Zoology Animals Classification Competitive Exams
100 questions · General Science
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Question 1 of 100
Starfish belongs to the phylum
ExplanationEchinoderms are spiny-skinned marine animals.
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Question 2 of 100
The excretory organs of insects are
ExplanationThey remove nitrogenous waste as uric acid.
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Question 3 of 100
Metamerism (true segmentation) is characteristic of
ExplanationArthropods and chordates also show it.
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Question 4 of 100
Hirudin, an anticoagulant, is secreted by
ExplanationLeeches belong to Annelida.
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Question 5 of 100
The lateral line of fishes is a
ExplanationIt detects vibrations and pressure changes.
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Question 6 of 100
The respiratory pigment haemocyanin contains
ExplanationIt is found in many molluscs and crustaceans.
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Question 7 of 100
The largest animal on Earth is the
ExplanationThe blue whale is the largest known animal, a marine mammal.
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Question 8 of 100
The only mammal capable of true flight is the
ExplanationBats belong to order Chiroptera. Flying squirrels only glide.
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Question 9 of 100
Torsion is a developmental process characteristic of
ExplanationThe visceral mass rotates by 180 degrees.
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Question 10 of 100
Amphioxus (Branchiostoma) belongs to
ExplanationIts notochord extends the entire length of the body.
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Question 11 of 100
Birds belong to the class
ExplanationBirds have feathers, beaks and lay hard-shelled eggs.
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Question 12 of 100
Forelimb of a human and wing of a bat are
ExplanationThey share the same basic structure but differ in function.
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Question 13 of 100
The water vascular system is a characteristic of
ExplanationIt operates the tube feet used for locomotion.
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Question 14 of 100
Sponges belong to the phylum
ExplanationPorifera means pore-bearing; sponges are sessile and filter feeders.
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Question 15 of 100
The correct order of taxonomic hierarchy from highest to lowest is
ExplanationMnemonic: King Philip Came Over For Good Soup.
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Question 16 of 100
Placoid scales are found in
ExplanationThey are tooth-like in structure.
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Question 17 of 100
Mammals nourish their young with
ExplanationMammary glands are a defining feature of mammals.
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Question 18 of 100
Which mammal lays eggs?
ExplanationPlatypus and echidna are monotremes.
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Question 19 of 100
Deuterostomes include
ExplanationThe blastopore becomes the anus.
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Question 20 of 100
Which muscular partition separates thorax from abdomen in mammals?
ExplanationThe diaphragm aids breathing.
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Question 21 of 100
The rasping feeding organ of many molluscs is the
ExplanationBivalves lack a radula.
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Question 22 of 100
The malarial parasite Plasmodium is transmitted by
ExplanationAedes transmits dengue.
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Question 23 of 100
Adult amphibians generally have a heart with
ExplanationTwo atria and one ventricle.
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Question 24 of 100
Snail and octopus belong to the phylum
ExplanationMolluscs are soft-bodied animals, often with a shell.
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Question 25 of 100
Which of the following is a warm-blooded animal?
ExplanationBirds and mammals are endothermic (homeothermic).
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Question 26 of 100
In binomial nomenclature, a scientific name consists of
ExplanationExample: Homo sapiens.
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Question 27 of 100
Hydra belongs to the phylum
ExplanationCnidarians have stinging cells and a sac-like gut.
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Question 28 of 100
Which feature is common to all animals?
ExplanationThese traits separate Kingdom Animalia from plants and fungi.
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Question 29 of 100
Frog belongs to the class
ExplanationAmphibians live both in water and on land.
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Question 30 of 100
The swim bladder helps bony fishes to
ExplanationIt is a gas-filled sac.
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Question 31 of 100
Which set contains chordate features?
ExplanationThese are present at some stage of life in all chordates.
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Question 32 of 100
A tadpole develops into a frog through
ExplanationAmphibian metamorphosis is controlled by thyroid hormone.
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Question 33 of 100
Pearls are produced by
ExplanationNacre is deposited around an irritant by the mantle.
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Question 34 of 100
Spiders belong to the class
ExplanationArachnids have eight legs and two body regions.
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Question 35 of 100
Autotomy (shedding of the tail) is seen in
ExplanationThe tail regenerates later.
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Question 36 of 100
Silk is produced from the cocoon of
ExplanationThe silkworm is the larva of a moth.
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Question 37 of 100
The most intelligent invertebrate is generally considered to be the
ExplanationCephalopods have a large brain and advanced eyes.
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Question 38 of 100
Hydra shows which type of symmetry?
ExplanationCnidarians are radially symmetrical.
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Question 39 of 100
The Indus River dolphin (Bhulan) is a
ExplanationIt lives in the Indus and navigates by echolocation.
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Question 40 of 100
The biological species concept was proposed by
ExplanationA species is a group of interbreeding populations reproductively isolated from others.
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Question 41 of 100
Among reptiles, which has a four-chambered heart?
ExplanationCrocodilians have a complete ventricular septum.
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Question 42 of 100
Earthworm is
ExplanationIt has both male and female reproductive organs but cross-fertilises.
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Question 43 of 100
Ascaris (roundworm) belongs to the phylum Nematoda, which is
ExplanationThe body cavity is not completely lined by mesoderm.
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Question 44 of 100
Lampreys and hagfishes are
ExplanationThey have round mouths without jaws.
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Question 45 of 100
Whales belong to the class
ExplanationThey breathe air and nurse their young.
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Question 46 of 100
The gill cover (operculum) is a feature of
ExplanationIt helps in ventilation.
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Question 47 of 100
Who is known as the Father of Taxonomy?
ExplanationLinnaeus founded modern classification and binomial nomenclature.
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Question 48 of 100
The excretory organs of earthworm are
ExplanationNephridia are segmentally arranged.
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Question 49 of 100
Amoeba belongs to the group
ExplanationAmoeba is a single-celled organism that moves by pseudopodia.
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Question 50 of 100
The exoskeleton of insects is made of
ExplanationChitin is a nitrogen-containing polysaccharide.
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Question 51 of 100
A feature exclusive to mammals is
ExplanationAll mammals have hair at some stage.
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Question 52 of 100
Rats and squirrels belong to the order
ExplanationRodents have continuously growing incisors.
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Question 53 of 100
Schizocoelous coelom formation is typical of
ExplanationThe coelom arises by splitting of mesoderm; in deuterostomes, it is enterocoelous.
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Question 54 of 100
Sharks are
ExplanationSharks belong to the class Chondrichthyes.
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Question 55 of 100
Animals that feed only on plants are called
ExplanationExamples: cow, goat, deer.
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Question 56 of 100
Poikilothermic animals are
ExplanationFishes, amphibians and reptiles are poikilotherms.
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Question 57 of 100
Male honeybees (drones) develop by
ExplanationDrones are haploid.
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Question 58 of 100
The tallest living animal is the
ExplanationA giraffe can be about 5 m tall.
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Question 59 of 100
Flame cells serve as excretory structures in
ExplanationThey are protonephridia.
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Question 60 of 100
The green turtle that nests on Karachi's beaches is a
ExplanationSea turtles lay eggs on sandy beaches.
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Question 61 of 100
Birds have light, air-filled bones called
ExplanationThis reduces weight for flight.
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Question 62 of 100
Mammals show dentition that is
ExplanationTeeth differ in type, are replaced once, and are set in sockets.
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Question 63 of 100
Butterflies show
ExplanationHolometabolous insects pass through a pupal stage.
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Question 64 of 100
The heart of a fish has how many chambers?
ExplanationOne atrium and one ventricle; blood flows in a single circuit.
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Question 65 of 100
Who is regarded as the Father of Zoology?
ExplanationAristotle classified animals in Historia Animalium. Theophrastus is the Father of Botany.
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Question 66 of 100
In tunicates (Urochordata) the notochord is present in
ExplanationThe adult shows retrogressive metamorphosis.
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Question 67 of 100
Diploblastic animals include
ExplanationThey have only ectoderm and endoderm layers.
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Question 68 of 100
Hydra reproduces asexually by
ExplanationA bud develops and detaches.
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Question 69 of 100
Venom of vipers is mainly
ExplanationCobra and krait venom is mainly neurotoxic.
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Question 70 of 100
Hooks and suckers on the scolex of Taenia help in
ExplanationTapeworms have no digestive system and absorb nutrients directly.
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Question 71 of 100
In cockroach, the young stage that resembles the adult is called
ExplanationCockroaches show incomplete metamorphosis.
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Question 72 of 100
The largest phylum of the animal kingdom is
ExplanationArthropoda includes insects, spiders and crustaceans.
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Question 73 of 100
Caecilians belong to the amphibian order
ExplanationThey are burrowing and limbless.
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Question 74 of 100
Tapeworm belongs to the phylum
ExplanationTaenia is a flat, ribbon-like endoparasite.
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Question 75 of 100
The heart of birds has
ExplanationComplete separation of oxygenated and deoxygenated blood.
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Question 76 of 100
Planaria is famous for its power of
ExplanationPlanaria can regrow an entire body from a fragment.
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Question 77 of 100
According to the International Code of Zoological Nomenclature, a scientific name is written
ExplanationExample: Panthera leo.
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Question 78 of 100
Fish breathe through
ExplanationGills extract dissolved oxygen from water.
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Question 79 of 100
Flatworms (Platyhelminthes) are
ExplanationThey lack a body cavity between body wall and gut.
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Question 80 of 100
The body of an insect is divided into
ExplanationSpiders have a cephalothorax and abdomen.
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Question 81 of 100
The circulatory system of arthropods is
ExplanationBlood flows in haemocoel spaces.
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Question 82 of 100
Stinging cells (cnidocytes) are characteristic of
ExplanationCnidocytes contain nematocysts used for defence and prey capture.
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Question 83 of 100
Animals without a backbone are called
ExplanationAbout 95% of animal species are invertebrates.
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Question 84 of 100
The true stomach of a ruminant is the
ExplanationRumen, reticulum and omasum are modified oesophageal chambers.
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Question 85 of 100
Insects breathe through
ExplanationTracheal tubes carry air directly to tissues.
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Question 86 of 100
Prototherian mammals include
ExplanationThey are egg-laying mammals found in Australia and New Guinea.
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Question 87 of 100
Marsupials such as the kangaroo belong to
ExplanationThe young are born immature and develop in a pouch.
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Question 88 of 100
How many legs does an insect have?
ExplanationInsects have three pairs of legs on the thorax.
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Question 89 of 100
Bilateral symmetry is associated with
ExplanationA head with sense organs develops at the anterior end.
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Question 90 of 100
Collar cells (choanocytes) are found in
ExplanationTheir flagella create water currents through the sponge body.
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Question 91 of 100
The largest living bird is the
ExplanationThe ostrich is flightless and can grow up to about 2.7 m tall.
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Question 92 of 100
Archaeopteryx is considered a connecting link between
ExplanationIt had feathers, teeth and a long bony tail.
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Question 93 of 100
Which group first evolved the amniotic egg?
ExplanationThe amnion allows development on land.
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Question 94 of 100
Crabs and prawns belong to the class
ExplanationCrustaceans have two pairs of antennae.
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Question 95 of 100
Earthworm belongs to the phylum
ExplanationAnnelids have segmented bodies.
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Question 96 of 100
Obelia exhibits polymorphism, meaning
ExplanationCnidarians show metagenesis.
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Question 97 of 100
The scientific study of animals is called
ExplanationZoology (Greek zoon = animal) is the branch of biology dealing with animals.
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Question 98 of 100
Snakes belong to the class
ExplanationReptiles have dry scaly skin.
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Question 99 of 100
Wings of a butterfly and a bird are
ExplanationDifferent origin but similar function.
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Question 100 of 100
A tadpole breathes by
ExplanationAdult frogs use lungs and moist skin.
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