Chapter 4: Animal Kingdom – MCQs
🐾 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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