#1. Important characteristic that hemichordates share with chordates is
(b) : An important characteristics that
hemichordates and chorddates share is presence of
pharyngeal gill slits. Gill slits are dorsal in position
in hemichordates whereas they are lateral in chordates.
A true unotochord does not occur in hemichordates.
Nervous system is distinctly of vertebrate type being
intraepidermal in position and having a ventral nerve
#2. Which among these is the correct combination of aquatic mammals?
(b) : Whales, dolphin and seals are examples of
aquatic mammals. Trygon and sharks are cartilaginous
#3. Which of the following represents order of ‘Horse’?
(a) : Perissodactyla represents the order of horse.
Equidae is the family, caballus is the subspecies
whereas E. ferus is the species of horse.
#4. In case of poriferans, the spongocoel is lined with flagellated cells called
(b) : Spongocoel is the central body cavity of the
sponges. It is lined by highly specialised flagellated
cells called choanocytes
#5. Choose the correct statement.
(b) : Ornithorhynchus and Tachyglossus are
oviparous mammals. Crocodile is a reptile which
possesses four chambered heart. In cartilaginous fish
(except Chimaera) gills are not covered by an oper
#6. Which one of the following characteristics is not shared by birds and mammals?
(a) : All birds are oviparous while all mammals
except Ornithorhyncus (duck billed platypus) and
Echidna or Tachyglossus (spiny anteater) are
#7. Which of the following features is not present in the Phylum Arthropoda?
(a) : Parapodia are flattened, fleshy, vertical flap
like outgrowths of body wall found in annelids on
lateral sides of trunk segments. These are hollow
structures enclosing coelom which is continuous with
that of trunk segments. These serve the dual purpose
of locomotion and respiration.
#8. Body having meshwork of cells, internal cavities lined with food filtering flagellated cells and indirect development are the characteristics of Phylum
(d) : Phylum Porifera (the sponges) has cellular
level of body organisation, with inner cellular layer
consisting of highly specialised flagellated cells called
choanocytes (or collar cells). The development in this
phylum is indirect as it includes a free swimming larva
called amphiblastula or parenchymula for dispersal
of the species.
#9. Metagenesis refers to
(d) : An alternation of generation between
asexual and sexual phases of an organism is referred
to as metagenesis. E.g. in Obelia (a coelenterate),
polyps reproduce asexually and medusae reproduce
#10. A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorpho sis return to the ocean is
(b) : Petromyzon (Lamprey) belongs to the Class
Cyclostomata of PhylumChordata. It is a jawless fish
which lays eggs in fresh water. The eggs hatch in about
3 weeks into minute transparent larvae called
ammocoetes. After metamorphosis, the young lam
preys swim down to the sea where they remain for 3
or 4 years before reaching maturity, when they once
again migrate to streams or rivers to spawn and die.
Gonads become mature at that time when adults re
turn to rivers for spawning.
#11. Which of the following endoparasites of humans does show viviparity?
(a) : Trichinella spiralis is a minute nematode
parasite that shows viviparity i.e., produces live
youngs (larvae) not eggs. The adults of T. spiralis
live in the human small intestine, where the females
release large numbers of larvae. These larvae bore
through the intestine and can cause trichinosis or
trichiniasis which has symptoms like diarrohea,
nausea, vertigo, pain in limbs and fever etc.
Humans get infected after eating imperfectly cooked
meat infected with the parasite’s larval cysts.
#12. Which of the following animals is not vivipa rous?
(a) : Duckbilled platypus is an egg laying
mammal. It is found in the rivers in eastern Australia
and Tasmania. It is a beaver like monotreme about
5060 cm long and well adapted to live in water.
Usually, two eggs are laid at a time. The female curls
around them for incubation and remains inactive for
about two weeks. Newly hatched young ones are very
immature, naked, blind and each is 2.5 cm long.
#13. Which of the following characteristics is mainly responsible for diversification of insects on land?
(a) : Exoskeleton made of cuticle has enabled
insects to live on land and to diversify to almost all
the possible habitats. It gives them protection, support
and also helps to prevent desiccation.
#14. Select the taxon mentioned that represents both marine and fresh water species.
(d) : Cnidarians are the saclike animals which
are aquatic, mostly marine except a few like Hydra,
are fresh water. They are the simplest organisms that
have attained a tissue level of organization. Members
of Ctenophora, Cephalochordata and Echinodermata
are exclusively marine.
#15. Which one of the following living organisms completely lacks a cell wall?
(b) : Gorgonia (sea fan) is an animal belonging
to phylum Coelenterata. All animals lack cell wall.
#16. Planaria possesses high capacity of
(b) : Planaria possesses high degree of
regeneration. Both epimorphosis, in which the
missing parts are formed and morphallaxis, in which
the whole body can be regenerated from a fragment
of the body, occurs.
#17. A marine cartilaginous fish that can produce electric current is
(b): Torpedo is a bottomliving marine fish,
discharging electricity which is sufficient to stun preys
such as small fishes, etc. A pair of electric organs are
situated on the dorsal side of the trunk region. Infact
the electric organs are the modified lateral muscle
plates innervated by the cranial nerves.
#18. Which of the following are correctly matched with respect to their taxonomic classification?
(a) : Spiny anteater (Echidna) is a prototherian
mammal whereas, sea urchins and sea cucumber are
echinoderms. Silver fish (Lepisma) is an insect, Cuttle
fish (Sepia) is a mollusc and flying fish (Exocoetus)
is a bony fish. Centipede is class chilopoda, Millipede
is class diplopoda and Scorpion and Spider are class
arachnida of Phylum Arthropoda
#19. Which group of animals belong to the same phylum?
(a) : Prawn, Scorpion and Locusta belong to the
phylum Arthropoda. All other animals categories are
Sponge Æ Porifera
Sea anemone Æ Coelenterata
Starfish Æ Echinodermata
Malarial parasite, Amoeba Æ Protozoa
Mosquito Æ Arthropoda
Earthworm Æ Annelida
Pinworm Æ Aschelminthes
Tapeworm Æ Platyhelminthes
#20. One of the representatives of Phylum Arthro poda is
(d) : Phylum Arthropoda is the largest phylum
of Animalia which includes insects. Examples include
Apis, silkworm, Laccifer, silver fish (Lepisma), locust,
etc. Puffer fish and flying fish (Exocoetus) are
examples of superclass Pisces, while cuttle fish
(Sepia) belongs to Mollusca.
#21. The characteristics of Class Reptilia are
(d) : Reptiles represent the first class of
vertebrates fully adapted for life in dry places on land.
The characters of reptiles are in fact a combination
of characters that are found in fish and amphibians
on one hand and birds and mammals on the other.
Their exoskeleton is of horny epidermal scales,
shields, plates and scutes. The skin is dry, cornified
and devoid of glands. Reptiles lack external ears and
have immovable eyelids.
#22. Which one of the following groups of animals reproduces only by sexual means?
(d) : In ctenophores, asexual reproduction is
absent. They are monoecious and fertilization is
generally external. In cnidaria, asexual reproduction
(budding) is found in the polyps and sexual
reproduction is found in the medusa form. Both
asexual and sexual reproduction occur in porifera
(sponges). Asexual reproduction occurs by budding
and gemmules. In protozoa, asexual reproduction
takes place by binary fission, budding etc. and sexual
reproduction takes place by syngamy and conjugation.
#23. Sharks and dogfishes differ from skates and rays because
(d) : Sharks and dogfishes have cylindrical body
while skates and rays have both of their pectoral fins
fused. It gives a winglike appearance and are not
distinct from body.
#24. Which one of the following is one of the paths followed by air or O 2 during respiration in the adult male Periplaneta americana as it enters the animal body?
(a) : The respiratory system is well developed in
a cockroach in order to compensate the poorly
developed circulatory system. It consists of tracheae,
tracheoles and spiracles. The main tracheal trunks
open to the exterior on body surface through 10 pairs
of segmentally arranged apertures termed spiracles
or stigmata. Two pairs of spiracles are thoracic, one
between pro and mesothorax and the other between
meso and metathorax. Haemocoel contains a network
of elastic, closed and branching air tubes or tracheae.
The ultimate finer branches of tracheae are called
tracheoles which come in contact with the individual
body cells. The elaborate tracheal system carries
oxygen directly to all the body cells.
#25. Pheretima and its close relatives derive nourishment from
(b) : Pheretima (earthworm) and related
organisms feed upon the decaying organic matter
found in the soil. They also feed on the bits of plants
and animal matter. Thus, they are omnivorous
#26. In which one of the following, the genus name, its two characters and its phylum are not correctly matched, whereas the remaining three are correct?
(a) : Pila belongs to phylum mollusca. The body
of molluscs (soft bodied animals) is unsegmented,
with a distinct head, muscular foot and visceral hump.
Radula is found in mouth of Pila.
#27. Which one of the following pairs of animals are similar to each other pertaining to the feature stated against them?
(d) : Sea horse (Hippocampus) and flying fish
(Exocoetus) belong to class osteichthyes of super class
pisces. They have two chambered heart (one auricle
and one ventricle) and are cold blooded animals.
#28. Which one of the following categories of animals, is correctly described with no single exception in it?
(b) : Heart is generally 3chambered in reptiles
but in crocodile, it is 4chambered. Sponges are
generally marine and have collared cells but few fresh
water forms can also be seen like Spongilla. All
mammals are viviparous (giving birth to young ones)
with an exception, Ornithorhynchus(platypus), which
is oviparous (egg laying).
#29. What will you look for to identify the sex of the following?
(d) : Tail end is straight in female Ascaris, while
tail end is curved ventral words in male Ascaris. Anal
cerci is present in both male and female cockroach,
while anal style is present only in the male cockroach.
The forelimbs in both frogs (male and female) bear
small articular pads dorsally at the joints of digit, but
the males possess a special nuptial, copulatory pad
on ventral side of the first finger of each forelimb.
Copulatory pad appears merely as rough patches, but
during breeding season, these become thick and
sticky. In copulation, the male strongly grips a female
under her armpits by means of these pads. Claspers
are modified inner edges of pelvic fins in male sharks
#30. Which one of the following statements is totally wrong about the occurrence of notochord, while the other three are correct?
(c) : Humans are mammals which are chordates.
Phylum chordata includes animals which possess a
notochord either throughout or during early
embryonic life. In Ascidia (urochordata), notochord
is present only in larval tail while in Amphioxus
(cephalochordata), it extends from head to tail region
and is persistent throughout their life. It is replaced
by a vertebral column in adult frog.
#31. Ureters act as urinogenital ducts in
(d) : In male frogs, two ureters act as urinogenital
duct which open into the cloaca. They run backwards
from the kidneys and open into the cloaca. In female
ureters carry urine alone, while in male both sperms
and urine are carried. Hence, are called urinogenital
#32. One example of animals having a single opening to the outside that serves both as mouth as well as anus is
(d) : In Fasciola (flatworms) the body has a
single cavity with one opening to the outside. The
single opening functions as both mouth for ingestion
(intake of food) and anus for egestion (undigested
food is passed out). It is called blind sac plan. Other
examples are coelenterates.
#33. Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?
(c) : Spongilla is a common, widely distributed
fresh water sponge belonging to phylum porifera.
Canal system in Spongilla is essentially of rhagon
type with choanocytes restricted to small rounded
chambers. It is not found in leech, dolphin and
#34. Which one of the following kinds of animals are triploblastic?
(a) : Triploblastic is a condition which describes
an animal having a body composed of three embryonic
germ layers : the ectoderm, mesoderm and endoderm.
Most multicellular animals belonging to phylum
platyhelminthes to phylum chordata are triploblastic.
Ctenophores, sponges and corals are diploblastic.
#35. Which one of the following statements about certain given animals is correct?
(a) : Acoelomates are animals having no body
cavity or coelom. Examples are poriferans
coelenterates, ctenophora, platyhelminthes and
nemertinea. In pseudocoelomates, body space is
pseudocoelom or false coelom. Examples are
ectoprocta, aschelminthes. In coelomates, body space
is a true coelom enclosed by mesoderm on both sides.
Remaining phyla of bilateria, from annelida to
arthropoda are coelomates. Molluses and insects are
coelomates while flatworms are acoelomates.
#36. In which one of the following organisms its excretory organs are correctly stated?
(b) : Nephridia is the excretory organ of the
earthworm. Earthworms have three types of nephridial
structures called as septal, integumentary and
pharyngeal nephridia. These three nephridial
structures are present on different positions in the
body and also vary in structures. Septal and
pharyngeal nephridia are both enteronephric i.e., nitrogen products are expelled in gut. Integumentary
nephridia is exonephric i.e., nitrogen waste products
are directly discharged outside
#37. Crocodile and penguin are similar to whale and dogfish in which one of the following features?
(d) :Animals belonging to Phylum Chordata are
fundamentally characterised by the presence of a
notochord, a dorsal hollow nerve cord and paired
pharyngeal gill slits. Crocodile, penguin, whale and
dogfish are all chordates. All of them have gill slits
or have had it during embryonic development. Thus,
paired gill slits are present in these animal at some
stage of life
#38. Which one of the following groups of animals is bilaterally symmetrical and triploblastic?
(a) : Aschelminthes is a superphylum consisting
of pseudocoelomates. These are mostly aquatic, free
living or parasitic. Their body is slender, bilaterally
symmetrical and triploblastic.
#39. Which one of the following in birds, indicates their reptilian ancestry?
. (c) : Birds have originated from some ancestral
reptilian stalk. These two classes have so many
features in common that link the two groups. The
evidence of reptilian ancestry of birds is furnished
by their comparative anatomy, embryology and
palaeontology. One of the features is that all birds
have horny epidermal scales confined to the lower
parts of their legs and feet, which are exactly like the
epidermal scales of the reptiles
#40. Ascaris is characterized by
(d) : Ascaris belong to the Phylum Nematoda of
Superphylum Aschelminthes. They have a cylindrical
body without showing any metamerism, a pseudocoel
(false coelom) and a complete digestive tract lined
by endodermal epithelium. The cuticle covering the
body surface bears minute transverse striations giving
a pseudosegmented appearance to the worm.
#41. Which one of the following pairs of items correctly belongs to the category of organs mentioned against it?
(a) : Nephridia are excretory organs of
earthworm which consist of a simple or branched
tube formed by the ingrowth of ectoderm with cilia
at the inner end. Excretory products diffuse into the
nephridium and are wafted to the exterior by ciliary
action. Malpighian tubules are the organs that are
involved in the excretion of nitrogenous wastes in
cockroach. It open into the intestine; selectively
extract from the blood uric acid, whichtogether with
water and salts – is deposited into the hindgut and
excreted in the faeces.
#42. Which one of the following phyla is correctly matched with its two general characteristics?
(c) : Arthropods are the largest phylum of
Kingdom Animalia that characteristically possesses
an outer body layer – the cuticle. The body is
composed of segments usually forming distinct
specialized body regions, i.e., head, thorax and
abdomen. In them the trachea or windpipe or book
lungs are the respiratory organs found in terrestrial
forms, which help in respiration.
#43. Which one of the following is not a characteristic of Phylum Annelida?
(a) : Phylum Annelida comprises invertebrates,
which are segmented worms having cylindrical soft
bodies showing metameric segmentation. These are
triploblastic animals showing bilateral symmetry. A
true coelom is present which is filled with coelomic
fluid containing cells. Annelids are perhaps the first
animals to have a true schizocoelic coelom.
#44. What is common between parrot, platypus and kangaroo?
(d) : Homoiothermy is the maintenance by an
animal of its internal body temperature at a relatively
constant value by using metabolic processes to
counteract fluctuations in the temperature of the
environment. Homoiothermy occurs in birds and
mammals, which are described as endotherms. The
heat produced by their tissue metabolism and the heat
lost to the environment are balanced by various means
to keep body temperature constant: 3638ºC in
mammals and 3840ºC in birds. The hypothalamus
#45. What is true about Nereis, scorpion, cockroach and silver fish?
(a) : Nereis, scorpion, cockroach and silver fish
are all invertebrates and thus possess dorsal heart.
Nereis is a marine animal while other animals
mentioned in the question are terrestrial. Nereis
belongs to Phylum Annelida while rest of the animals
belong to Phylum Arthropoda. Jointed appendages
are present in scorpion, cockroach and silver fish.
#46. Biradial symmetry and lack of cnidoblasts are the characteristics of
(c) : Ctenophora is a small phylum of exclusively
marine, invertebrate animals. Ctenoplana and Beroe
are examples of ctenophora. They have biradial
symmetry (a combination of radial and bilateral
They lack the specialized stinging cells (nematocysts)
found in coelenterates, but one species (Haeckelia
rubra) incorporates those of its jellyfish prey for its
#47. Two common characters found in centipede, cockroach, and crab are
(c) : Centipede, cockroach, and crab all belong
to phylum arthropoda which are characterized by
jointed legs and chitinous exoskeleton. Arthropods
have bilaterally symmetrical and metamerically
segmented body with haemocoel and open blood
#48. In which one of the following sets of animals do all the four give birth to young ones?
(a) : Kangaroo, hedgehog, dolphin and Loris are
mammals and thus give brith to young ones. Ostrich
and kiwi are brids that lay eggs. Platypus is a most
primitive living mammal that lays eggs. Other animals
in the options are mammals and give birth to young
#49. Which one of the following is not a living fossil?
(d) : Living fossil is a term for any living species
(or clade) of organism which closely resembles
species otherwise only known from fossils and has
no close living relatives. These species have all
survived major extinction events, and generally retain
low taxonomic diversities.
Some examples of living fossils in animals are –
coelocanth, coral (polyp), crocodylia (crocodiles,
gavials and alligators), horseshoe crab (Limulus
polyphemus), monotremes (Platypus and Echidna),
snoutnosed frog (Nasikabatrachus sahyadrensis).
Archaeopteryx is the earliest and most primitive
known bird to date. It lived in the Jurassic Period
around 150155 million years ago. It has feathers and
wings but it also had teeth and a skeleton similar to a
small carnivorous dinosaur, therefore, it had both bird
and theropod dinosour features. Archaeopteryx is a
powerful piece of evidence that shows that birds have
evolved from dinosaurs.
#50. Annual migration does not occur in the case of
(d) : Migration is the seasonal movement of
complete populations of animals to a more favourable
environment. It is common in mammals (e.g. porpoises), fish (e.g. eels and salmon) and some
insects but is most marked in birds. The arctic tern,
for example, migrates annually from its breeding
ground in the Arctic circle to the Antarctic. Salmon
usually migrate from marine to fresh water to spawn.
The siberian crane, breeds in arctic Russia in Ykutia
and western Siberia. It is a long distant migrant.
Salamander is an amphibian with slender body, short
legs and long tail. Outside the breeding season they
are seldom seen as they spend most of their time