AFMC Biology 1999

aFMC–Past papers BIOLOGY- UNSOLVED PAPER - 1999

SECTION – I (Total Marks : 50) 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 Formation of primitive streak in the chick embryo is the first sign of Notogenesis Nlastulation Neurilation Gastrulation.

Problem 02 Which hormone promotes cell division, protein synthesis and bone growth? PTH ACTH ADH GH

Problem 03 Which of the following has non-myelinatednervefibres? Optic nerves Autonomic nerves Cranial nerves Spinal nerves

Problem 04 Which of the following is true about cleavage in the fertilised egg in humans? It is identical to the normal mitosis It starts when the egg is in fallopian tube It starts when the egg reaches uterus It is meroblastic

Problem 05 Mammalian brain differs from an amphibian brain in possessing Olfactory lobe Hypothalamus Cerebellum Corpus callosum

Problem 06 Jacobson's organ is concerned with Touch Hearing Smell Sight

Problem 07 Adjacent epithelial cells are held together by Iysosomes Glyoxysomes Desmosomes Microsomes

Problem 08 Which of the following is true for DNA helices? DNA helices are ATP dependent unwinding enzymes Promote separation of the two parental strands and establish replication forks DNA helices hydrolyze ATP All of these

Problem 09 What is the name of cycle which generates energy and splits water into hydrogen and oxygen? Glycogenolysis Citric acid cycle Photophosphorylation Electron transport chain

Problem 10 Tendons and ligaments are tissues of the category of vascular tissue Epithelial tissue Skeletal tissue Connective tissue

Problem 11 Antedon belongs to Asteroida Crinoidea Ophiuroidea Echinoidea

Problem 12 Sub-class prototheria is related with egg laying mammals such as Kangaroo Echidna Ornithorhynchus Both (b) and (c)

Problem 13 The maintenance of internal favourable conditions, by a self regulated mechanisms, in spite of the fact that there are changes in the environment, is known as Enthalpy Steady state Entropy Homeostasis

Problem 14 RNA retroviruses have a special enzyme that Disintegrates host DNA Polymerises host DNA Transcribe viral RNA to c-DNA Translates host DNA.

Problem 15 The nephrostomes, in the kidneys, are functional in Adult frog Cockroach Tadpole Rabbit

Problem 16 Bidder's canal is found in Kidney of frog Kidney of mammal Ovary of mammal Testes of frog

Problem 17 The main function of Henle's loop is Passage of urine Filtration of blood Formation of urine Conservation of water

Problem 18 Peeling of ozone umbrella, which protects us from UV-rays, is caused by C02 PAN CFCs Coal burning

Problem 19 The correct sequence of food chain is grass -> wolf-> deer ->buffalo grass ->insect-> birds-> snake bacteria -> grass-> rabbit-> wolf grass -> snake -> insect -> deer

Problem 20 Sickle-cell anaemia is one of the good examples for which of the following? Pleiotropy Co-dominance Epistasis Incomplete dominance

Problem 21 Diphtheria is caused by which of the following? Virus Fungi Bacteria Algae

Problem 22 Ancestral amphibians were tetrapods that evolved during Jurassic period Cretaceous period Devonian period Carboniferous period

Problem 23 During elongation of polypeptide chain (in translation), the sigma factor is Used during the closing of chain Released to take part again Retained and it performs special function Functionless

Problem 24 Which of the following is a salt balancing hormone? Folliotropin Glucocorticoid Somatotrophin Mineralocorticoid

Problem 25 The term 'niche' of a species refers to Specific place where an organism lives Competitive power of an organism Specific function of organism Specific and habitual function

Problem 26 Pyramid of energy, in a pond ecosystem, is always Upright only Irregular Inverted Linear

Problem 27 The treeless biomes include Tundra Deserts Grassland All of these

Problem 28 When fungi feed on dead organic matter, they are known as Parasites Saprophytes Dimorphic None of these

Problem 29 The antherozoids of Marchantia are Short, curved and biflagellate Long, straight and biflagellate Short, straight and multiflagellate Long curved and biflagellate

Problem 30 Gymnosperms lack fruit, because they lack Ovule Seed Ovary Embryo

Problem 31 Territoriality occurs as a result of Predation Competition Co-operation Parasitism

Problem 32 In monocots, grafting is almost impossible because they lack Vascular bundle Parenchymatous cells Ground tissue Cambium

Problem 33 The thurioside is a proteinaceous toxin, which is obtained from Green manure Farmyard manure Bacterial origin Biofertilisers

Problem 34 Which of the following statements is correct? Legumes fix nitrogen only through specialized bacteria that live in their leaves Legumes fix nitrogen independently of the specialized bacteria that live in their roots Legumes fix nitrogen only through the specialized bacteria that live in their roots Legumes are incapable of fixing nitrogen.

Problem 35 The mutations can be induced in bacteria by Growing different strains Adding all required substances Exposure to high energy radiations Starving the bacteria

Problem 36 From which of the following is agar obtained ? Gelidium Batrachospermum Gracilaria All of these

Problem 37 Most of the water, in mature plant cells, occurs chiefly in which of the following? Cell wall Cytoplasm Vacuoles Nucleus

Problem 38 How many meiotic divisions are required to produce 100 pollen grains? 70 25 125 100

Problem 39 Anaerobic respiration is also called Fragmentation Multiplication Fermentation Restoration

Problem 40 The closing and opening of the leaves of Mimosa pudica is due to Hydrotropic movement Chemonastic movement Seismonastic movement Thermonastic movement.

Problem 41 The soil particles, particularly clay and organic matter in soil, contain negative charges that attract positively charged ions such as K++ Mg+ Ca++ All of these

Problem 42 In double fertilization, the male gamete and secondary nucleus give rise to Embryo Gametes Egg Endosperm

Problem 43 Radioactive tracer studies with ,4C have confirmed that Phloem transports organic nutrients Xylem transports organic nutrients Phloem transports inorganic nutrients Xylem transports organic nutrients

Problem 44 A clone is a group of individuals obtained through Cross-pollination Self-pollination Vegetative propagation Hybridization

Problem 45 Which of the following eras, in geological time- scale, corresponds to the period when life had not originated upon the earth? Mesozoic Archaeozoic Palaeozoic Azoic.

Problem 46 The crossing over frequency is proportional to Haploid number of chromosome Diploid number of chromosome Recombinant phenotypic frequency Genotypic frequency

Problem 47 The polytene chromosomes were discovered for the first time in Drosophila Muscadomestica Chironomos Muscanebulo

Problem 48 In submerged plants, the stomata lie on Not on any surface Both upper and lower surfaces Upper surface Lower surface

Problem 49 A fruit, developing from an inflorescence, is called Etaerio of achenes Composite fruit Etaerio None of these

Problem 50 Beauty of flower Bougainvillea is due to Androecium Bract Calyx Corolla

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AFMC Biology 1999

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