PPSC Lecturer Biology Solved Past Papers | PPSC Lecturer Biology 2022 Paper 1

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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


B: amniotes

C: coelacanths

D: leptocephalans

Q NO 13. Which of the following phyla of animals is exclusively marine

A: protozoa

B: porifera


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


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


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


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



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


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


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


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


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


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


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


B: asteroidea

C: ophiuroidea

D: crinoidea

Q NO 89. The larva of the lamprey is known as the

A: trilobite larva

B: veliger


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


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


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