🐾 Animal Kingdom – MCQs

Part 1 (Q1–Q25)

Q1. The Animal Kingdom is classified mainly based on:

A) Reproduction
B) Symmetry, coelom, and segmentation ✅
C) Feeding habits
D) Circulatory system

Explanation: Symmetry, body cavity (coelom), and segmentation are the major basis for classification of animals.

Q2. Which is the simplest animal phylum?

A) Cnidaria
B) Porifera ✅
C) Platyhelminthes
D) Annelida

Explanation: Porifera (sponges) are the simplest animals, lacking true tissues and organs.

Q3. Which group is diploblastic?

A) Porifera
B) Cnidaria ✅
C) Annelida
D) Arthropoda

Explanation: Cnidarians have two germ layers (ectoderm + endoderm).

Q4. Which is the first triploblastic phylum?

A) Cnidaria
B) Platyhelminthes ✅
C) Nematoda
D) Annelida

Explanation: Platyhelminthes (flatworms) are the first animals with three germ layers.

Q5. Animals with radial symmetry are found in:

A) Arthropoda
B) Mollusca
C) Echinodermata ✅
D) Annelida

Explanation: Adult echinoderms show radial symmetry, though larvae are bilaterally symmetrical.

Q6. The body cavity lined by mesoderm is called:

A) Acoelom
B) Coelom ✅
C) Pseudocoelom
D) Hemocoel

Explanation: Coelom is a true body cavity lined by mesoderm.

Q7. Which animals show pseudocoelom?

A) Platyhelminthes
B) Annelids
C) Nematodes ✅
D) Molluscs

Explanation: Roundworms (Nematoda) have pseudocoelom, not fully lined by mesoderm.

Q8. Metameric segmentation is seen in:

A) Annelida ✅
B) Mollusca
C) Arthropoda ✅
D) Both A & C

Correct Answer: D) Both A & C

Explanation: Annelids and arthropods show true metamerism (segmented body).

Q9. Which phylum includes sponges?

A) Porifera ✅
B) Cnidaria
C) Echinodermata
D) Annelida

Explanation: Porifera are sponges, with pores and canal system.

Q10. The stinging cells of cnidarians are called:

A) Nematocysts ✅
B) Flame cells
C) Nephridia
D) Cnidoblasts ✅

Correct Answer: D) Cnidoblasts (with nematocysts)

Explanation: Cnidoblasts (with nematocysts) are stinging cells used for defense and prey capture.

Q11. Flatworms belong to:

A) Cnidaria
B) Platyhelminthes ✅
C) Nematoda
D) Echinodermata

Explanation: Platyhelminthes are flatworms like Planaria, Taenia.

Q12. The first true coelomates are:

A) Platyhelminthes
B) Annelids ✅
C) Nematodes
D) Arthropods

Explanation: Annelida are the first phylum to have true coelom (schizocoelous).

Q13. The excretory organ of flatworms is:

A) Nephridia
B) Flame cells ✅
C) Malpighian tubules
D) Kidneys

Explanation: Platyhelminthes excrete through flame cells (protonephridia).

Q14. Which phylum includes roundworms?

A) Platyhelminthes
B) Nematoda ✅
C) Annelida
D) Arthropoda

Explanation: Nematoda includes roundworms like Ascaris.

Q15. Segmented worms belong to:

A) Nematoda
B) Platyhelminthes
C) Annelida ✅
D) Echinodermata

Explanation: Annelida (earthworm, leech) are segmented worms.

Q16. Which animals have a hemocoel?

A) Arthropods ✅
B) Molluscs ✅
C) Echinoderms
D) Both A & B

Correct Answer: D) Both A & B

Explanation: Arthropods and molluscs have an open circulatory system with hemocoel.

Q17. The radula is found in:

A) Arthropoda
B) Mollusca ✅
C) Annelida
D) Echinodermata

Explanation: Radula is a rasping organ in molluscs used for feeding.

Q18. The water vascular system is characteristic of:

A) Molluscs
B) Echinoderms ✅
C) Annelids
D) Cnidarians

Explanation: Echinoderms (starfish, sea urchin) have a water vascular system for locomotion and respiration.

Q19. Which phylum has jointed appendages?

A) Annelida
B) Arthropoda ✅
C) Mollusca
D) Echinodermata

Explanation: Arthropoda (insects, crustaceans) have jointed appendages.

Q20. The largest phylum in the animal kingdom is:

A) Mollusca
B) Arthropoda ✅
C) Annelida
D) Echinodermata

Explanation: Arthropoda is the largest phylum, with insects making up the majority.

Q21. Which animals are exclusively marine?

A) Molluscs
B) Echinoderms ✅
C) Annelids
D) Arthropods

Explanation: Echinoderms are exclusively marine animals.

Q22. The exoskeleton of arthropods is made of:

A) Chitin ✅
B) Cellulose
C) Protein
D) Collagen

Explanation: Arthropod exoskeleton is made of chitin.

Q23. The respiratory organs in crustaceans are:

A) Tracheae
B) Book lungs
C) Gills ✅
D) Skin

Explanation: Crustaceans (prawn, crab) respire through gills.

Q24. The notochord is present in:

A) Non-chordates
B) Chordates ✅
C) Echinoderms
D) Arthropods

Explanation: Chordates are defined by the presence of notochord, dorsal hollow nerve cord, and pharyngeal gill slits.

Q25. Which of the following is a vertebrate?

A) Amphioxus
B) Frog ✅
C) Ascaris
D) Earthworm

Explanation: Frog is a vertebrate belonging to class Amphibia under Chordata.

🐾 Diversity of the Living World – Animal Kingdom

Part 2 (Q26–Q50)

Q26. The blood of cockroach is:

A) Red
B) Blue
C) Green
D) Colourless ✅

Explanation: Cockroach blood lacks hemoglobin, so it is colourless and not used for oxygen transport.

Q27. In annelids, the excretory organs are:

A) Flame cells
B) Nephridia ✅
C) Malpighian tubules
D) Green glands

Explanation: Annelids (earthworm, leech) excrete through nephridia.

Q28. The excretory organ of crustaceans is:

A) Nephridia
B) Malpighian tubules
C) Green glands ✅
D) Flame cells

Explanation: Crustaceans (prawn, crab) excrete via green glands (antennal glands).

Q29. Bilateral symmetry first appeared in:

A) Cnidaria
B) Platyhelminthes ✅
C) Echinodermata
D) Annelida

Explanation: Flatworms (Platyhelminthes) are the first bilaterally symmetrical animals.

Q30. The circulatory system of annelids is:

A) Absent
B) Open
C) Closed ✅
D) Water vascular

Explanation: Annelids (earthworm) have a closed circulatory system, unlike arthropods and molluscs.

Q31. The body cavity of arthropods is:

A) True coelom
B) Pseudocoelom
C) Hemocoel ✅
D) Acoelom

Explanation: Arthropods have an open circulatory system with hemocoel.

Q32. Which phylum is also called “flatworms”?

A) Cnidaria
B) Platyhelminthes ✅
C) Annelida
D) Nematoda

Explanation: Platyhelminthes include flatworms like Planaria and Tapeworm.

Q33. The body of molluscs is divided into:

A) Head, thorax, abdomen
B) Head-foot, visceral mass, mantle ✅
C) Head and tail
D) Cephalothorax and abdomen

Explanation: Molluscs have head-foot (movement), visceral mass (organs), and mantle (shell secretion).

Q34. Which of the following is not a coelomate?

A) Annelida
B) Mollusca
C) Nematoda ✅
D) Arthropoda

Explanation: Nematoda (roundworms) are pseudocoelomates.

Q35. Hermaphroditism is common in:

A) Earthworm ✅
B) Cockroach
C) Prawn
D) Fish

Explanation: Earthworm is hermaphroditic (bisexual), having both male and female sex organs.

Q36. Which animal is triploblastic and acoelomate?

A) Hydra
B) Planaria ✅
C) Ascaris
D) Earthworm

Explanation: Flatworms (Platyhelminthes, e.g., Planaria) are triploblastic acoelomates.

Q37. The body of sponges is supported by:

A) Spicules ✅
B) Nematocysts
C) Radula
D) Ossicles

Explanation: Sponges (Porifera) have spicules or spongin fibers for body support.

Q38. The excretory organ of earthworm is:

A) Flame cell
B) Nephridia ✅
C) Green gland
D) Malpighian tubules

Explanation: Earthworm excretes through nephridia.

Q39. Insects breathe through:

A) Gills
B) Skin
C) Tracheae ✅
D) Lungs

Explanation: Insects have a tracheal system for respiration.

Q40. In Echinoderms, the skeleton is made of:

A) Chitin
B) Calcium carbonate ✅
C) Silica
D) Keratin

Explanation: Echinoderms (starfish, sea urchin) have an endoskeleton of calcareous ossicles.

Q41. Which phylum shows water vascular system?

A) Annelida
B) Echinodermata ✅
C) Arthropoda
D) Mollusca

Explanation: Echinodermata have a unique water vascular system for locomotion and feeding.

Q42. Which animals have book lungs?

A) Cockroach
B) Prawns
C) Spiders ✅
D) Earthworms

Explanation: Spiders (arachnids) respire using book lungs.

Q43. The digestive system of tapeworm is:

A) Complete
B) Absent ✅
C) Incomplete
D) Tubular

Explanation: Tapeworm (Platyhelminthes) absorbs food directly from host, so no digestive system.

Q44. The excretory organs of insects are:

A) Nephridia
B) Malpighian tubules ✅
C) Green glands
D) Flame cells

Explanation: Insects (cockroach, grasshopper) excrete via Malpighian tubules.

Q45. Which animals are called roundworms?

A) Platyhelminthes
B) Nematoda ✅
C) Annelida
D) Cnidaria

Explanation: Nematoda are roundworms like Ascaris.

Q46. In coelenterates, the body is:

A) Acoelomate ✅
B) Pseudocoelomate
C) Coelomate
D) Hemocoel

Explanation: Cnidarians (Hydra, jellyfish) are diploblastic acoelomates.

Q47. Which is the largest class of Arthropoda?

A) Crustacea
B) Arachnida
C) Insecta ✅
D) Myriapoda

Explanation: Insecta (bees, ants, butterflies) is the largest class of Arthropods.

Q48. Which animals are bilaterally symmetrical?

A) Hydra
B) Earthworm ✅
C) Starfish
D) Sponge

Explanation: Earthworm (Annelid) is bilaterally symmetrical.

Q49. Which group is exclusively marine?

A) Echinodermata ✅
B) Mollusca
C) Annelida
D) Arthropoda

Explanation: Echinoderms (starfish, sea cucumbers) are exclusively marine.

Q50. Which feature is common to annelids and arthropods?

A) Jointed appendages
B) Chitinous exoskeleton
C) Segmentation ✅
D) Radial symmetry

Explanation: Both annelids and arthropods show segmentation (metamerism).

🐾 Diversity of the Living World – Animal Kingdom

Part 3 (Q51–Q75)

Q51. The body of sponges shows:

A) Tissue grade of organization
B) Cellular grade of organization ✅
C) Organ grade of organization
D) Organ-system grade

Explanation: Sponges (Porifera) show cellular level of organization, not tissues or organs.

Q52. Which of the following shows tissue grade of organization?

A) Sponges
B) Cnidarians ✅
C) Roundworms
D) Earthworms

Explanation: Cnidaria have tissue grade of organization with two layers (diploblastic).

Q53. Which animals show organ-system level of organization?

A) Hydra
B) Planaria
C) Earthworm ✅
D) Sponge

Explanation: Earthworm (annelid) shows organ-system organization with circulatory, nervous, and digestive systems.

Q54. Which of the following is a coelomate animal?

A) Earthworm ✅
B) Ascaris
C) Planaria
D) Hydra

Explanation: Earthworm (annelid) has a true coelom, while others do not.

Q55. Animals having body cavity not lined by mesoderm are called:

A) Coelomates
B) Acoelomates
C) Pseudocoelomates ✅
D) Hemocoelates

Explanation: In pseudocoelomates (roundworms), the cavity is not completely lined by mesoderm.

Q56. Which phylum has canal system?

A) Porifera ✅
B) Annelida
C) Mollusca
D) Arthropoda

Explanation: Porifera (sponges) have a canal system for water flow, nutrition, and respiration.

Q57. Which of the following shows alternation of generations?

A) Earthworm
B) Jellyfish (Obelia) ✅
C) Cockroach
D) Ascaris

Explanation: Cnidarian Obelia alternates between polyp (asexual) and medusa (sexual) stages.

Q58. Which phylum includes tapeworm?

A) Platyhelminthes ✅
B) Nematoda
C) Annelida
D) Mollusca

Explanation: Taenia solium (tapeworm) belongs to Platyhelminthes.

Q59. Which is a free-living flatworm?

A) Planaria ✅
B) Taenia
C) Fasciola
D) Both B & C

Explanation: Planaria is a non-parasitic, free-living flatworm.

Q60. Excretion in planaria occurs through:

A) Nephridia
B) Malpighian tubules
C) Flame cells ✅
D) Green glands

Explanation: Platyhelminthes like Planaria excrete via flame cells (protonephridia).

Q61. The phylum which shows “tube within a tube” body plan is:

A) Cnidaria
B) Platyhelminthes
C) Nematoda ✅
D) Porifera

Explanation: Roundworms (Nematoda) have a complete digestive tract (tube within a tube).

Q62. The common liver fluke is:

A) Taenia
B) Fasciola hepatica ✅
C) Planaria
D) Ascaris

Explanation: Fasciola hepatica is a parasitic liver fluke (Platyhelminthes).

Q63. The roundworm is:

A) Ascaris ✅
B) Planaria
C) Taenia
D) Fasciola

Explanation: Ascaris lumbricoides is a roundworm (Nematoda).

Q64. Excretion in earthworm occurs by:

A) Flame cells
B) Nephridia ✅
C) Malpighian tubules
D) Kidneys

Explanation: Earthworms excrete through nephridia.

Q65. The leech belongs to phylum:

A) Nematoda
B) Platyhelminthes
C) Annelida ✅
D) Mollusca

Explanation: Leech is an annelid, though it has adaptations for ectoparasitism.

Q66. Which annelid is used in medicine for blood-letting?

A) Earthworm
B) Nereis
C) Leech ✅
D) Chaetopterus

Explanation: Medicinal leech (Hirudinaria) secretes hirudin to prevent blood clotting.

Q67. Which mollusc is shell-less?

A) Octopus ✅
B) Snail
C) Pila
D) Mussel

Explanation: Octopus is a cephalopod mollusc without an external shell.

Q68. The largest phylum of invertebrates is:

A) Mollusca
B) Annelida
C) Arthropoda ✅
D) Echinodermata

Explanation: Arthropoda is the largest phylum (~80% of all animal species).

Q69. The respiratory organs of prawn are:

A) Tracheae
B) Book lungs
C) Gills ✅
D) Skin

Explanation: Prawns (crustaceans) respire through gills.

Q70. Which animals are called “jointed-legged animals”?

A) Annelids
B) Arthropods ✅
C) Molluscs
D) Echinoderms

Explanation: Arthropods (arthro = joint, poda = legs) have jointed appendages.

Q71. The blood of cockroach is:

A) Red
B) Green
C) Colourless ✅
D) Blue

Explanation: Cockroach blood lacks hemoglobin, so it is colourless.

Q72. Which arthropod is a vector of malaria?

A) Housefly
B) Mosquito (Anopheles) ✅
C) Wasp
D) Tick

Explanation: Female Anopheles mosquito transmits Plasmodium (malaria parasite).

Q73. Which arthropod spreads plague?

A) Mosquito
B) Housefly
C) Rat flea ✅
D) Sandfly

Explanation: Rat flea (Xenopsylla) transmits the plague bacterium Yersinia pestis.

Q74. The locomotory organs of starfish are:

A) Tube feet ✅
B) Parapodia
C) Tentacles
D) Cilia

Explanation: Echinoderms use tube feet (water vascular system) for movement.

Q75. The body cavity of echinoderms is:

A) Acoelom
B) Pseudocoelom
C) Coelom ✅
D) Hemocoel

Explanation: Echinoderms are true coelomates, with a coelom derived from mesoderm.

🐾 Diversity of the Living World – Animal Kingdom

Part 4 (Q76–Q100)

Q76. Which of the following is a chordate?

A) Ascaris
B) Cockroach
C) Amphioxus ✅
D) Earthworm

Explanation: Amphioxus (Branchiostoma) belongs to Chordata but is invertebrate (Protochordate).

Q77. Notochord in chordates is replaced by:

A) Gill slits
B) Spinal cord
C) Vertebral column ✅
D) Skull

Explanation: In vertebrates, the notochord is replaced by the vertebral column.

Q78. Which of the following is a cartilaginous fish?

A) Rohu
B) Shark ✅
C) Catla
D) Salmon

Explanation: Shark belongs to Chondrichthyes, fishes with cartilaginous skeleton.

Q79. Which fish has an operculum?

A) Shark
B) Rohu ✅
C) Dogfish
D) Stingray

Explanation: Bony fishes (Osteichthyes) like Rohu have an operculum covering gills.

Q80. The excretory organ of amphibians is:

A) Nephridia
B) Kidney ✅
C) Malpighian tubules
D) Green gland

Explanation: Amphibians (frog) excrete via mesonephric kidneys.

Q81. Which of the following is a “tailed amphibian”?

A) Salamander ✅
B) Frog
C) Toad
D) Caecilian

Explanation: Salamanders belong to order Urodela, amphibians with tails.

Q82. Reptiles are the first vertebrates to:

A) Live on land completely ✅
B) Show double circulation
C) Show external fertilization
D) Have lungs

Explanation: Reptiles are the first to become fully terrestrial vertebrates.

Q83. Which reptile has a 4-chambered heart?

A) Snake
B) Turtle
C) Crocodile ✅
D) Lizard

Explanation: Crocodiles have a four-chambered heart, unlike other reptiles.

Q84. Which of the following is a poisonous snake?

A) Python
B) Cobra ✅
C) Rat snake
D) Anaconda

Explanation: Cobra is a venomous snake; python and rat snake are non-poisonous.

Q85. The exoskeleton of birds is made of:

A) Keratin ✅
B) Chitin
C) Collagen
D) Calcium

Explanation: Feathers, beak, claws of birds are made of keratin.

Q86. Which of the following animals are warm-blooded?

A) Amphibians
B) Reptiles
C) Birds ✅
D) Fishes

Explanation: Birds and mammals are homeothermic (warm-blooded).

Q87. Which of the following is a mammalian character?

A) Scales
B) Hair and mammary glands ✅
C) Feathers
D) Cold-blooded

Explanation: Mammals are unique in having hair, mammary glands, and diaphragm.

Q88. Which mammal lays eggs?

A) Whale
B) Platypus ✅
C) Bat
D) Cat

Explanation: Platypus and Echidna (monotremes) are egg-laying mammals.

Q89. Which mammals are aquatic?

A) Elephant
B) Dolphin ✅
C) Tiger
D) Bat

Explanation: Dolphins and whales are aquatic mammals.

Q90. Which animal has a diaphragm?

A) Bird
B) Mammal ✅
C) Reptile
D) Amphibian

Explanation: Diaphragm is a muscular structure found only in mammals for respiration.

Q91. The body temperature of cold-blooded animals depends on:

A) Internal metabolism
B) Environment ✅
C) Food
D) None

Explanation: Poikilothermic (cold-blooded) animals depend on environmental temperature.

Q92. Which class of vertebrates have scales, gills, and fins?

A) Amphibia
B) Pisces ✅
C) Reptilia
D) Mammalia

Explanation: Fishes (Pisces) have scales, gills, and fins.

Q93. Which vertebrates show metamorphosis?

A) Amphibians ✅
B) Reptiles
C) Birds
D) Mammals

Explanation: Amphibians (e.g., frog) show metamorphosis from tadpole to adult.

Q94. Which group has three-chambered heart?

A) Fishes
B) Amphibians ✅
C) Mammals
D) Birds

Explanation: Amphibians and most reptiles have a 3-chambered heart.

Q95. The kidney of birds and reptiles is:

A) Pronephric
B) Mesonephric
C) Metanephric ✅
D) None

Explanation: Birds and reptiles have metanephric kidneys.

Q96. Which mammal lacks external ears?

A) Bat
B) Whale ✅
C) Tiger
D) Elephant

Explanation: Whales and dolphins lack external ears (pinnae).

Q97. Which vertebrate group shows external fertilization?

A) Reptiles
B) Birds
C) Amphibians ✅
D) Mammals

Explanation: Amphibians mostly have external fertilization (e.g., frog).

Q98. Which mammal is capable of flight?

A) Squirrel
B) Bat ✅
C) Whale
D) Kangaroo

Explanation: Bats (Chiroptera) are the only true flying mammals.

Q99. The animals with placenta are called:

A) Monotremes
B) Marsupials
C) Placental mammals ✅
D) Cold-blooded

Explanation: Most mammals are placental, nourishing the embryo via placenta.

Q100. Which vertebrate group is the most advanced?

A) Amphibia
B) Reptilia
C) Aves
D) Mammalia ✅

Explanation: Mammals are the most advanced vertebrates with hair, mammary glands, and highly developed brain.

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