Aipmt biology past paper questions

aipmt–Past papers BIOLOGY - UNSOLVED PAPER - 2008

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 A competitive inhibitor of succinicdehydrogenase is -Ketoglutarate Malate Malonate Oxaloacetate.

Problem 02 Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in Annual plants Floral parts Vessels and tracheid differentiation Leaf abscission

Problem 03 Which one of the following statements is incorrect about menstruation? At menopause in the female, there is especially abrupt increase in gonadotropic hormones The beginning of the cycle of menstruation is called menarche During normal menstruation about 40 ml blood is lost The menstrual fluid can easily clot.

Problem 04 Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/ linkage? Erythroblastosisfoetalis- X- linked Down’s syndrome - 44 autosomes + XO Klinefelter’s syndrome - 44 autosomes +XXY Colour blindness – Y –linked.

Problem 05 In leaves of C4 plants malic acid synthesis during CO2 fixation occurs in Bundle sheath Guard cells Epidermal cells Mesophyll cells.

Problem 06 What is true about the isolated small tribal populations? Wrestlers who develop strong body muscles in their life pass this character on to their progeny There is no change in population size as they have a large gene pool There is a decline in population as boys marry girls only from their own tribe Hereditary diseases like colour blindness do not spread in the isolated population.

Problem 07 Replum is present in the ovary of flower of Sun flower Pea Lemon Mustard.

Problem 08 Unisexuality of flowers prevents Geitonogamy, but not xenogamy Autogamy and geitonogamy Autogamy, but not geitonogamy Both geitonogamy and xenogamy

Problem 09 The length of different internodes in a culm of sugarcane is variable because of Size of leaf lamina at the node below each internode Intercalary meristem Shoot apical meristem Position of axillary buds

Problem 10 Which one of the following is not observed in biodiversity hotspots? Lesser inter-specific competition Species richness Endemism Accelerated species loss

Problem 11 Which one of the following is the correct percentage of the two (out of the total of 4) green house gases that contribute to the total global warming? N2O 6%, CO2 86% METHANE 20%, N2O 18% CFCS 14%, METHANE 20% CO2 40%, CFCS 30%.

Problem 12 The two sub-units of ribosome remain united at a critical ion level of Magnesium Calcium Copper Manganese

Problem 13 Given below are four methods (A-D) and their modes of action (a-d) in achieving contraception. Select their correct matching from the four options that follow Method Mode of Action The pill (i)Prevents sperms reaching cervix Condom (ii)Prevents implantation Vasectomy (iii)Prevents ovulation Copper T (iv)Semen contains no sperms A-(iii), B(iv), C(i), D (ii) A-(ii), B(iii), C(i), D (iv) A-(iii), B(i), C(iv), D (ii) A-(iv), B(i), C(ii), D (iii)

Problem 14 The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because A proton gradient forms across the inner membrane There is a change in the permeability of the inner mitochondrial membrane toward adenosine diphosphate (ADP) High energy bonds are formed in mitochondrial proteins ADP is pumped out of the matrix into the intermembrane space

Problem 15 The linking of antibiotic resistance gene with the plasmid vector became possible with DNA polymerase Exonucleases DNA ligase Endonucleases

Problem 16 The rupture and fractionation do not usually occur in the water column in vessel or tracheids during the ascent of sap because of Weak gravitational pull Transpiration pull Lignified thick walls Cohesion and adhesion

Problem 17 Thorn of Bougainvillea and tendril of Cucubita are examples of Vestigial organs Retrogressive evolution Analogous organs Homologous organs

Problem 18 Consider the following four measures (1-4) that could be taken to successfully grow chickpea in an area where bacterial blight disease is common Spray with Bordeaux mixture Control of the insect vector of the disease pathogen Use of only disease-free seeds Use of varieties resistant to the disease Which two of the above measures can control the disease? 3 and 4 1 and 4 2 and 3 1 and 2

Problem 19 World Summit on Sustainable Development (2002) was held in Argentina South Africa Brazil Sweden

Problem 20 Darwin’s Finches are an excellent examples of Brood parasitism Connecting links Adaptive radiation Seasonal migration

Problem 21 Polysome is formed by A ribosome with several subunits Ribosomes attached to each other in a linear arrangement Several ribosomes attached to a signal m RNA Many ribosomes attached to a strand of endoplasmic reticulum

Problem 22 Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it? Guanine, adenine – purines Adenine, thymine- purines Thymine, uracil- pyrimdines Uracil, cytosine- pyrimidines

Problem 23 The fruit is chambered, developed from inferior ovary and has seeds with succulent testa in Guava Cucumber Pomegranate Orange

Problem 24 Endosperm is consumed by developing embryo in the seed of Pea Maize Coconut Castor

Problem 25 In the DNA molecule The proportion of adenine in relation to thymine varies with the organism There are two strands which run antiparallel-one in 5' -> 3' direction and other in 3' -> 5' The total amount of purine nucleotides and pyrimidine nucleotides is not always equal There are two strands which run parallel in the 5' -> 3' direction

Problem 26 Which type of white blood cells are concerned with release of histamine & the natural anticoagulant heparin? Eosinophils Monocytes Neutrophils Basophils

Problem 27 Thermococcus, methanococcus & methanobacterium exemplify Bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria Bacteria that contain a cytoskeleton & ribosomes Archaebacteria that contain protein homologous to eukaryotic core histones Archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled

Problem 28 Which one of the following is being tried in India as a biofuel for fossil fuels? Musa Aegilops Jatropha Azadirachta

Problem 29 Dry indehiscent single-seeded fruit formed from bicarpellarysyncacarpous inferior ovary is Berry Cremocarp Caryopsis Cypsela

Problem 30 Which one of the following pairs of codons is correctly matched with their function or the signal for the particular amino acid? AUG, ACG-start/methionine UUA, UCA-leucine GUU, GCU-alanine UAG, UGA-stop

Problem 31 Select one of the following pairs of important features distinguish gnetum from cycas & pinus & showing affinities with angiosperms Perianth & two integuments Embryo development development & apical meristem Absence of resin duct & leaf venation Presence of vessel elements & absence of archegonia

Problem 32 Earthworms have no skeleton but during burrowing, the anterior end becomes turgid & acts as a hydraulic skeleton.it is due to Gut peristalsis Setae Coelomic fluid Blood

Problem 33 Which one of the following is the true description about an animal concerned? Rat-left kidney is slightly higher in position than the right one Cockroach-10 pairs of spiracles (2 pairs on thorax & 8 pairs on abdomen) Earthworm-the alimentary canal consists of a sequence of pharynx, oesophagus, stomach, gizzard,& intestine Frog-body divisible into three regions-head, neck & trunk

Problem 34 Which extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus? Yolk sac Amnion Chorion Allantosis

Problem 35 About 70% of total global carbon is found in Oceans Forests Grasslands Agroecosystems

Problem 36 Human insulin is being commercially produced from a transgenic species of Rhizobium Saccharomyces Escherichia Mycobacterium

Problem 37 Vacuole in a plant cell Lacks membrane and contains air Lacks membrane and contains water and excretory substances Is membrane-bound and contains storage proteins and lipids Is membrane-bound and contains water and excretory substances

Problem 38 Quercus species are the dominant component in Scrub forests Tropical rain forests Temperate deciduous forests Alpine forests

Problem 39 Vascular tissues in flowering plants develop from Periblem Dermatogen Phellogen Plerome

Problem 40 Gel electrophoresis is used for Construction of recombinant DNA by joining with cloning vectors Isolation of DNA molecules Cutting of DNA into fragments Separation of DNA fragments according to their size

Problem 41 Which one of the following pair of organs includes only the endocrine glands? Thymus and testes Adrenal and ovary Parathyroid and adrenal Pancreas and parathyroid

Problem 42 Haploids are more suitable for mutation studies than the diploids. This is because Haploids are more abundant in nature than diploids All mutations, whether dominant or recessive are expressed in haploids Haploids are reproductively more stable than diploids Mutagens penetrate in haploids more effectively than in diploids

Problem 43 Consider the following four statements (1-4) about certain desert animals such as kangaroo rat They have dark color and high rate of reproduction and excrete solid urine They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs They feed on dry seeds and do not require drinking water They excrete very concentrated urine and do not use water to regulate body temperature Which two of the above statements for such animals are true? 3 and 1 1 and 2 3 and 4 2 and 3

Problem 44 Which one of the following is not a characteristic of phylum annelida? Pseudocolelom Ventral nerve cord Closed circulatory system Segmentation

Problem 45 In human adult females oxytocin Stimulates pituitary to secret vasopressin Causes strong uterine contractions during parturition Is secreted by anterior pituitary Stimulates growth of mammary glands

Problem 46 The most active phagocytic white blood cells are Eosinophils & lymphocytes Neutrophils & monocytes Neutrophils & eosinophils Lymphocytes & macrophages

Problem 47 In which of the following male& female game-tophytes do not have free living independent existence? Polytrichum Cedrus Pteris Funaria

Problem 48 What is vital capacity of our lungs? Inspiratory reserve volume plus expiratory reserve volume Total lung capacity minus residual volume Inspiratory reserve volume plus tidal volume Total lung capacity minus expiratory reserve volume

Problem 49 Which of the following is heterosporous? Adiantum Equisetum Dryopteris Salvinia

Problem 50 The blood calcium level is lowered by the deficiency of Both calcitonin & parathormone Calcitonin Parathormone Thyroxin

Problem 51 The C4 plants are photo synthetically more efficient than C3 plants because The CO2 efflux is not prevented They have more chloroplasts The CO2 compensation point is more CO2 generated during photorespiration is trapped & recycled through PEP carboxylase

Problem 52 Which one of the following phyla is correctly matched with its general characteristics? Echinodermata-pentamerous radial symmetry & mostly internal fertilization Mollusca-normally oviparous & development through a trochophore or veliger larva Arthropoda-body divided into head, thorax & abdomen & respiration by tracheae Chordate-notochord at some stage & separate anal & urinary openings to the outside

Problem 53 In germinating seeds fatty acids are degraded exclusively in the Peroxisomes Mitochondria Proplastids Glyoxysomes

Problem 54 Which one of the following is the correct difference between rod cells & cone cells of our retina? Rod cels Cones cells Overall functions Visual in poor light Colour Vision &detailed Vision in bright light Distribution More Evenly distributed concentrated in center of retina all over retina Visual acuity High low Visual pigment contained iodopsionRhodopsin

Problem 55 In light of recent classification of living organisms into three domains of life (bacteria, archaea & eukarya), which one of the following statements in true about archaea ? Archaea completely different from both prokaryotes & eukaryotes Archaea completely different from prokaryotes Archaea resemble eukarya in all respects Archaea have some novel features that are absent in other prokaryotes & eukaryotes

Problem 56 Which one of the following proved effective for biological control of nematodal disease in plants? Gliocladiumvirens Paecilomyceslilacinus Pisolithustinctorius Pseudomonas cepacia

Problem 57 A lake near a village suffered heavymortality of fishes within a few days.consider the following reasons for this? Lots of urea & phosphate fertilizer were used in the crops in the vicinity The area was sprayed with DDT by an aircraft The ake water turned green & stincky Phytoplankton populations in the lake declined initially there by greatly reducing photosynthesis Which of the above were the main causes of fish mortality in the lake? A, C A, B B, C C, D

Problem 58 The table below gives the population (in thousands) of ten species ( A- J) in four area (p-s) consisting of the number of habitats given within brackets against each. Study the table & answer the question which follows

Problem Which area out of p-s shows maximum species diversity? s p q r

Problem 59 During the propagation of a nerve impulse, the action potentials results from the movement of K+ions from intracellular fluid to extracellular fluid Na+ions from extracellular fluid to intracellular fluid K+ions from extracellular fluid to extracellular fluid Na+ ions from intracellular fluid to extracellular fluid

Problem 60 Consider the following statements concerning food chains Removal of 80% tigers from an area resulted in greatly increased growth of vegetation Removal of most of the carnivorous resulted in an increased population of deers The length of food chains is generally limited to 3-4 trophic levels due to energy loss The length of food chains may vary from 2 to 8 trophic levels Which two of the above statements are correct? A, D A, B B, C C, D

Problem 61 Modern detergents contain enzymes preparations of Thermoacidophiles Thermophiles Acidophiles Alkaliphiles

Problem 62 What is antisense technology? When a piece of RNA that is complementary in sequence is used to stop expression of a specific gene RNA polymerase producing DNA A cell displaying a foreign antigen used for synthesis of antigens Producing of somaclonal variants in tissue cultures

Problem 63 Cornes transplant in humans is almost never rejected. This is because It is composed of enucleated cells It is non-living layer Its cells are least penetrable by bacteria It has no blood loss

Problem 64 Which one of the following is incorrect about the characteristics of probionts as envisaged in the abiogenic origin of life? They were partially isolated from the surroundings They could maintain an internal environment They were able to reproduce They could separate combinations of molecules from the surroundings

Problem 65 In humans, blood passes from the post caval to the diastolic right atrium of heart due to Stimulation of the sino auricular node Pressure difference between the post caval & atrium Pushing open of the venous valves Suction pull

Problem 66 Which one of the following is resistant to enzymes action Pollen exine Leaf cuticle Cork Wood fibre

Problem 67 According to central pollution board (CPCB) which particulate size in diameter of the air pollutants is responsible for greatest harm to human health? 1 or less 5.2-2.5 2.5 Or less 1.5 Or less

Problem 68 Cellulose is the major component of cell walls of Pseudomonas Saccharomyces Pythium Xanthomonas

Problem 69 What does the filiform apparatus do at the enterence into ovule ? It bring about opening of the follintubt It guides pollen tube from a synergid to egg It helps in the entry of pollen tube into a synergid. It helps in the entry of pollen tube into the embryosac

Problem 70 Match the disease in the column (i) with the appropriate items (pathogen/prevention / treatment) in column (ii) A- (i) ,B- (i), C-(iii), D(iv) A- (ii) ,B- (iii), C-(iv), D(i) A- (i) ,B- (ii), C-(iii), D(iv) A- (ii) ,B- (iv), C-(i), D(iii)

Problem 71 Carbohydrates are commonly found as starch in plants storage organs. Which of the following five properties of starch(1-5) make it useful as a storage material? Easily translocated, Chemically non react,Easily digested by animals,Osmotically inactive ,Synthesized during photosynthesis The useful properties are 1, 3 & 5 1 & 5 2 & 3 2 & 4

Problem 72 The slow rate of decomposition of fallen logs in nature is due to their Anaerobic environment around them Low cellulose content Low moisture content Poor nitrogen content

Problem 73 Cry I endotoxinsuptained from bacillus thuringiensis are effective against Nematodes Boll worms Mosquitoes Flies

Problem 74 Consider the statements given below regarding contraception and answer as directed thereafter Medical termination of pregnancy (MTP) during first trimester is generally safe Generally chances of conception are nill until mother breast feeds the infant upto two years Intrauterine divices like copper-T are effective contraceptors Contraception pills may be taken upto one week after coitus to prevent contraception Which two of the above statements are correct? 1, 3 1,2 2, 3 3, 4

Problem 75 Bacterial leaf blight of rice is caused by a species Alternaria Erwinia Xanthomonas Pseudomonas

Problem 76 Trichodermaharzianum has proved a useful microorganism for Gene transfer in higher plants Biological control of soil borne plant pathogens Bioremediation of contaminated soils Reclamation of waste lands

Problem 77 Which one of the following pairs of items correctly belongs to the category of organs mentioned against it? Nephredia of earth worm and malphigian tubules of cockroach-excretory organs Wings of honey bee and wings of crow-homologous organs Thorn of bougainvillea and tendrance of cucurbita-analogous organs Nictitating membrane and brain spot in human eye-vestigial organs

Problem 78 To which type of barriers under innate immunity, do the saliva in the mouth and the tears from the eyes, belong? Physiological barriers Physical barriers Cytokine barriers Cellular barriers

Problem 79 Which one of the following groups of three animals each is correctly matched with their one characteristic morphological feature A transgenic food crop which may help in solving the problem of night blindness in developing countries is Bt soyabean Golden rice Flavrsavr tomatoes Star link maize

Problem 80 Which one of the following is the correct matching of the site of action on the given substrate, the enzyme acting upon it and the end product? Small intestine: proteins aminoacids Stomach: fats miclles Deuodenum: triglycerides monoglycerides Small intestine: starch disaccharide

Problem 81 What will happen if the secretion of parietal cells of gastric glands is blocked with an inhibitor? In the absence of HCl secretion, inactive pepsinogen is not converted into the active enzyme pepsin Enterokinase will not be released from the duodenal mucosa and so tripsinogen is not converted to trypsin Gastric juice will be deficient in chymosin Gastric juice will be deficient in pepsinogen

Problem 82 Nitrogen fixation in root nodules of alnus is brought about by Frankia Azorhizobium Bradyrhizobium Clostridium

Problem 83 Which one of the following is the correct statement regarding the particular psychotropic drug specified? Morphine leads to delusions and disturbed emotions Barbiturates cause relaxation and temporary euphoria Hashish causes after thought perceptions and hallucinations Opium stimulates nervous systems causes hallucinations

Problem 84 The energy releasing process in which the substrate is oxidized without an external electron acceptor is called Aerobic respiration Glycolysis Fermentation Photorespiration

Problem 85 The haemoglobin of a human foetus Has only two protein subunits instead of four Has a higher affinity for oxygen than that of an adult Has a lower affinity for oxygen than that of an adult Its affinity for oxygen is the same as that of an adult

Problem 86 Which one of the following pairs of plant structures has haploid number of chromosomes? Nucellus & antipodal cells Egg nucleus & secondary nucleus Megaspore mother cell Egg cell & antipodal cells

Problem 87 Which one of the following items gives its correct total number? Types of diabetes-3 Cervical vertebrae in humans-8 Floating ribs in humans-4 Amino acids found in proteins-16

Problem 88 Keeping in view the ‘fluid mosaic model’ for the structure of cell membrane, Which one of the following statement is correct with respect to the movements of lipids & proteins from one lipid monolayer to the other (described as flipflop movement)? While proteins can flip-flop, lipids cannot Neither lipids, nor proteins can flip-flop Both lipids & proteins can flip-flop While lipids can rarely flip-flop, proteins cannot

Problem 89 Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide ? Loose smut of wheat Black rust of wheat Bacterial leaf blight of rice Downy mildew of grapes

Problem 90 Main objective of production /use of herbicide resistant GM crops is to Encourage eco-friendly herbicides Reduce herbicide accumulation in food articles for health safety Eliminate weeds from the field without the use of manual labour Eliminate weeds from the field without the use of herbicides

Problem 91 Which one of the following, in birds, indicates their reptilian ancestry? Two special chambers crop & gizzard in their digestive tract Eggs with a calcareous shell Scales on their hind limbs Four-chambered heart

Problem 92 Consider the following statements about bio-medical technologies During open heart surgery blood is circulated in the heart-lung machine Blockage in coronary arteries is removed by angiography Computerized axial tomography (CAT) shows detailed internal structures as seen in a section of body X-ray provides clear & detailed images of organs like prostate glands & lungs Which two of the above statements are correct? 1 & 3 1 & 2 2 & 4 3& 4

Problem 93 Ascaris is characterized by Presence of true coelom but absence of metamerism Presence of true coelom & metamerism (metamerization) Absence of true coelom but presence of metamerism Presence of neither true coelom nor metamerism

Problem 94 In humans, at the end of the first meiotic division, the male germ cells differentiate into the Spermatids Spermatozonia Primary spermatocytes Secondary spermatocytes

Problem 95 Electrons from excited chlorophyll molecule of photosystem II are accepted first by Quinine Ferrodoxin Cytochrome-b Cytochrome-f

Problem 96 Importance of day length in flowering of plants was first shown in Cotton Petunia Lemna Tobacco

Problem 97 The fleshy receptacle of syconus of fig encloses a number of Berries Mericarps Achenes Samaras

Problem 98 Which one of the following scientst’s name is correctly matched with the theory putforth by him? De Vries-natural selection Mendel-theory of pangenesis Weismann-theory of continuity of germ plasm Pasteur-inheritance of acquired characters

Problem 99 Given below is a diagrammatic crossection of a single loop of human cochlea Which one of the following options Correctly represents the names of three different parts ? D : Sensory hair cells, A : endolymph B : tectorial membrane A : perilymph, B : tectorialmembrane, C : endolymph B : tectorial membrane, C : perilymph, D : secretory cells C : endolymph, D : sensory hair cells, A : serum.

Problem 100 Which one of the following options correctly represents the names of three different parts? D : sensory hair cells, A:endolymph B: tectorial membrane A: perilymph, B: tectorial membrane, C: endolymph B: tectorial membrane C: perilymph D : secretory cells C: endolymph D : sensory hair cells A : serum

Aipmt biology past paper questions

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