AIPMT Biology 1994

aipmt–Past papers BIOLOGY- UNSOLVED PAPER - 1994

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 Which among the following is likely to have the highest levels of D.D.T. depositions in its body? Sea gull Phytoplankton Eel Crab

Problem 02 Which one of the following gasses contributes maximum to the ‘green house effect’ on the earth? Carbon dioxide Chlorofluoro carbon Freon Methane

Problem 03 The dominant second trophic level, in a lake ecosystem, is Phytoplankton Zooplankton Benthos Plankton

Problem 04 Sounds above what level are considered hazardous noise pollution? Above 80 dB Above 30 dB Above 150 dB Above 120 dB

Problem 05 Which of the following species does not have the ability to fix atmospheric nitrogen? Azjitibactor Anavaena Nostoc Spirogyra

Problem 06 The most important human activity, leading to the extinction of wildlife, is pollution of air and water hunting for valuable wildlife products introduction of alien species alteration and destruction of the natural habitats

Problem 07 if excess water passes out from the tissue without being restored by the kidneys, the cells would burst open and die take water from the plasma not be affected at all Shriver and die

Problem 08 Which one of the four parts mentioned below does not constitute of part of single uriniferous tubule? Distal convoluted tubule Collecting duct Bowman’s capsule Loop of Henley

Problem 09 The pace setter in the heart is called Sino-atrial node (SAN) Atrio-ventricular node (AVN) Purkinje fibers Papillary muscle

Problem 10 Which of the following does not have an open circulatory system? Frog’s tadpole Prawn Chelifer Cockroach

Problem 11 In man and mammals, air passes from outside into the lungs through Nasal cavity, larynx, pharynx, trachea, bronchi, alveoli Nasal cavity, larynx, pharynx, trachea, bronchioles, alveoli Nasal cavity, pharynx, larynx, trachea, bronchioles, bronchi, alveoli Nasal cavity pharynx, larynx, trachea, bronchi, bronchioles, alveoli

Problem 12 Which of the following is correct pairing of site of action and substrate of rennin? Mouth-starch Small intestine-protein Stomach-casein Stomach-fat

Problem 13 What is true about cleavage in the fertilized egg in humans? It starts while the egg is in fallopian tube It starts when the egg reaches uterus It is meroblastic It is identical to the normal mitosis

Problem 14 The heart sound ‘dup’ is produced when Mitral valve is closed Semi-lunar valves at the base of aorta get closed Tricuspid valve is opened Mitral valve is opened

Problem 15 Two examples in which the nitrogenous wastes are excreted from body in the form of uric acid are Birds and lizards Frogs and cartilaginous fishes Insects and bony fishes Mammals and mollusk

Problem 16 The respiratory center, which regulates respiration, is located in Cerebellum Medulla oblongata Cerebral peduncle The vague nerve

Problem 17 Prolonged deficiency of nicotinic and causes Pellagra Xerophthalmia Osteomalacia Anaemia

Problem 18 The extra embryonic membranes of the mammalian embryo are derived from Trophoblast Inner cell mass Formative cells Follicle cells

Problem 19 In the 28 day human ovarian cycle, the ovulation takes place typically on Day 14 of the cycle Day 28 of the cycle Day 1 of the cycle Day 5 of the cycle

Problem 20 The immediate cause of induction of ovulation in human female is the large plasma surge of LH FSH Progesterone Estrodiol

Problem 21 The type of joint between the human skull bones is called Cartilaginous joint Hinge joint Fibrous joint Synovial joint

Problem 22 Which of the following components is a part of the pectoral girdle? Sternum Acetabulum Glenoid cavity Ilium

Problem 23 Which of the following is the function of enterogastrone? It inhibits the secretion of gastric juice It stimulates the secretion of digestive juices in the stomach It stimulates the flow of pancreatic juice It regulates the flow of bile

Problem 24 An epithelial tissue which has thin flat cells, arranged edge to so as to appear like closely packed tiles, is found to be present at Outer surface of ovary Inner lining of fallopian tube Inner lining of stomach Inner lining of cheeks

Problem 25 A plant bears fruit, has a column of vascular tissue and a tap root system. This plant is a Angiosperm and dicot Gymnosperm and dicot Angiosperm and monocot Gymnosperm and monocot

Problem 26 Haploid plants can be obtained by culturing Pollen grains Root tips Young leaves Endosperm

Problem 27 Besides giving out secretory vesicles, the golgi apparatus is also concerned with the formation of Lysosomes Plastids Grana of chloroplasts Cell plates after cell division in plants.

Problem 28 Which one of the following changes involved is irrelevant, in the evolution of man? Perfection of hand for tool making Change of diet from hard nuts and hard roots to soft food Loss of tail Increase in the ability to communicate with others and develop community behavior

Problem 29 Which of the following evidences does not favour the Lamarckian concept of inheritance of acquired characters? Lack of pigment in cave-dwelling animals Melanization in peppered moth Absence of limbs in snakes Presence of webbed toes in aquatic birds.

Problem 30 Coolum derived from blastocoels is known as Pseudocoelom Schizocoel Haemocoel Enterocoelom

Problem 31 A common characteristic of al vertebrates without exception is The division of body into head, neck, trunk and tail Their body covered with an exoskeleton The possession of two pairs of functional appendages The presence of well-developed skull

Problem 32 Tube feet are the characteristic structures of Starfish Jellyfish Crayfish Cuttlefish

Problem 33 Among the following organisms point out a completely non-parasitic form Tape worm Mosquito Sea anemone Leech

Problem 34 Which of the following is an example of platy helminthes? Plasmodium Schistosoma Trypanosoma Wuchereria

Problem 35 Radial symmetry is, usually, exhibited in animals which Are attached to the substratum Have one opening of alimentary canal Live in water Have ciliary mode of feeding

Problem 36 One of the special characters of coelenterate only is the occurrence of Polymorphism Flame cells Hermaphrodites Nematocysts.

Problem 37 There are special proteins that help to open up DNA double helix in front of the replication fork. These proteins are DNA ligase DNA toposiomerase I DNA gyrase DNA polymerase I

Problem 38 There are special proteins that help to open up DNA double helix in front of the replication fork. These proteins are DNA ligase DNA toposiomerase I DNA gyrase DNA polymerase I

Problem 39 Initiation codon in eukaryotes is GAU AGU AUG UAG.

Problem 40 The earliest fossil form, in the phylogeny of horse, is Equus Mesohippus Eohippus Merychippus

Problem 41 Which of the following is pair of homologous organs? Plectoral fin of rohu and fore-limb of horse Wings of grasshopper and wings of crow Lungs of rabbit and gills of rohu Wings of bat and wings of butterfly

Problem 42 Plants, but not animals, can convert fatty acids to sugars by a series of reactions called Photosynthesis Kreb’s cycle Glycolysis Glyoxylate cycle.

Problem 43 The inner membrane of the mitochondria is, usually, highly convoluted forming a series of in foldings known as Tylakoids Lamellae Cristae Grana

Problem 44 In a somatic cell cycle, DNA synthesis takes place in G1 phase Prophase of mitosis S-phase G2 phase.

Problem 45 Which one of the following organelles is located near the nucleus and contains a collection of flattened membrane bound cisternae? Nucleolus Mitochondrion Centriole Golgi apparatus.

Problem 46 Centro mere is required for Replication of DNA Chromosome segregation Pole ward movement of chromosomes Cytoplasm cleavage.

Problem 47 Which of the following represents the best stage to view the shape, size and number of chromosomes? Prophase Metaphase Interphase Telophase.

Problem 48 The first phase in the breakdown of glucose, in animal cell, is Fermenation Kerbl’s cycle Glycolysis E.T.S

Problem 49 In protein synthesis, the polymerization of amino acids involves three steps. Which one of the following is not involved in the polymerization of protein? Termination Initiation Elongation Transcription.

Problem 50 In mitochondria, cristae act as sites for Protein synthesis Phosphorylation of flavoproteins Breakdown of macromolecules Oxidation – reduction reaction

Problem 51 A red blood cell was kept in a solution for a few minutes, where is got burst. The solution taken was Hypotonic Conce. Sugar solution Isotonic Hypertonic

Problem 52 Which of the following organelles contain enzymes that have digestive action? Ribosomes Polysomes Plastids Lysosomes.

Problem 53 The four elements that make up 99% of all elements found in a living system are C, H, O and P C, N, O and P H, O, C and N C, H, O and S

Problem 54 When yeast ferments glucose, the products obtained are Ethanol and CO2 Methanol and CO2 Ethanol and water Water and CO2

Problem 55 Which of the following organelles is related with genetic engineering? Mitochondria Plasmids Golgi bodies Lysosomes

Problem 56 Organisms, which fix atmospheric nitrogen in soil, fall under the category of Bacteria Green algae Soil fungi mosses

Problem 57 The colour blindness is more likely to occur in males than in females because The Y-chromosome of males have the genes for distinguishing colors Genes for characters are located on the sex-chromosomes The trait is dominant in males and recessive in females None of these.

Problem 58 A cell-coded protein that is formed in response to infection, with most animal viruses, is called Histone Antibody Mterferon Antigen

Problem 59 Which of the following statements is correct with reference to a test tube baby? Fertilization of the egg is effected outside the body; the fertilized egg then placed in the womb of the mother where the gestation is completed Fertilization of the egg is effected in the female genital tract. It is then taken out and grown in a large test tube A prematurely born baby is reared in an incubator Fertilization of the egg and growth of the embryo are affected in a large test tube.

Problem 60 Albinism is a congenital disorder resulting from the lack of the enzyme Tyrosinase Xanthine oxidase Catalase Fructokinase

Problem 61 A disease caused by eating fish contaminated by industrial waste, containing mercury compounds, is called Osteosclerosis Hashimoto”soxidase Bright”s disease Minimata disease.

Problem 62 Which one of the following is correctly matches a sexually transmitted disease with its pathogen? Syphilis-Treponema pallidium Gobirrhoea-Entamoeba histolytica Urethritis-Bacillus anthracis Softsore-Bacillus brevis.

Problem 63 Silk is produced by Adult moth Cocoon Larva Both (a) and (c).

Problem 64 Which among the following is the real product of the honey bee? Honey Propolis Pollen Bee wax

Problem 65 The main reason why antibodies could not solve all the problems of bacteria mediated disease is Decreased efficiency of the immune system Insensitivity of the individual following prolonged exposure to antibiotics Development of mutant strains resistant to antibodies Inactivation of antibiotics by bacterial enzymes

Problem 66 Tobacco mosaic virus (TMV) genes are Single stranded RNA Double stranded DNA Proteinaceous Double stranded RNA.

Problem 67 Biological control of agricultural pests, unlike chemical control, is Self perpetuating Polluting Very expensive Toxic.

Problem 68 Calcium deficiency in the body occurs in the absence of Vitamin C Vitamin D Vitamin B Vitamin E

Problem 69 In cheese manufacture, the microorganisms are important for The ripening only The souring of milk only The development of resistance to spoilage only Both the souring and the ripening processes.

Problem 70 Lac operon’ in E. coli, is induced by ‘I’ gene promoter gene -galactosidase Lactose.

Problem 71 Transduction in bacteria is mediated by Plasmid vectors Phage vectors Cosmos F-factors.

Problem 72 Which one of the following statements is correct? Legumes fix nitrogen only through the specialized bacteria that live in their roots Legumes fix nitrogen independently of the specialized bacteria that live in their roots Legumes fix nitrogen only through specialized bacteria that live in their leaves Legumes are incapable of fixing nitrogen.

Problem 73 Which of the following necleotide sequences contains 4 pyrimidine bases? GATCAATGC GCUAGACAA UAGCGGUAA Both (b) and (c).

Problem 74 A child’s blood group is ‘O’. The parent’s blood groups cannot be A and B A and A AB and O B and O.

Problem 75 Which statement best explains the evolutionary advantage of meiosis? Meiosis is necessary for sexual reproduction Genetic recombination are possible from generation to generation Meiosis alternates with mitosis for generation to generation The same genetic system is passed on from generation to generation.

Problem 76 A metastatic cancerous tumor is termed’ sarcoma’ if the disorder is in Fibroblasts Circulatory system Immune system Epithelial cells.

Problem 77 Normally DNA molecule has A-T, G-C pairing. However, these owing to rearrangements called Frame-shift mutation Tautomerisational mutation Analog substitution Point mutation.

Problem 78 The genes, which remain confined to differential region of Y-chromosome, are Autosomal genes Holandric genes Completely sex-linked genes Mutant genes.

Problem 79 The process of mating of individuals, which are more closely related than the average of the population to which they belong, is called Heterosis Self breeding Inbreeding Hybridization.

Problem 80 The nuclease enzyme, which begins its attack from free and of a polynucleotide, is Polymerase Endonuclease Exonuclease Kinase.

Problem 81 The ultimate respiratory substrate, yielding maximum number of ATP molecules, is Glycogen Ketogenic amino acid Glucose Amylose.

Problem 82 Posions like cyanide inhibit Na+ efflux and K+ influx during cellular transport. This inhibitory effect is reversed by an injection of ATP. This demonstrates that ATP is the carrier protein in the transport system Energy for Na+-K+ exchange pump comes from ATP ATP is hydrolyzed by ATPase to release energy Na+-K+ exchange pump operates in the cell.

Problem 83 During light reaction of photosynthesis, which of the following phenomenon is observed during cyclic phosphorylation as well as non-cyclic phosphorylation? Release of O2 Formation of ATP Formation NADPH Involvement of PSI and PSII pigment systems.

Problem 84 As a tree grows older, which of the following increases more rapidly in thickness? Heart wood Sap wood Phloem Cortex.

Problem 85 Caesarian strip occurs in a Endodermis Exodermises Epicycle Epidermis.

Problem 86 The 1992 Nobel Prize for medicine was awarded to Edmond H. Fischer and Edwin Jokers for their work concerning Reversible protein phosphorylation as a biological regulation mechanism Isolation of the gene for a human disease Human genome project Drug designing involving inhibition of DNA synthesis of the pathogen.

Problem 87 Precambrian is situated just behind apical meristem. Procambium gives rise to Primary vascular bundle Vascular cambium Cork cambium Both (a) and (b).

Problem 88 Which of the following pigments acts as a reaction centre durin photosynthesis? Carotene Phytochrome P700 Cytochrome.

Problem 89 Embryo sac represents Megaspore Mega gametophyte Megasporophyll Megagamete.

Problem 90 When pollen of a flower transferred to the stigma of another flower of the same plant, the pollination is referred to as Autogamy Geitonogamy Xenogamy Allogamy.

Problem 91 If the growing plant is decapitated, then Its growth stops Leaves become yellow and fall down Axillary buds are inactivated Axillary buds are activated.

Problem 92 The movement of auxin is largely Centripetal Basipetal Acropetal Both ‘a’ and ‘c’

Problem 93 Rickettsiae form a group under Viruses Bacteria Fungi A category between viruses and bacteria.

Problem 94 Hypanthodium is a specialized type of Fruit Inflorescence Thalamus Ovary.

Problem 95 In bryophytes Both generations are independent Gametophytes are dependent upon saprophytes Saprophytes complete their life cycle Saprophytes are dependent upon gametophytes.

Problem 96 In Pinus, the wing of the seed develops from Ovuliferous scale Integument Nucellus Bract.

Problem 97 In chlorophyceae, the mode of sexual reproduction is Isogamy Anisogamy Oogamy All of these.

Problem 98 The protests have Only free nucleic and aggregates Membrane bound nucleo proteins lying embedded in the cytoplasm Gene containing nucleoproteins condensed together in loose mass Nucleoprotein in direct contact with the rest of the cell substance.

Problem 99 Mycorrhiza exhibits the phenomenon of Parasitism Symbiosis Antagonism Endemism.

Problem 100 Many blue-green algae occur in thermal springs (hot water springs). The temperature tolerance of these algae have been attributed to their Mitochondrial structure Importance of homopolar bonds in their proteins Cell wall structure Modem cell organization.

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AIPMT Biology 1994

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