors All of these.

Problem 88 For the first time, the bacteria were observed by Robert Koch A.V. Leeuwenhoek W.H. Stanley Louis Pasteur.

Problem 89 The plant body of moss (Fun aria) is Completely sporophyte Predominantly gametophyte with sporophyte Completely gametophyte Predominantly sporophyte with gametophyte.

Problem 90 The black rest of wheat is a fungal disease caused by Albugo candida Puccinia graminis tritici Melampsora lini Clevicepspurpurea.

Problem 91 The pyrenoids are made up of Proteinaceous centre and starchy sheath Core of nucleic acid surrounded by protein sheath Core of protein surrounded by fatty sheath Core of starch surrounded by sheath of protein.

Problem 92 A large number of organic compounds can be decomposed by Azotobacter Chemolithotrophs Mycoplasma Pseudomonas.

Problem 93 The tailed Bacteriophages are Motile on surface of bacteria Non-motile Motile on surface of plant leaves Actively motile in water.

Problem 94 The smut of maize is caused by Ustilago avenae Ustilago nuda Ustilago hordei Ustilagomaydis.

Problem 95 Which of the following organism possesses characteristics of a plant and an animal? Euglena Paramecium Bacteria Mycoplasma.

Problem 96 The primary acceptor, during CO2 fixation in C3 plants, is Phosphoenolpuruvate (PEP) Ribulose 1, 5-diphosphate (RuDP) Phosphoglyceric acid (PGA) Ribulosemonophosphate (RMP).

Problem 97 The organism, used for alcohol fermentation, is Aepergillus Saccharomyces Pseudomonas Penicillium.

Problem 98 Agar is commercially obtained from Red algae Blue-green algae Brown algae Green algae.

Problem 99 The prlaryotic flagella possess Helically arranged protein molecule “ 9 + 2 “ membrane enclosed structure unit membrane enclosed fibre protein membrane enclosed fibre.

Problem 100 The an thesis is a phenomenon, which refers to Development of anthers Opening of flower bud Stigma receptors All of these.

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AIPMT Biology 1995

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