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PPSC Biology Lecturer Solved Past Papers
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Q NO 1. The amphibians and the __________ represent the two major branches of the tetrapod lineage
A: reptiles
B: birds
C: temnospondyls
D: amniotes
Q NO 2. Which of the following statements about hair is true
A: it is homologous to feathers
B: it is a dermal structure
C: it is found in all mammals
D: it is possessed by all endotherms
Q NO 3. Approximately how many species of fish are known?
A: 28,000
B: 5,000
C: 10,000
D: 50,000
Q NO 4. The endoskeleton of the echinoderms is composed of
A: keratin ossicles
B: calcareous ossicles
C: keratin spicules
D: calcareous spicules
Q NO 5. The first hormone that was isolated
A: thyroxine
B: vasopressin
C: secretin
D: adrenaline
Q NO 6. The ultimate source of organic variations is
A: sexual reproduction
B: hormonal action
C: natural selection
D: mutation
Q NO 7. Which one of the following is a group of major green housegases
A: carbon dioxide, methane, chlorofluro carbons and oxides of nitrogen
B: ethane, oxides of nitrogen, carbon monoxide and chlorofluro carbons
C: carbon monoxide, methane, chlorofluro carbons and oxides of nitrogen
D: carbon dioxide, oxides of nitrogen, ethane and chlorofluro carbons
Q NO 8. The structure of molluscs that forms the shell and houses the gills is the
A: mantle
B: epidermis
C: gastrovascular cavity
D: odontophore
Q NO 9. In an ecosystem, which one shows one way passage?
A: nitrogen
B: carbon
C: potassium
D: free energy
Q NO 10. The central fluid filled cavity of the blastula is known as
A: archenteron
B: blastocoel
C: blastocyst
D: morula
Q NO 11. The mammalian skull may be characterized as ____
A: anapsid
B: diapsid
C: biaspid
D: synapsid
Q NO 12. The first terrestrial tetrapods were probably the
A:rhipidistians
B: amniotes
C: coelacanths
D: leptocephalans
Q NO 13. Which of the following phyla of animals is exclusively marine
A: protozoa
B: porifera
C:echinodermata
D: mollusca
Q NO 14. A normal green male Maize is crossed with albino female. The progeny is albino because
A: trait for a albinism is dominant
B: the albinos have biochemical to destroy plastids derived from green male
C: plastids are inherited from female parent
D: green plastids of male must have mutated
Q NO 15. Sertoli cells are found in
A: liver
B: seminiferous tubules
C: pancreas
D: gut
Q NO 16. The sum total of the populations of the same kind of organisms constitute
A: colony
B: genus
C: species
D: community
Q NO 17. A molluscan shell is made of three layers arranged from the outside to the inside
A:periostracum, prismatic layer, nacreous layer
B: mantle layer, prismatic layer, periostracum
C: nacreous layer, periostracum, mantle layer
D: none of these
Q NO 18. Which one of the following can achieve protection and conservation of biodiversity
A: eco-development
B: biosphere reserve
C: national park
D: game sanctuary
Q NO 19. Lamarck’s “Theory of Organic Evolution” is based upon
A: effect of environment
B: use and disuse of body parts
C: inheritance of acquired characters
D: all of these
Q NO 20. Myxoedema in adults is caused due to
A: hyperthyrodism
B: deficiency of thyroid hormone
C: overproduction of PTH
D: deficiency of PTH
Q NO 21. “The animals of colder countries have small ears, short tail and limbs to avoid more loss of heat” is the theme of
A: Allen’s law
B: Dollo’s law
C: Gause’s law
D: Cope’s Law
Q NO 22. Testosterone is secreted by
A: sertoli cells
B:leydig cells
C: spermatocyte
D:histiocyte
Q NO 23. Changing from a bilaterally symmetrical larval form to a radially symmetrical adult involves relocation of various parts. In this process, the left side becomes the ___________________ and the right side becomes the _____________________
A: aboral surface, oral surface
B: anterior surface, posterior surface
C: dorsal surface, ventral surface
D: oral surface, aboral surface
Q NO 24. The class name Myxini, or the hagfishes, refers to their
A: lack of eyes
B: unique circulatory system
C: production of slime
D: parasitic lifestyle
Q NO 25. The earliest therians (mammals) evolved in the ____
A: Permian
B: Triassic
C: Cretaceous
D: Cenozoic
Q NO 26. The development of limbs probably aided the first amphibians in
A: finding mates
B: swimming
C: moving between bodies of water
D: none of these
Q NO 27. Which of the following is odd one
A: cockroach, spider, silver-fish
B: whale, bat, lizard
C: star-fish, sea-cucumber, sea-urchin
D: cray-fish, cuttle-fish hag-fish
Q NO 28. ABO blood group system is due to
A: multifactor inheritance
B: incomplete dominance
C: multiple allelism
D: epistasis
Q NO 29. In human beings, the eggs are
A: microlecithal
B: macrolecithal
C:mesolecithal
D: alecithal
Q NO 30. Pyramid of numbers deal with number of
A: species in area
B: sub-species in a community
C: individuals in a community
D: individuals in a trophic level
Q NO 31. The morphogenetic movement change the hollow spherical blastula into a/an
A: embryonic disc
B: gastrula
C: morula
D: neurula
Q NO 32. The dominant second trophic level, in a lake ecosystem, is
A: benthos
B: plankton
C: zooplankton
D: phytoplankton
Q NO 33. Which of the following classes of molluscs is thought to be the most primitive or closest to the ancestral form
A:caudofoveata
B: solenogastres
C: monoplacophora
D: polyplacophora
Q NO 34. Similar niches different communalities or in different regions are commonly occupied by species possessing similar habits, adaptations and adjustments, Such species are called
A: ecological equivalents
B: ecotypes
C: ecological dominants
D: diverse species
Q NO 35. Best suited examples given in favour of Lamarckian Theory are
A: elongation of neck and fore limbs of African giraffe
B: loss of limbs in snakes
C: both (a) and (b)
D: none of these
Q NO 36. Diabetes mellitus is due to deficiency of
A: LH
B: FSH
C: glucagon
D: insulin
Q NO 37. Which of these classes is characterized by no anus, no suckers, articulated ossicles, and a madreporite on the oral surface
A: crinoidea
B:ophiuroidea
C: asteroidea
D: echinoidea
Q NO 38. The derivation of the genus name assigned to the invasive marine lampreys found in theGreat Lakes refers to their
A: ability to be parthenogenetic
B: rasping mouthparts
C: holding on to rocks in a stream
D: parasitic nature
Q NO 39. Unlike reptiles, the first mammals were characterized by ____
A: continuously replaced teeth
B: only one set of teeth during the lifetime
C: continuously growing teeth
D: two sets of teeth during the lifetime
Q NO 40. Some amphibians have _________, which are pigmented cells in the skin
A:chromatophores
B: osteoblasts
C: miracidia
D: none of these
Q NO 41. The hearts of amphibians have
A: one atria and one ventricle
B: two atria and one ventricle
C: one atria and two ventricles
D: two atria and two ventricles
Q NO 42. Blue eye colour is recessive to brown eye colour. A brown eyed man whose mother was blue eyed marries a blue-eyed woman. The children will be
A: both blue eyed and brown eyed 1 : 1
B: all brown eyed
C: all blue eyed
D: none of these
Q NO 43. Implantation of blastocyst occurs
A: 4th day
B: 5th day
C: 6th day
D: 7th day
Q NO 44. Which of the following structures do bivalves use in the process of digestion?
A: byssal threads
B: peristaltic muscles
C: a crystalline style
D: a jaw
45. Ratios between energy flow at different points along the food chains when expressed as percentages, are called
A: energy flow efficiencies
B: ecological efficiencies
C: relative ratio of energy flow
D: ecological gradients
Q NO 46. Productivity is the amount of organic matter produced
A: per day
B: per unit area per unit time
C: during photo-period of the day
D: per unit area in twelve hours of photo period
Q NO 47. Which of the following facts definitely casts doubt on Lamarckian theory
A: snakes lost their limbs due to burrowing mode of life
B: neck and fore limbs of African giraffe use for generations
C: vestigial organs were functional ones but now undergone degeneration due to loss of their function
D: blacksmith’s son does not have powerful arm muscles as his father
Q NO 48. Oxytocin stimulates the contraction of
A: ovary
B: lung
C: uterus
D: heart
Q NO 49. Aristotle’s lantern is a complex set of ________ used in the process of
A:ossicles and muscles, chewing
B: tentacles and cilia, reproduction
C: glands and muscles, digestion
D: neurons and ocelli, visual sensation
Q NO 50. The structure in the intestine of chondroitin fish and some primitive osteichthyean fish that increases the surface area is the
A: duodenum
B: jejunum
C: caecum
D: spiral valve
Q NO 51. Which of the following groups of animals has a cellular or unicellular body
A: porifera
B: protozoa
C: eumetazoa
D: cnidaria
Q NO 52. Which contribute to the success of Mendel
A: qualitative analysis of data
B: observation of distinct inherited traits
C: *his knowledge of biology
D: consideration of one character at one time
Q NO 53. Genetic identity of a human male is determined by
A: autosomes
B: nucleolus
C: cell organelles
D: sex chromosomes
Q NO 54. Upper part of sea or aquatic ecosystem contains
A: plankton
B: nekton
C: benthos
D: plankton and nekton
Q NO 55. The structure that is used for feeding in most molluscs is the
A: buccal cavity
B: radula
C: mouth
D: odontophore
Q NO 56. Which one of the following pairs is not correctly matched
A: cursorial adaptations – Limb bones elongated
B: fossorial adaptations – Develops shoulder girdle
C: arboreal adaptations – Webbed feet
D: volant adaptations – Fusion of certain bones
Q NO 57. Lamarck’s theory of organic evolution was published in the book entitled
A: Systima Naturee
B: Philosophic Zoologique
C: Origin of species
D: none of these
Q NO 58. Metabolic rate in mammals is controlled by
A: pancreas
B: thyroid
C: pituitary
D: liver
Q NO 59. The ambulacral groove is found between the
A: rows of tube feet
B: radial nerves
C: layers of pedicellariae
D: rows of dermal ossicles
Q NO 60. The agnathans and gnathostomes branched apart most likely during the
A:cambrian period
B: silurian period
C: devonian period
D: jurassic period
Q NO 61. Many echinoderms have two parts to the stomach, these two parts are the
A: enzymatic, cecal
B: cecal, cardiac
C: cardiac, pyloric
D: pyloric, enzymatic
Q NO 62. Which of the following fish may be characterized as eel-like, parasitic, and possessing a cartilaginous skeleton
A: chimera
B: hag fish
C: lamprey
D: ostracoderm
Q NO 63. Which of the following evolved from a group of carnivorous pelycosaurs
A:therapsids
B: labyrinthodonts
C: anurans
D: theropods
Q NO 64. The freshwater fish that survived the Devonian period possessed
A: efficient gills
B: lungs
C: countercurrent flow
D: paedomorphosis
Q NO 65. Which of the following groups of animals has no parasites
A: platyhelminthes
B: nematoda
C: porifera
D:echinodermata
Q NO 66. tt mates with Tt. What will be characteristic of offspring
A: 75% recessive
B: 50% recessive
C: 25% recessive
D: all dominant
Q NO 67. Fertilizin is a chemical substance produced from
A: mature eggs
B: acrosome
C: polar bodies
D: middle piece of sperm
Q NO 68. Association of animals when both partners are benefited
A: colony
B: commensalism
C: ammensalism
D: mutualism
Q NO 69. The trochophore larva indicates a common ancestry for which of the following pairs
A: Mollusca-Annelida
B: Mollusca-Cnidaria
C: Mollusca-Cephalopoda
D: Mollusca-Nematoda
Q NO 70. The desert animals confine their activities during night time, because they
A: can see well during the night
B: get sufficient food during night
C: have a problem of conservation of water during the day time
D: face less competition for food during night
Q NO 71. The characters of no shell, integumental scales, a reduced head and being dioecious describes which of the following molluscs
A:caudofoveata
B: solenogastres
C: monoplacophora
D: polyplacophora
Q NO 72. What is the correct sequence of zonation in the lentic environment (i) Profundal zone (ii) Sub-littoral zone (iii) Littoral zone
A: i, ii, iii
B: i, iii, ii
C: ii, iii, i
D: iii, ii, i
Q NO 73. Which of the following facts make Lamarckism doubtful
A: neck of giraffe elongated for grazing from high trees
B: trees of high altitudes have sloppy branches to avoid deposition of snow
C: deer is fast runner for protection from predators
D:Indian ladies have been getting their ears pierced since ages but pierced ears are not inherited
Q NO 74. HCG is secreted by
A: placenta
B: ovary
C: thymus
D: thyroid
Q NO 75. The echinoderms have developed the ability to exploit many sources of fooD: The sea stars are _____________, the sea urchins are ________________, and the sea cucumbers are ______________.
A: planktivores, herbivores, worms
B: carnivores, herbivores, deposit feeders
C: herbivores, detritivores, algae
D: detritivores, carnivores, plankton
Q NO 76. The respiratory apparatus of agnathans may be characterized by
A: lack of gill filaments
B: lack of an operculum
C: the presence of a spiracle
D: acting as a filter feeding mechanism
Q NO 77. The early therians most resembled a small ____
A: pig
B: kangaroo
C: rat
D: horse
Q NO 78. The first well-known fossil of a tetrapod was ____
A: in the genus Sphenodon
B: in the genus Latimeria
C: in the genus Ichthyostega
D: in the genus Desmognathus
Q NO 79. In a genetic cross having recessive epistasis, F2 phenotypic ratio would be
A: 9:6:1
B: 15:1
C: 9:3: 4
D: 12:3:1
Q NO 80. Cross between AaBB and aaBB will form
A: 1 AaBB :laaBB
B: All AaBB
C: 3AaBB : laaBB
D: 1 AaBB : 3aaBB
Q NO 81. RR (Red) Antirrhinum is crossed with white (WW) one. Offspring RW are pink. This is an example of
A: dominant-recessive
B: incomplete dominance
C: hybrid
D: supplementary genes
Q NO 82. In humans, the placenta is
A:haemochorial
B: endothelial
C: epitheliochorial
D: syndesmochorial
Q NO 83. Gastropoda taxonomy is currently under consideration. The traditional three subclasses are Prosobranchia, and two others
A: Nudibranchia, Pelycopoda
B: Pelycopoda, Opisthobranchia
C:Opisthobranchia, Pulmonata
D: Pulmonata, Nudibranchia
Q NO 84. The monoplacophorans were known only from the fossil record until 1952 when ________ emerged from a deep-sea trawl net
A: specimens of Loligo
B: specimens of Mopalia
C: specimens of Pedicularia
D: specimens of Neopilina
Q NO 85. Which one of the following statements is not true about energy flow
A: energy flow is greatly reduced at each successive trophic level from producers to herbivores and then to carnivores
B: the energy captured by the autotrophs does not revert back to solar input
C: there is unidirectional flow of energy
D: the pyramids of energy are both top right and inverted
Q NO 86. Neck and fore limbs in African giraffe increased in length as a result of
A: variation in these organs
B: mutations in these organs
C: use and disuse
D: none of these
Q NO 87. Cushing syndrome is due to the hyper secretion of
A: thyroid
B: adrenal cortex
C: pituitary
D: none of these
Q NO 88. Which of these classes is characterized by an endoskeletal test, a complex chewing apparatus, no arms, pedicellaria with three jaws, closed ambulacral grooves, and movable spines
A:echinoidea
B: asteroidea
C: ophiuroidea
D: crinoidea
Q NO 89. The larva of the lamprey is known as the
A: trilobite larva
B: veliger
C:ammocete
D: tornaria
Q NO 90. The implied presence of sebaceous and sweat glands in early mammals signified what
A: fossilized casts
B: hair
C: epidermis
D: none of these
Q NO 91. The adaptive radiation of the mammals occurred during the ____
A: triassic
B: jurassic
C: cretaceous
D:cenozoic
Q NO 92. To facilitate cutaneous respiration, the skin of amphibians is
A: moist and covered with scales
B: moist and richly vascularized
C: dry and richly vascularized
D: dry and covered with scales
Q NO 93. The kidneys of amphibians are
A: pronephric
B: metanephric
C: mesonephric
D: anephric
Q NO 94. Members of the order ________ often produce spermatophores
A:urodela
B: gymnophiona
C: apoda
D: anura
Q NO 95. A dihybrid condition is
A: segregation
B: dominance
C: independent assortment
D: polygenic inheritance
Q NO 96. Torsion is a process that rotates the _________ of the body of gastropods
A: surface
B: mantle
C: viscera
D: none of these
Q NO 97. The total output of photosynthesis, including the organic matter used up in respiration during the period of measurement, is called
A: net primary productivity
B: gross primary productivity
C: net community productivity
D: secondary productivity
Q NO 98. In the animal kingdom, several degree of interspecific interactions can be recognized:Which one of the following is true for protocooperation interactions?
A: both partners gain but neither can survive without the other
B: one of the species is harmed by the relationship
C: presence of one species appears to have no effect on a second species
D: both partners gain, though each is able to survive separately
Q NO 99. Which of the following concepts is attributed to Lamarck
A: inheritance of acquired characters
B: survival of the fittest
C: struggle for existence
D: none of these
Q NO 100. Goiter is caused by
A: excess secretion of thyroxin
B: deficiency of iodine
C: over eating
D: deficiency of growth hormone