AIPMT 2008 · Biology

AIPMT 2008 Biology Questions with Solutions

The AIPMT 2008 paper had 102 Biology questions from 22 chapters. By section: 57 Botany and 45 Zoology.

Ecosystem and Structural Organisation in Animals had the most questions (11 each), followed by The Living World with 10.

2 questions below have the answer and explanation free; the other 100 are in Premium.

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Chapter-wise: AIPMT 2008 Biology

How many questions each chapter had in AIPMT 2008. Open a chapter for its questions from every year.

  1. Ecosystem· Botany11 Qs
  2. Structural Organisation in Animals· Zoology11 Qs
  3. The Living World· Botany10 Qs
  4. Biotechnology and Its Applications· Zoology7 Qs
  5. Microbes in Human Welfare· Botany7 Qs
  6. Principles of Inheritance and Variation· Botany6 Qs
  7. Sexual Reproduction in Flowering Plants· Botany6 Qs
  8. Body Fluids and Circulation· Zoology5 Qs
  9. Cell: The Unit of Life· Botany5 Qs
  10. Photosynthesis in Higher Plants· Botany5 Qs
  11. Chemical Coordination and Integration· Zoology4 Qs
  12. Human Health and Disease· Zoology4 Qs
  13. Human Reproduction· Zoology3 Qs
  14. Molecular Basis of Inheritance· Botany3 Qs
  15. Neural Control and Coordination· Zoology3 Qs
  16. Biotechnology: Principles and Processes· Zoology2 Qs
  17. Breathing and Exchange of Gases· Zoology2 Qs
  18. Plant Growth and Development· Botany2 Qs
  19. Reproductive Health· Zoology2 Qs
  20. Respiration in Plants· Botany2 Qs
  21. Biomolecules· Zoology1 Q
  22. Evolution· Zoology1 Q

All 102 AIPMT 2008 Biology questions

In paper order. Try each one, then open the answer where it is shown.

  1. Question 1 (AIPMT 2008, Q93)

    Molecular Basis of InheritanceBotanyEasy
    In DNA, the complementary bases are
    1. Option A: Uracil and adenine; cytosine and guanine
    2. Option B: Adenine and thymine; guanine and cytosine
    3. Option C: Adenine and thymine; guanine and uracil
    4. Option D: Adenine and guanine; thymine and cytosine

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  2. Question 2 (AIPMT 2008, Q100)

    Chemical Coordination and IntegrationZoologyEasy
    Which one of the following is an amine hormone?
    1. Option A: Progesterone
    2. Option B: Thyroxine
    3. Option C: Oxypurin
    4. Option D: Insulin

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  3. Question 3 (AIPMT 2008, Q101)

    The Living WorldBotanyMedium
    Select one of the following of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms
    1. Option A: Embryo development and apical meristem
    2. Option B: Absence of resin duct and leaf venation
    3. Option C: Presence of vessel elements and absence of archegonia
    4. Option D: Perianth and two integuments

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  4. Question 4 (AIPMT 2008, Q102)

    The Living WorldBotanyMedium
    Thermococcus, Methanococcus and Methanobacterium exemplify
    1. Option A: Bacteria that contain a cytoskeleton and ribosomes
    2. Option B: Archaebacteria that contain proteins homologous to eukaryotic core histones
    3. Option C: Archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled
    4. Option D: Bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria

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  5. Question 5 (AIPMT 2008, Q103)

    The Living WorldBotanyEasy
    Which one of the following is heterosporous?
    1. Option A: Equisetum
    2. Option B: Dryopteris
    3. Option C: Salvinia
    4. Option D: Adiantum

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  6. Question 6 (AIPMT 2008, Q104)

    Sexual Reproduction in Flowering PlantsBotanyEasy
    In which one of the following male and female gametophytes do not have free living independent existence?
    1. Option A: Cedrus
    2. Option B: Pteris
    3. Option C: Funaria
    4. Option D: Polytrichum

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  7. Question 7 (AIPMT 2008, Q105)

    The Living WorldBotanyMedium
    Which one of the following groups of three animals each is correctly matched with their one characteristic morphological feature?
    1. Option A: Option 1
    2. Option B: Option 2
    3. Option C: Option 3
    4. Option D: Option 4

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  8. Question 8 (AIPMT 2008, Q106)

    The Living WorldBotanyMedium
    Which one of the following phyla is correctly matched with its two general characteristics?
    1. Option A: Mollusca - Normally oviparous and development through a trochophore or veliger larva
    2. Option B: Arthropoda - Body divided into head, thorax and abdomen and respiration by tracheae
    3. Option C: Chordata - Notochord at some stage and separate anal and urinary openings to the outside
    4. Option D: Echinodermata - Pentamerous radial symmetry and mostly internal fertilization

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  9. Question 9 (AIPMT 2008, Q107)

    The Living WorldBotanyEasy
    Which one of the following in birds indicates their reptilian ancestry?
    1. Option A: Eggs with a calcareous shell
    2. Option B: Scales on their hind limbs
    3. Option C: Four-chambered heart
    4. Option D: Two special chambers crop and gizzard in their digestive tract

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  10. Question 10 (AIPMT 2008, Q108)

    The Living WorldBotanyMedium
    Ascaris is characterized by
    1. Option A: Presence of true coelom and metamerism (metamerisation)
    2. Option B: Absence of true coelom but presence of metamerism
    3. Option C: Presence of neither true coelom nor metamerism
    4. Option D: Presence of true coelom but absence of metamerism

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  11. Question 11 (AIPMT 2008, Q109)

    The Living WorldBotanyEasy
    Which one of the following is not a characteristic of phylum Annelida?
    1. Option A: Ventral nerve cord
    2. Option B: Closed circulatory system
    3. Option C: Segmentation
    4. Option D: Pseudocoelom

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  12. Question 12 (AIPMT 2008, Q110)

    The Living WorldBotanyEasy
    Cellulose is the major component of cell walls of
    1. Option A: Saccharomyces
    2. Option B: Pythium
    3. Option C: Xanthomonas
    4. Option D: Pseudomonas

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  13. Question 13 (AIPMT 2008, Q111)

    Cell: The Unit of LifeBotanyEasy
    Vacuole in a plant cell
    1. Option A: Lacks membrane and contains water and excretory substances
    2. Option B: Is membrane-bound and contains storage proteins and lipids
    3. Option C: Is membrane-bound and contains water and excretory substances
    4. Option D: Lacks membrane and contains air

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  14. Question 14 (AIPMT 2008, Q112)

    Respiration in PlantsBotanyMedium
    A competitive inhibitor of succinic dehydrogenase is
    1. Option A: Malate
    2. Option B: Malonate
    3. Option C: Oxaloacetate
    4. Option D: α-Ketoglutarate
    Show answer & explanation

    Correct answer: (B) Malonate

    Explanation

    Malonate is a structural analogue of succinate and acts as a competitive inhibitor of succinate dehydrogenase by competing for the enzyme's active site.

  15. Question 15 (AIPMT 2008, Q113)

    Cell: The Unit of LifeBotanyEasy
    Polysome is formed by
    1. Option A: Ribosomes attached to each other in a linear arrangement
    2. Option B: Several ribosomes attached to a single mRNA
    3. Option C: Many ribosomes attached to a strand of endoplasmic reticulum
    4. Option D: A ribosome with several subunits

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  16. Question 16 (AIPMT 2008, Q114)

    BiomoleculesZoologyMedium
    Carbohydrates are commonly found as starch in plant storage organs. Which of the following five properties of starch (a-e) make it useful as a storage material? a. Easily translocated b. Chemically non-reactive c. Easily digested by animals d. Osmotically inactive e. Synthesized during photosynthesis The useful properties are
    1. Option A: Both a & e
    2. Option B: Both b & c
    3. Option C: Both b & d
    4. Option D: a, c & e

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  17. Question 17 (AIPMT 2008, Q115)

    The Living WorldBotanyMedium
    In the light of recent classification of living organisms into three domains of life (Bacteria, Archaea and Eukarya), which one of the following statements is true about archaea?
    1. Option A: Archaea completely differ from prokaryotes
    2. Option B: Archaea resemble eukarya in all respects
    3. Option C: Archaea have some novel features that are absent in other prokaryotes and eukaryotes
    4. Option D: Archaea completely differ from both prokaryotes and eukaryotes

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  18. Question 18 (AIPMT 2008, Q116)

    Cell: The Unit of LifeBotanyMedium
    Keeping in view the 'fluid mosaic model' for the structure of cell membrane, which one of the following statements is correct with respect to the movement of lipids and proteins from one lipid monolayer to the other (described as flip-flop movement)?
    1. Option A: Neither lipids nor proteins can flip-flop
    2. Option B: Both lipids and proteins can flip-flop
    3. Option C: While lipids can rarely flip-flop, proteins cannot
    4. Option D: While proteins can flip-flop, lipids cannot

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  19. Question 19 (AIPMT 2008, Q117)

    Photosynthesis in Higher PlantsBotanyEasy
    In germinating seeds fatty acids are degraded exclusively in the
    1. Option A: Mitochondria
    2. Option B: Proplastids
    3. Option C: Glyoxysomes
    4. Option D: Peroxisomes

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  20. Question 20 (AIPMT 2008, Q118)

    Cell: The Unit of LifeBotanyEasy
    The two sub-units of ribosome remain united at a critical ion level of
    1. Option A: Calcium
    2. Option B: Copper
    3. Option C: Manganese
    4. Option D: Magnesium

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  21. Question 21 (AIPMT 2008, Q119)

    Structural Organisation in AnimalsZoologyMedium
    Thorn of Bougainvillea and tendril of Cucurbita are examples of
    1. Option A: Retrogressive evolution
    2. Option B: Analogous organs
    3. Option C: Homologous organs
    4. Option D: Vestigial organs

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  22. Question 22 (AIPMT 2008, Q120)

    Principles of Inheritance and VariationBotanyEasy
    Haploids are more suitable for mutation studies than diploids. This is because
    1. Option A: All mutations, whether dominant or recessive, are expressed in haploids
    2. Option B: Haploids are reproductively more stable than diploids
    3. Option C: Mutagens penetrate in haploids more effectively than diploids
    4. Option D: Haploids are more abundant in nature than diploids

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  23. Question 23 (AIPMT 2008, Q121)

    Principles of Inheritance and VariationBotanyEasy
    Which one of the following pairs of nitrogenous bases of nucleic acids is wrongly matched with the category mentioned against it?
    1. Option A: Adenine, Thymine - Purines
    2. Option B: Thymine, Uracil - Pyrimidines
    3. Option C: Uracil, Cytosine - Pyrimidines
    4. Option D: Guanine, Adenine - Purines

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  24. Question 24 (AIPMT 2008, Q122)

    Principles of Inheritance and VariationBotanyMedium
    Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/linkage?
    1. Option A: Down syndrome - 44 autosomes + XO
    2. Option B: Klinefelter syndrome - 44 autosomes + XXY
    3. Option C: Colour blindness - Y-linked
    4. Option D: Erythroblastosis foetalis - X-linked

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  25. Question 25 (AIPMT 2008, Q123)

    Molecular Basis of InheritanceBotanyEasy
    In DNA molecules
    1. Option A: There are two strands which run antiparallel - one in 5'→3' direction and the other in 3'→5' direction
    2. Option B: The total amount of purine nucleotides and pyrimidine nucleotides is not always equal
    3. Option C: There are two strands which run parallel in the 5'→3' direction
    4. Option D: The proportion of adenine in relation to thymine varies with the organism

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  26. Question 26 (AIPMT 2008, Q124)

    Principles of Inheritance and VariationBotanyMedium
    What is true about the isolated small tribal populations?
    1. Option A: There is no change in population size as they have a large gene pool
    2. Option B: There is a decline in population as boys marry girls only from their own tribe
    3. Option C: Hereditary diseases like colour blindness do not spread in the isolated population
    4. Option D: Wrestlers who develop strong body muscles in their life time pass this character on to their progeny

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  27. Question 27 (AIPMT 2008, Q125)

    Principles of Inheritance and VariationBotanyEasy
    Which one of the following scientist's name is correctly matched with the theory put forth by him?
    1. Option A: Mendel - Theory of Pangenesis
    2. Option B: Weismann - Theory of continuity of Germplasm
    3. Option C: Pasteur - Inheritance of acquired characters
    4. Option D: de Vries - Natural selection

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  28. Question 28 (AIPMT 2008, Q126)

    EvolutionZoologyMedium
    Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin of life?
    1. Option A: They could maintain an internal environment
    2. Option B: They were able to reproduce
    3. Option C: They could separate combinations of molecules from the surroundings
    4. Option D: They were partially isolated from the surroundings

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  29. Question 29 (AIPMT 2008, Q127)

    Principles of Inheritance and VariationBotanyEasy
    Darwin's Finches are an excellent example of
    1. Option A: Connecting links
    2. Option B: Adaptive radiation
    3. Option C: Seasonal migration
    4. Option D: Brood parasitism

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  30. Question 30 (AIPMT 2008, Q128)

    Structural Organisation in AnimalsZoologyMedium
    Which one of the following pairs of items correctly belongs to the category of organs mentioned against it?
    1. Option A: Wings of honey-bee and wings of crow - Homologous organs
    2. Option B: Thorn of Bougainvillea and tendrils of Cucurbita - Analogous organs
    3. Option C: Nictitating membrane and blind spot in human eye - Vestigial organs
    4. Option D: Nephridia of earthworm and Malpighian tubules of cockroach - Excretory organs

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  31. Question 31 (AIPMT 2008, Q129)

    Structural Organisation in AnimalsZoologyMedium
    The fruit is chambered, developed from an inferior ovary and has seeds with succulent testa in
    1. Option A: Cucumber
    2. Option B: Pomegranate
    3. Option C: Orange
    4. Option D: Guava

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  32. Question 32 (AIPMT 2008, Q130)

    Photosynthesis in Higher PlantsBotanyMedium
    The C4_4 plants are photosynthetically more efficient than C3_3 plants because
    1. Option A: They have more chloroplasts
    2. Option B: The CO2_2 compensation point is more
    3. Option C: CO2_2 generated during photorespiration is trapped and recycled through PEP carboxylase
    4. Option D: The CO2_2 efflux is not prevented

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  33. Question 33 (AIPMT 2008, Q131)

    Cell: The Unit of LifeBotanyMedium
    The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because
    1. Option A: There is a change in the permeability of the inner mitochondrial membrane toward adenosine diphosphate (ADP)
    2. Option B: High energy bonds are formed in mitochondrial proteins
    3. Option C: ADP is pumped out of the matrix into the intermembrane space
    4. Option D: A proton gradient forms across the inner membrane

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  34. Question 34 (AIPMT 2008, Q132)

    Structural Organisation in AnimalsZoologyMedium
    Dry indehiscent single-seeded fruit formed from a bicarpellary syncarpous inferior ovary is
    1. Option A: Cremocarp
    2. Option B: Caryopsis
    3. Option C: Cypsela
    4. Option D: Berry

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  35. Question 35 (AIPMT 2008, Q133)

    Photosynthesis in Higher PlantsBotanyMedium
    The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of
    1. Option A: Transpiration pull
    2. Option B: Lignified thick walls
    3. Option C: Cohesion and adhesion
    4. Option D: Weak gravitational pull

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  36. Question 36 (AIPMT 2008, Q134)

    Plant Growth and DevelopmentBotanyMedium
    Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in
    1. Option A: Floral parts
    2. Option B: Vessels and tracheid differentiation
    3. Option C: Leaf abscission
    4. Option D: Annual plants

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  37. Question 37 (AIPMT 2008, Q135)

    Structural Organisation in AnimalsZoologyEasy
    Vascular tissues in flowering plants develop from
    1. Option A: Dermatogen
    2. Option B: Phellogen
    3. Option C: Plerome
    4. Option D: Periblem

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  38. Question 38 (AIPMT 2008, Q136)

    Photosynthesis in Higher PlantsBotanyMedium
    In leaves of C4_4 plants malic acid synthesis during CO2_2 fixation occurs in
    1. Option A: Guard cells
    2. Option B: Epidermal cells
    3. Option C: Mesophyll cells
    4. Option D: Bundle sheath

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  39. Question 39 (AIPMT 2008, Q137)

    Plant Growth and DevelopmentBotanyEasy
    Importance of day length in flowering of plants was first shown in
    1. Option A: Petunia
    2. Option B: Lemna
    3. Option C: Tobacco
    4. Option D: Cotton

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  40. Question 40 (AIPMT 2008, Q138)

    Sexual Reproduction in Flowering PlantsBotanyEasy
    Endosperm is consumed by the developing embryo in the seed of
    1. Option A: Maize
    2. Option B: Coconut
    3. Option C: Castor
    4. Option D: Pea

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  41. Question 41 (AIPMT 2008, Q139)

    Microbes in Human WelfareBotanyEasy
    Nitrogen fixation in root nodules of Alnus is brought about by
    1. Option A: Azorhizobium
    2. Option B: Bradyrhizobium
    3. Option C: Clostridium
    4. Option D: Frankia

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  42. Question 42 (AIPMT 2008, Q140)

    Respiration in PlantsBotanyEasy
    The energy releasing process in which the substrate is oxidised without an external electron acceptor is called
    1. Option A: Glycolysis
    2. Option B: Fermentation
    3. Option C: Photorespiration
    4. Option D: Aerobic respiration
    Show answer & explanation

    Correct answer: (B) Fermentation

    Explanation

    Fermentation is an anaerobic energy-yielding process in which the substrate is oxidized without the participation of an external electron acceptor. The electrons removed from the substrate are ultimately accepted by an organic molecule derived from the same substrate, regenerating NAD⁺ and allowing glycolysis to continue.

  43. Question 43 (AIPMT 2008, Q141)

    Structural Organisation in AnimalsZoologyMedium
    Replum is present in the ovary of flower of
    1. Option A: Pea
    2. Option B: Lemon
    3. Option C: Mustard
    4. Option D: Sunflower

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  44. Question 44 (AIPMT 2008, Q142)

    Structural Organisation in AnimalsZoologyEasy
    The fleshy receptacle of syconus of fig encloses a number of
    1. Option A: Mericarps
    2. Option B: Achenes
    3. Option C: Samaras
    4. Option D: Berries

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  45. Question 45 (AIPMT 2008, Q143)

    Photosynthesis in Higher PlantsBotanyMedium
    Electrons from excited chlorophyll molecule of photosystem II are accepted first by
    1. Option A: Ferredoxin
    2. Option B: Cytochrome-b
    3. Option C: Cytochrome-f
    4. Option D: Quinone

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  46. Question 46 (AIPMT 2008, Q144)

    Body Fluids and CirculationZoologyEasy
    Which type of white blood cells are concerned with the release of histamine and the natural anticoagulant heparin?
    1. Option A: Monocytes
    2. Option B: Neutrophils
    3. Option C: Basophils
    4. Option D: Eosinophils

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  47. Question 47 (AIPMT 2008, Q145)

    Structural Organisation in AnimalsZoologyMedium
    Which one of the following is the true description about an animal concerned?
    1. Option A: Cockroach - 10 pairs of spiracles (2 pairs on thorax and 8 pairs on abdomen)
    2. Option B: Earthworm - The alimentary canal consists of a sequence of pharynx, oesophagus, stomach, gizzard and intestine
    3. Option C: Frog - Body divisible into three regions - head, neck and trunk
    4. Option D: Rat - Left kidney is slightly higher in position than the right one

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  48. Question 48 (AIPMT 2008, Q146)

    Body Fluids and CirculationZoologyMedium
    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?
    1. Option A: Option 1
    2. Option B: Option 2
    3. Option C: Option 3
    4. Option D: Option 4

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  49. Question 49 (AIPMT 2008, Q147)

    Breathing and Exchange of GasesZoologyMedium
    What is vital capacity of our lungs?
    1. Option A: Total lung capacity minus residual volume
    2. Option B: Inspiratory reserve volume plus tidal volume
    3. Option C: Total lung capacity minus expiratory reserve volume
    4. Option D: Inspiratory reserve volume plus expiratory reserve volume

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  50. Question 50 (AIPMT 2008, Q148)

    Neural Control and CoordinationZoologyMedium
    Which one of the following is the correct difference between Rod Cells and Cone Cells of our retina?
    1. Option A: Option 1
    2. Option B: Option 2
    3. Option C: Option 3
    4. Option D: Option 4

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  51. Question 51 (AIPMT 2008, Q149)

    Structural Organisation in AnimalsZoologyEasy
    Which one of the following items gives its correct total number?
    1. Option A: Cervical vertebrae in humans - 8
    2. Option B: Floating ribs in humans - 4
    3. Option C: Amino acids found in proteins - 16
    4. Option D: Types of diabetes - 3

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  52. Question 52 (AIPMT 2008, Q150)

    Neural Control and CoordinationZoologyHard
    Given below is a diagrammatic cross section of a single loop of human cochlea. Which one of the following options correctly represents the names of three different parts?
    1. Option A: A : Perilymph, B : Tectorial membrane, C : Endolymph
    2. Option B: B : Tectorial membrane, C : Perilymph, D : Secretory cells
    3. Option C: C : Endolymph, D : Sensory hair cells, A : Serum
    4. Option D: D : Sensory hair cells, A : Endolymph, B : Tectorial membrane

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  53. Question 53 (AIPMT 2008, Q151)

    Reproductive HealthZoologyMedium
    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.
    1. Option A: A-(b), B-(c), C-(a), D-(d)
    2. Option B: A-(c), B-(a), C-(d), D-(b)
    3. Option C: A-(d), B-(a), C-(b), D-(c)
    4. Option D: A-(c), B-(d), C-(a), D-(b)

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  54. Question 54 (AIPMT 2008, Q152)

    Body Fluids and CirculationZoologyMedium
    What will happen if the secretion of parietal cells of gastric glands is blocked with an inhibitor?
    1. Option A: Enterokinase will not be released from the duodenal mucosa and so trypsinogen is not converted to trypsin
    2. Option B: Gastric juice will be deficient in chymosin
    3. Option C: Gastric juice will be deficient in pepsinogen
    4. Option D: In the absence of HCl secretion, inactive pepsinogen is not converted into the active enzyme pepsin

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  55. Question 55 (AIPMT 2008, Q153)

    Neural Control and CoordinationZoologyMedium
    During the propagation of a nerve impulse, the action potential results from the movement of
    1. Option A: Na⁺ ions from extracellular fluid to intracellular fluid
    2. Option B: K⁺ ions from extracellular fluid to intracellular fluid
    3. Option C: Na⁺ ions from intracellular fluid to extracellular fluid
    4. Option D: K⁺ ions from intracellular fluid to extracellular fluid

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  56. Question 56 (AIPMT 2008, Q154)

    Chemical Coordination and IntegrationZoologyEasy
    The blood calcium level is lowered by the deficiency of
    1. Option A: Calcitonin
    2. Option B: Parathormone
    3. Option C: Thyroxine
    4. Option D: Both Calcitonin and Parathormone

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  57. Question 57 (AIPMT 2008, Q155)

    Body Fluids and CirculationZoologyEasy
    The most active phagocytic white blood cells are
    1. Option A: Neutrophils and monocytes
    2. Option B: Neutrophils and eosinophils
    3. Option C: Lymphocytes and macrophages
    4. Option D: Eosinophils and lymphocytes

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  58. Question 58 (AIPMT 2008, Q156)

    Structural Organisation in AnimalsZoologyEasy
    Earthworms have no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic skeleton. It is due to
    1. Option A: Setae
    2. Option B: Coelomic fluid
    3. Option C: Blood
    4. Option D: Gut peristalsis

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  59. Question 59 (AIPMT 2008, Q157)

    Body Fluids and CirculationZoologyMedium
    In humans, blood passes from the post caval vein to the diastolic right atrium of heart due to
    1. Option A: Pressure difference between the post caval vein and atrium
    2. Option B: Pushing open of the venous valves
    3. Option C: Suction pull
    4. Option D: Stimulation of the sinoatrial node

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  60. Question 60 (AIPMT 2008, Q158)

    Human ReproductionZoologyEasy
    In humans, at the end of the first meiotic division, the male germ cells differentiate into
    1. Option A: Spermatogonia
    2. Option B: Primary spermatocytes
    3. Option C: Secondary spermatocytes
    4. Option D: Spermatids

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  61. Question 61 (AIPMT 2008, Q159)

    Sexual Reproduction in Flowering PlantsBotanyEasy
    Which one of the following is resistant to enzyme action?
    1. Option A: Leaf cuticle
    2. Option B: Cork
    3. Option C: Wood fibre
    4. Option D: Pollen exine

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  62. Question 62 (AIPMT 2008, Q160)

    Structural Organisation in AnimalsZoologyEasy
    The length of different internodes in a culm of sugarcane is variable because of
    1. Option A: Intercalary meristem
    2. Option B: Shoot apical meristem
    3. Option C: Position of axillary buds
    4. Option D: Size of leaf lamina at the node below each internode

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  63. Question 63 (AIPMT 2008, Q161)

    Sexual Reproduction in Flowering PlantsBotanyMedium
    Which one of the following pairs of plant structures has haploid number of chromosomes?
    1. Option A: Egg nucleus and secondary nucleus
    2. Option B: Megaspore mother cell and antipodal cells
    3. Option C: Egg cell and antipodal cells
    4. Option D: Nucellus and antipodal cells

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  64. Question 64 (AIPMT 2008, Q162)

    Sexual Reproduction in Flowering PlantsBotanyMedium
    What does the filiform apparatus do at the entrance into ovule?
    1. Option A: It guides pollen tube from a synergid to egg
    2. Option B: It helps in the entry of pollen tube into a synergid
    3. Option C: It prevents entry of more than one pollen tube into the embryo sac
    4. Option D: It brings about opening of the pollen tube

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  65. Question 65 (AIPMT 2008, Q163)

    Sexual Reproduction in Flowering PlantsBotanyMedium
    Unisexuality of flowers prevents
    1. Option A: Autogamy and geitonogamy
    2. Option B: Autogamy, but not geitonogamy
    3. Option C: Both geitonogamy and xenogamy
    4. Option D: Geitonogamy, but not xenogamy

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  66. Question 66 (AIPMT 2008, Q164)

    Human ReproductionZoologyEasy
    Which extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus?
    1. Option A: Amnion
    2. Option B: Chorion
    3. Option C: Allantois
    4. Option D: Yolk sac

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  67. Question 67 (AIPMT 2008, Q165)

    Human ReproductionZoologyMedium
    Which one of the following statements is incorrect about menstruation?
    1. Option A: The beginning of the cycle of menstruation is called menarche
    2. Option B: During normal menstruation about 40 ml blood is lost
    3. Option C: The menstrual fluid can easily clot
    4. Option D: At menopause in the female, there is especially abrupt increase in gonadotropic hormones

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  68. Question 68 (AIPMT 2008, Q166)

    Breathing and Exchange of GasesZoologyMedium
    The haemoglobin of a human foetus
    1. Option A: Has a higher affinity for oxygen than that of an adult
    2. Option B: Has a lower affinity for oxygen than that of an adult
    3. Option C: Its affinity for oxygen is the same as that of an adult
    4. Option D: Has only 2 protein subunits instead of 4

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  69. Question 69 (AIPMT 2008, Q167)

    Reproductive HealthZoologyHard
    Consider the statements given below regarding contraception and answer as directed thereafter: (a) Medical Termination of Pregnancy (MTP) during first trimester is generally safe (b) Generally chances of conception are nil until mother breast-feeds the infant up to two years (c) Intrauterine devices like Copper-T are effective contraceptives (d) Contraception pills may be taken up to one week after coitus to prevent conception Which two of the above statements are correct?
    1. Option A: a, b
    2. Option B: b, c
    3. Option C: c, d
    4. Option D: a, c

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  70. Question 70 (AIPMT 2008, Q168)

    Chemical Coordination and IntegrationZoologyEasy
    In human adult females oxytocin
    1. Option A: Causes strong uterine contractions during parturition
    2. Option B: Is secreted by anterior pituitary
    3. Option C: Stimulates growth of mammary glands
    4. Option D: Stimulates pituitary to secrete vasopressin

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  71. Question 71 (AIPMT 2008, Q169)

    EcosystemBotanyMedium
    Which one of the following is the correct percentage of the two (out of the total of greenhouse gases) that contribute to the total global warming?
    1. Option A: Methane 20%, N₂O 18%
    2. Option B: CFCs 14%, Methane 20%
    3. Option C: CO₂ 40%, CFCs 30%
    4. Option D: N₂O 6%, CO₂ 86%

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  72. Question 72 (AIPMT 2008, Q170)

    EcosystemBotanyEasy
    Quercus species are the dominant component in
    1. Option A: Tropical rain forests
    2. Option B: Temperate deciduous forests
    3. Option C: Alpine forests
    4. Option D: Scrub forests

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  73. Question 73 (AIPMT 2008, Q171)

    EcosystemBotanyMedium
    About 70% of total global carbon is found in
    1. Option A: Forests
    2. Option B: Grasslands
    3. Option C: Agroecosystems
    4. Option D: Oceans

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  74. Question 74 (AIPMT 2008, Q172)

    EcosystemBotanyMedium
    Which one of the following is not observed in biodiversity hotspots?
    1. Option A: Species richness
    2. Option B: Endemism
    3. Option C: Accelerated species loss
    4. Option D: Lesser inter-specific competition

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  75. Question 75 (AIPMT 2008, Q173)

    EcosystemBotanyEasy
    World Summit on Sustainable Development (2002) was held in
    1. Option A: South Africa
    2. Option B: Brazil
    3. Option C: Sweden
    4. Option D: Argentina

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  76. Question 76 (AIPMT 2008, Q174)

    EcosystemBotanyEasy
    The slow rate of decomposition of fallen logs in nature is due to their
    1. Option A: Low cellulose content
    2. Option B: Low moisture content
    3. Option C: Poor nitrogen content
    4. Option D: Anaerobic environment around them

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  77. Question 77 (AIPMT 2008, Q175)

    EcosystemBotanyMedium
    Consider the following statements concerning food chains: (a) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation (b) Removal of most of the carnivores resulted in an increased population of deer (c) The length of food chains is generally limited to 3-4 trophic levels due to energy loss (d) The length of food chains may vary from 2 to 8 trophic levels Which two of the above statements are correct?
    1. Option A: a, b
    2. Option B: b, c
    3. Option C: c, d
    4. Option D: a, d

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  78. Question 78 (AIPMT 2008, Q176)

    EcosystemBotanyEasy
    According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometres) of the air pollutants is responsible for greatest harm to human health?
    1. Option A: 5.2 - 2.5
    2. Option B: 2.5 or less
    3. Option C: 1.5 or less
    4. Option D: 1.0 or less

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  79. Question 79 (AIPMT 2008, Q177)

    EcosystemBotanyHard
    The table below gives the populations (in thousands) of ten species (A-J) in four areas (a-d) consisting of the number of habitats given within brackets against each. Study the table and answer the question which follows. Which area out of a to d shows maximum species diversity?
    1. Option A: a
    2. Option B: b
    3. Option C: c
    4. Option D: d

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  80. Question 80 (AIPMT 2008, Q178)

    EcosystemBotanyMedium
    A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this: (a) Lots of urea and phosphate fertilizer were used in the crops in the vicinity (b) The area was sprayed with DDT by an aircraft (c) The lake water turned green and stinky (d) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis Which two of the above were the main causes of fish mortality in the lake?
    1. Option A: a, b
    2. Option B: b, c
    3. Option C: c, d
    4. Option D: a, c

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  81. Question 81 (AIPMT 2008, Q179)

    EcosystemBotanyMedium
    Consider the following four statements (a-d) about certain desert animals such as kangaroo rat. (a) They have dark colour and high rate of reproduction and excrete solid urine (b) They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs (c) They feed on dry seeds and do not require drinking water (d) 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?
    1. Option A: a and b
    2. Option B: c and d
    3. Option C: b and c
    4. Option D: c and a

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  82. Question 82 (AIPMT 2008, Q180)

    Biotechnology and Its ApplicationsZoologyEasy
    A transgenic food crop which may help in solving the problem of night blindness in developing countries is
    1. Option A: Golden rice
    2. Option B: Flavr Savr tomatoes
    3. Option C: Starlink maize
    4. Option D: Bt soybean

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  83. Question 83 (AIPMT 2008, Q181)

    Microbes in Human WelfareBotanyEasy
    Bacterial leaf blight of rice is caused by a species of
    1. Option A: Erwinia
    2. Option B: Xanthomonas
    3. Option C: Pseudomonas
    4. Option D: Alternaria

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  84. Question 84 (AIPMT 2008, Q182)

    Microbes in Human WelfareBotanyMedium
    Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide?
    1. Option A: Black rust of wheat
    2. Option B: Bacterial leaf blight of rice
    3. Option C: Downy mildew of grapes
    4. Option D: Loose smut of wheat

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  85. Question 85 (AIPMT 2008, Q183)

    Biotechnology and Its ApplicationsZoologyEasy
    Which one of the following is being tried in India as a biofuel substitute for fossil fuels?
    1. Option A: Aegilops
    2. Option B: Jatropha
    3. Option C: Azadirachta
    4. Option D: Musa

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  86. Question 86 (AIPMT 2008, Q184)

    Microbes in Human WelfareBotanyMedium
    Trichoderma harzianum has proved a useful microorganism for
    1. Option A: Biological control of soil-borne plant pathogens
    2. Option B: Bioremediation of contaminated soils
    3. Option C: Reclamation of wastelands
    4. Option D: Gene transfer in higher plants

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  87. Question 87 (AIPMT 2008, Q185)

    Biotechnology: Principles and ProcessesZoologyEasy
    Gel electrophoresis is used for
    1. Option A: Isolation of DNA molecule
    2. Option B: Cutting of DNA into fragments
    3. Option C: Separation of DNA fragments according to their size
    4. Option D: Construction of recombinant DNA by joining with cloning vectors

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  88. Question 88 (AIPMT 2008, Q186)

    Human Health and DiseaseZoologyEasy
    To which type of barriers under innate immunity do the saliva in the mouth and the tears from the eyes belong?
    1. Option A: Physical barriers
    2. Option B: Cytokine barriers
    3. Option C: Cellular barriers
    4. Option D: Physiological barriers

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  89. Question 89 (AIPMT 2008, Q187)

    Human Health and DiseaseZoologyMedium
    Match the disease in Column I with the appropriate items (pathogen/prevention/treatment) in Column II.
    1. Option A: a-(ii), b-(iii), c-(iv), d-(i)
    2. Option B: a-(i), b-(ii), c-(iii), d-(iv)
    3. Option C: a-(ii), b-(iv), c-(i), d-(iii)
    4. Option D: a-(ii), b-(i), c-(iii), d-(iv)

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  90. Question 90 (AIPMT 2008, Q188)

    Microbes in Human WelfareBotanyHard
    Consider the following statements about biomedical technologies: (a) During open heart surgery blood is circulated in the heart-lung machine (b) Blockage in coronary arteries is removed by angiography (c) Computerised Axial Tomography (CAT) shows detailed internal structures as seen in a section of the body (d) X-ray provides clear and detailed images of organs like prostate glands and lungs Which two of the above statements are correct?
    1. Option A: a and b
    2. Option B: b and d
    3. Option C: c and d
    4. Option D: a and c

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  91. Question 91 (AIPMT 2008, Q189)

    Molecular Basis of InheritanceBotanyMedium
    Which one of the following pairs of codons is correctly matched with their function or the signal for the particular amino acid?
    1. Option A: UUA, UCA - Leucine
    2. Option B: GUU, GCU - Alanine
    3. Option C: UAG, UGA - Stop
    4. Option D: AUG, ACG - Start / Methionine

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  92. Question 92 (AIPMT 2008, Q190)

    Human Health and DiseaseZoologyMedium
    Which one of the following is the correct statement regarding the particular psychotropic drug specified?
    1. Option A: Barbiturates cause relaxation and temporary euphoria
    2. Option B: Hashish causes altered thought perceptions and hallucinations
    3. Option C: Opium stimulates nervous system and causes hallucinations
    4. Option D: Morphine leads to delusions and disturbed emotions

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  93. Question 93 (AIPMT 2008, Q191)

    Biotechnology and Its ApplicationsZoologyEasy
    Cry I endotoxins obtained from Bacillus thuringiensis are effective against
    1. Option A: Boll worms
    2. Option B: Mosquitoes
    3. Option C: Flies
    4. Option D: Nematodes

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  94. Question 94 (AIPMT 2008, Q192)

    Biotechnology and Its ApplicationsZoologyMedium
    Modern detergents contain enzyme preparations of
    1. Option A: Thermophiles
    2. Option B: Acidophiles
    3. Option C: Alkaliphiles
    4. Option D: Thermoacidophiles

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  95. Question 95 (AIPMT 2008, Q193)

    Biotechnology: Principles and ProcessesZoologyEasy
    The linking of antibiotic resistance gene with the plasmid vector became possible with
    1. Option A: Exonucleases
    2. Option B: DNA ligase
    3. Option C: Endonucleases
    4. Option D: DNA polymerase

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  96. Question 96 (AIPMT 2008, Q194)

    Microbes in Human WelfareBotanyMedium
    Which one of the following proved effective for biological control of nematodal disease in plants?
    1. Option A: Paecilomyces lilacinus
    2. Option B: Pisolithus tinctorius
    3. Option C: Pseudomonas cepacia
    4. Option D: Gliocladium virens

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  97. Question 97 (AIPMT 2008, Q195)

    Biotechnology and Its ApplicationsZoologyMedium
    Main objective of production/use of herbicide resistant GM crops is to
    1. Option A: Reduce herbicide accumulation in food articles for health safety
    2. Option B: Eliminate weeds from the field without the use of manual labour
    3. Option C: Eliminate weeds from the field without the use of herbicides
    4. Option D: Encourage eco-friendly herbicides

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  98. Question 98 (AIPMT 2008, Q196)

    Microbes in Human WelfareBotanyMedium
    Consider the following four measures (a-d) that could be taken to successfully grow chick-pea in an area where bacterial blight disease is common: (a) Spray with Bordeaux mixture (b) Control of the insect vector of the disease pathogen (c) Use of only disease-free seeds (d) Use of varieties resistant to the disease Which two of the above measures can control the disease?
    1. Option A: (a) and (d)
    2. Option B: (b) and (c)
    3. Option C: (a) and (b)
    4. Option D: (c) and (d)

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  99. Question 99 (AIPMT 2008, Q197)

    Biotechnology and Its ApplicationsZoologyEasy
    Human insulin is being commercially produced from a transgenic species of
    1. Option A: Saccharomyces
    2. Option B: Escherichia
    3. Option C: Mycobacterium
    4. Option D: Rhizobium

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  100. Question 100 (AIPMT 2008, Q198)

    Human Health and DiseaseZoologyEasy
    Cornea transplant in humans is almost never rejected. This is because
    1. Option A: It is a non-living layer
    2. Option B: Its cells are least penetrable by bacteria
    3. Option C: It has no blood supply
    4. Option D: It is composed of enucleated cells

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  101. Question 101 (AIPMT 2008, Q199)

    Chemical Coordination and IntegrationZoologyMedium
    Which of the following pairs of organs includes only the endocrine glands?
    1. Option A: Adrenal and Ovary
    2. Option B: Parathyroid and Adrenal
    3. Option C: Pancreas and Parathyroid
    4. Option D: Thymus and Testes

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  102. Question 102 (AIPMT 2008, Q200)

    Biotechnology and Its ApplicationsZoologyMedium
    What is antisense technology?
    1. Option A: RNA polymerase producing DNA
    2. Option B: A cell displaying a foreign antigen used for synthesis of antigens
    3. Option C: Production of somaclonal variants in tissue cultures
    4. Option D: When a piece of RNA that is complementary in sequence is used to stop expression of a specific gene

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