AIPMT Biology Past Paper Questions

aipmt–Past papers BIOLOGY- UNSOLVED PAPER - 1998

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 Albinism is known to be due to an autosomal recessive mutation. The first child of a couple with normal skin pigmentation was an albino. What is the probability that their second child will also be an albino? 50% 75% 100% 25%.

Problem 02 Human immune deficiency virus (HIV) has a protein coat and a genetic material which is Double stranded RNA Double stranded DNA Single stranded DNA Single stranded RNA.

Problem 03 Recombinant DNA is achieved by cleaving the pro-DNAs by Ligase Restriction endonulcease Primase Exonucleases.

Problem 04 In vertebrates lacteals are found in Oesophageous Ear Ileum Ischium.

Problem 05 Lactose is composed of Glucose + galactose Fructose + galactose Glucose + fructose Glucose+glucose.

Problem 06 How many different types of genetically different gametes will be produced by a heterozygous plant having the genotype AABbCc? Six Nine Two Four.

Problem 07 In desert grasslands, which type of animals are relatively more abundant? Aquatic Fossorial Diurnal Arboreal.

Problem 08 Crossing over in diploid organism is responsible for Segregation of alleles Recombination of linked alleles Dominance of genes Linkage between genes .

Problem 09 What is the major cause of diminishing wildlife number? Felling of trees Paucity of drinking water Cannibalism Habitat destruction.

Problem 10 Which one of the following cells, found in testes of rabbit sedretes male hormone? Epithelial cells Spermatocytes Leydig’s cell Sertoli cells.

Problem 11 A condition of failure of kidney to form urine is called Anuria Deamination Entropy None of these.

Problem 12 Transfer of genetic information from one bacterium to another in the transduction process is through Bacteriophages released from the donor bacterial strain Another bacterium having special organ for conjugation Physical contact between donor and recipient strains Conjugation between opposite strain bacterium.

Problem 13 The supersonic jets cause pollution by the thinning of O2 layer O3 layer CO2 layer SO2 layer.

Problem 14 Which of the following is not the main function of lymph glands? Forming RBC Destroying bacteria Forming WBC Forming antibodies.

Problem 15 Which of the following organism is used as indicator of water quality? Azospirillum Escherichia Biggiata Chlorella.

Problem 16 If there was no CO2 in the earth’s atmosphere, the temperature of earth’s surface would be Higher than the present Dependent on the amount of oxygen in the atmosphere Same as present Less than the present .

Problem 17 Two opposite forces operate in the growth and development of every population. One of them related to the ability to reproduce at a given rate .The force opposite to it is called Fecundity Environmental resistances Biotic control Mortality.

Problem 18 Plant such as Prosopic, Acacia and Capparis represent examples of tropical Deciduous forests Evergreen forests Grass lands Thron forests.

Problem 19 Carbon mono-oxide is a pollutant because Reacts with haemoglobin Makes nervous system inactive It reacts with O2 It inhibits glycolysis.

Problem 20 Which of the following is non-symbiotic biofertilizer ? Anabaena Rhizobium VAM Azotobacter.

Problem 21 Yeast (Saccharomycescerevisiae) is used in the industrial production of Tetracycline Ethanol Butanol Citric acid.

Problem 22 Transfusion tissue is present in the leaves of Pinus Dryopteris Cycas Both ‘a’ and ‘c’ .

Problem 23 The most important component of the oral contraceptive pills is Thyroxine Luteinizing hormone Progesterone Growth hormone.

Problem 24 Which one among the following chemicals is used for causing defoliation of forest trees? Malichydrazide 2, 4-D Amo-1618 Phosphon D.

Problem 25 The hormone which regulates the basal metabolism in our body is secreted from Adrenal cortex Pancreas Pituitary Thyroid.

Problem 26 Which of the following micro-organisms is used for production of citric acid in industries? Aspergillusniger Rhizopusnigricans Lactobacillus bulgaris Penicilliumcitrinum.

Problem 27 Phytochrome becomes active in Red light Green light Blue light None of these .

Problem 28 In mammals, histamine is secreted by Lymphocytes Mast cells Fibroblasts Histiocytes.

Problem 29 Total number of bones in the limb of a man is 24 30 14 21.

Problem 30 The reason for vegatatively reproducing crop plants to suit for maintaining hybrid vigour is that They are more resistant to disease Once a desired hybrid produced, no chances of losing it They can be easily propagated They have a longer life span.

Problem 31 The exchange of gases in the alveoli of the lungs takes place by Passive transport Active transport Osmosis Simple diffusion.

Problem 32 The role of double fertilization in angiosperms is to produce Cotyledons Endocarp Endosperm Integuments.

Problem 33 The contraction of gall bladder is due to Cholecystoinin Entergastrone Gastrin Secretion.

Problem 34 Loss of a X-chromosome in a particular cell, during its development, results into Gynandromorphs Diploid individual Triploid individual Both ‘b’ and ‘c’ .

Problem 35 The hormone that stimulates the stomach to secrete gastric juice is Enterokinase Enterogastrone Gastrin Renin.

Problem 36 When a single gene influences more than one trait it is called Pseudodominance Pleiotrophy Epistasis None of these .

Problem 37 One of the factors required for the maturation of erythrocytes is Vitamin B12 Vitamin C Vitamin D Vitamin A.

Problem 38 The layer of cells that secrete enamel of tooth is Osteoblast Odontoblast Dentoblast Ameloblast.

Problem 39 An adult human with average health has systolic and diastolic pressures as 120 mm Hg and 80 mm Hg 50 mm Hg and 80 mm Hg 80 mm Hg and 80 mm Hg 70 mm Hg and 120 mm Hg .

Problem 40 In the development history of mammalian heart, it is observed that it passes through a two chambered fish like heart, three chambered frog like heart and finally four chambered stage. To which hypothesis cab this above cited statement be approximated? Lamarck’s principle Mendalian principles Biogenetic law Hardy Weinberg law .

Problem 41 The lower jaw in mammals is made up of Dentary Maxills Angualrs Mandible.

Problem 42 Calcitonin is a thyroid hormone which Elevates calcium level in blood Has no effect on calcium Elevates potassium level in blood Lowers calcium level in blood.

Problem 43 The age of the fossil of Dryopithecus on the geological time scale is 2.5 x 106 years back 50 x 106 years back 75 x 106 years back 25 x 106 years back.

Problem 44 Which one of the following statement is correct? Australopithecus is the real ancestor of modern man Neanderthal man is the direct ancestor of Homo sapiens Homo erectus is the ancestor of man Cro-magnon man’s fossil has been found in Ethiopia.

Problem 45 Species occurring in different geographical area are called as Sympatric Allopatric Sibling Neopatric.

Problem 46 The diversity in the type of beaks of finches adapted to different feeding habits on the Galapages Islands, as observed by Darwin, provides evidence for Intraspecific competition Interspecific competition Origin of species by natural selection Intraspecific variations.

Problem 47 Genetic drift operates only in Larger populations Mendelian populations Island populations Smaller populations.

Problem 48 Mental reterdation in man, associated with sex chromosomal abnormality is usually due to Moderate increase in Y complement Large increase in Y complement Reduction in X complement Increases in X complement .

Problem 49 Most appropriate term to describe the life cycle of Obelia is Metorphosis Neoteny Metagenesis All of these .

Problem 50 Warm ocean surge of the peru current recurring every 5 to 8 years or so in the East Pacific of South America is widely known as EI Nino Aye Aye Magnox Cull stream.

Problem 51 Solencytes are the main excretory structures in Echinodermates Platyhelminthes Annelids Mollusks.

Problem 52 The functional unit of contractile system in strained muscle is Sarcocomere Z-band Cross bridges Myofibril.

Problem 53 The periderm includes Secondary phloem Cork Cambium All of these .

Problem 54 Which one of the following is a protein deficiency disease? Kwashiorkor Night blindness Eczema Cirrhosis.

Problem 55 The water potential and osmotic potential of pure water are 100 are 200 zero and 100 100 and zero zero and zero.

Problem 56 Which of the following meristems is responsible for extrastelar secondary growth in dictyledonous stem ? Interfascicular cambium Intercalary meristem Phellogen Intrafascicular cambium.

Problem 57 The long bones are hollow and connected by air passages. They are the characteristics of Reptilia Land vertebrates Aves Mammals.

Problem 58 Cellulose, the most important constituent of plant cell wall is made up of Branched chain of glucose molecules linked by β 1, 4 glycoside bond in straight chain and α1, 6 glycosidic bond at the site of branching Unbranched chain of glucose molecules linked by 1, 4 glycosidic bond Branched chain of glucose molecules linked by 1, 6 glycosidic bond at the site of branching Unbranched chain of glucose molecules linked by 1, 4 glycosidic bond.

Problem 59 The embryo in sunflower has Two ctyledons Many cotyledons No cotyledon One cotyledon.

Problem 60 Which combination of gases is suitable for fruit ripening ? 80 % CH4 and 20% CO2 80% CO2 and 20% O2 80% C2H4 and 20% CO2 80% CO2 and 20% CH2.

Problem 61 The chemical knives of DNA are Endonucleases Transcriptases Ligases Polymerases.

Problem 62 What is Agent Orange? Colour used influorescent lamp A hazardous chemical used in luminous paints A biodegradable insecticide A weedicide containing dioxin.

Problem 63 How many genome types are present in a typical green plants cell? More than five More than ten Two three.

Problem 64 Botulism caused by Clostridium botulinum affects the Lymph glands Neuromuscular junction Spleen Intestine.

Problem 65 Floral features are chiefly used in angiosperms identification because Flowers can be safely pressed Reproductive parts are more stable and conservative than vegetative parts Flowers are nice to work with Flowers are of various colours.

Problem 66 How carbon monoxide, emitted by automobiles, prevents transport of oxygen in the body tissues? By forming a stable compound with haemoglobin By obstructing the reaction of oxygen with haemoglobin By changing oxygen into carbon dioxide By destroying the haemoglobin.

Problem 67 In a terrestrial ecosystem such as forest, maximum energy is in which trophic level ? T3 T4 T1 T2.

Problem 68 DNA elements, which can switch their position, are called Cistrons Transposons Exons Introns.

Problem 69 An interesting modification of flower shape for insect pollination occurs in some orchids in which a male insect mistakes the pattern on the orchid flower for the females species and tries to copulate with it, thereby pollinating the flower, This phenomenon is called Pseudopollination Pseudoparthenocarpy Mimicry Pseudocopulations.

Problem 70 Two bacteria found to be very useful in genetic engineering experiments are Nitrobacter and Azotobacter Rhizobium and Diplococcus Nitrosomonas and Kiebsiella Escherichia and Agrobacterium.

Problem 71 The walking fen is so named because It propagates vegetatively by its leaf tips It known how to walk by itself Its spores are able to walk It is dispersed through the agency of walking animals.

Problem 72 In the five kingdom system of classification, which single kingdom out of the following can include blue-green algae, nitrogen fixing bacteria and methanogenicarchaebacteria? Plantae Protista Monera Fungi.

Problem 73 A few organisms are known to grow and multiply at temperatures of 100-1500C. They belong to Thermophilicsulphur bacteria Hot spring blue-green algae Thermophilicsubaerial fungi Marine archaebacteria.

Problem 74 B and O. Bryophytes are dependent on water, because Water is essential for their vegetative propagation The sperms can easily reach upto egg in the archegonium Archegonium has to remain filled with water for fertilization Water is essential for fertilization for their homosporous nature.

Problem 75 The main role of bacteria in the carbon cycle involves Chemosynthesis Digestion or breakdown of organic compounds Photosynthesis Assimilation of nitrogenous compounds.

Problem 76 Puccinia forms uredia and Telia on wheat leaves Aecia on barberry leaves Pycnia on barberry leaves Aecia on wheat leaves.

Problem 77 Ulothrix can be described as a Filamentous alga lacking flagellated reproductive stages Membranous alga producing zoospores Filamentous alga with flagellated reproductive stages Non-motile colonial alga lacking zoospor

Problem 78 Which of the following pesticides is an acetylcholinesterase inhibitor? Endosulfan Malathion Aldrin Y-BHC.

Problem 79 Biological control component is central to advanced agricultural production. Which of the following is used as a third generation pesticide? Insect repellants Organophosphate and carbamates Pathogens Pheromones.

Problem 80 The DNA of E.coli is Double stranded and linear Double stranded and circular Single stranded and linear Single stranded and circular.

Problem 81 Largest sperms in the plants world are found in Banyan Cycas Thuja Pinus.

Problem 82 Farmers have reported over 50% higher yields of rice by using which of the following biofertilizer? Cyanobacteria Legume-Rhizobium Symbiosis Mycorrhiza Azollapinnata.

Problem 83 Genes that are involved in turning on or off the transcription of a set of structural genes are called Redundant genes Regulatory genes Polymorphic genes Operator genes.

Problem 84 If Mendel had studied the seven traits using a plant with 12 chromosomes instead of 14, in what way would his interpretation have been different? He would not have discovered the law of independent assortment He would have discovered sex linkage He could have mapped the chromosome He would not have discovered blending or incomplete dominance.

Problem 85 A bacterium divides every 35 minutes. If a culture containing 105 cells per ml is grown for 175 minutes, what will be the cell concentration per ml after 175 minutes? 35 x 105 cells 32 x 105 cells 175 x 105 cells 85 x 105 cells.

Problem 86 What base is responsible for hot spots for spontaneous point mutations? 5-bromouracil 5-methylcytosine guanine adenine.

Problem 87 Which of the following communities is more vulnerable to invasion by outside animals and plants ? Temperate forests Oceanic island communities Mangroves Tropical evergreen forests.

Problem 88 Restriction endonucleases are Used for in vitro DNA synthesis used in genetic engineering Synthesized by bacteria Present in mammalian cells for degradation of DNA.

Problem 89 Which one of the following statements about cytochrome P450 is wrong? It is a coloured cell It is an enzyme involved in oxidation reactions It has an important role in metabolism It contains iron.

Problem 90 Typhoid fever is caused by Shigella Escherichia Giardia Salmonella

Problem 91 Genetic engineering is possible, because We can but DNA at specific sites by endonucleases like DNAase I Restriction endonucleases purified from bacteria can be used in vitro The phenomenon of transduction in bacteria is well underwood We can see DNA by electron microscope.

Problem 92 The response of different organisms to the environmental rhythms of light and darkness is called Vernalization Photoperiodism Phototaxis Phototropism.

Problem 93 A woman with two genes for haemophilia and noe gene for colour blindness on one of the ‘X’ chromosomes marries a normal man. How will the progeny be? 50% haemophiliccolour-blind sons and 50% normal sons 50% haemophilic daughters and 50% colour blind daughters all sons and daughters haemophilic and colourblind haemophilic and colour-blind daughters.

Problem 94 The formation of multivalents at meiosis in diploid organism is due to Deletion Reciprocal translocation Monosomy Inversion.

Problem 95 Which one of the following statements about Cycas is incorrect? It has circinatevernation Its xylem is mainly composed of xylem vessel its roots contain some blue-green algae it does not have a well organized female flower.

Problem 96 The rate at which light energy is converted into chemical energy of organic molecules is the ecosystem’s Net secondary productivity Gross primary productivity Net primary productivity Gross secondary productivity

Problem 97 Which important green-house gas, other than methane, is being produced from the agricultural fields? Ammonia Nitrous oxide Arsine Sulphur dioxide.

Problem 98 Microtubule is involved in the Muscle contraction Membrane architecture Cell division DNA recognition.

Problem 99 A plant hormone used for inducing morphogenesis in plant tissue culture is Cytokinins Ethylene Abscisic acid Gibberellins.

Problem 100 Which of the following is the contractile protein of a muscle? Tropomyosin Tubulin Myosin All of these.

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AIPMT Biology Past Paper Questions

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AIPMT Biology Past Paper Questions