1. Which of the following characters is not a general feature of animals?
A) Multicellular
B) Autotrophic
C) Eukaryotic
D) Lack of cell wall
Answer: B
Explanation: Animals are heterotrophic; they depend on plants/other organisms for food.
2. The simplest multicellular animals belong to phylum __________.
A) Porifera
B) Cnidaria
C) Platyhelminthes
D) Protozoa
Answer: A
Explanation: Sponges (Porifera) are the simplest multicellular animals with cellular level of organization.
3. Sponges have _________.
A) Radial symmetry
B) Asymmetry
C) Bilateral symmetry
D) Biradial symmetry
Answer: B
Explanation: Sponges generally show asymmetry; some may have radial symmetry in larvae.
4. Choanocytes (collar cells) are characteristic of _________.
A) Cnidaria
B) Porifera
C) Platyhelminthes
D) Echinodermata
Answer: B
Explanation: Choanocytes help in water current and food capture in sponges.
5. Which phylum shows tissue level of organization for the first time?
A) Porifera
B) Cnidaria
C) Annelida
D) Arthropoda
Answer: B
Explanation: Cnidarians (Hydra, jellyfish) have tissue-level organization.
6. Cnidoblasts (stinging cells) are present in _________.
A) Porifera
B) Cnidaria
C) Mollusca
D) Platyhelminthes
Answer: B
Explanation: Specialized stinging cells for defense and prey capture.
7. Which phylum shows the first true body cavity (coelom)?
A) Platyhelminthes
B) Annelida
C) Nematoda
D) Mollusca
Answer: B
Explanation: Annelids are the first true coelomates (eucoelomates).
8. Flatworms belong to which phylum?
A) Platyhelminthes
B) Nematoda
C) Annelida
D) Arthropoda
Answer: A
Explanation: Flatworms include planaria, liver fluke, tapeworm.
9. Tapeworm is __________.
A) Endoparasite
B) Ectoparasite
C) Free-living
D) None
Answer: A
Explanation: Taenia solium lives inside human intestine.
10. Bilateral symmetry first appeared in __________.
A) Cnidaria
B) Porifera
C) Platyhelminthes
D) Echinodermata
Answer: C
Explanation: Flatworms are the first bilaterally symmetrical animals.
11. Which phylum shows acoelomate condition?
A) Platyhelminthes
B) Nematoda
C) Annelida
D) Arthropoda
Answer: A
Explanation: Flatworms lack a coelom → acoelomates.
12. Hydra belongs to phylum _________.
A) Porifera
B) Cnidaria
C) Annelida
D) Mollusca
Answer: B
Explanation: Hydra = freshwater cnidarian with tentacles and cnidoblasts.
13. Comb jellies belong to phylum ___________.
A) Porifera
B) Cnidaria
C) Ctenophora
D) Platyhelminthes
Answer: C
Explanation: Ctenophores are marine, with 8 comb plates of cilia.
14. Bioluminescence is seen in _________.
A) Hydra
B) Ctenophores
C) Sponges
D) Annelids
Answer: B
Explanation: Ctenophores (sea walnuts) show bioluminescence.
15. Flame cells are characteristic of __________.
A) Annelida
B) Platyhelminthes
C) Arthropoda
D) Mollusca
Answer: B
Explanation: Flame cells help in excretion and osmoregulation in flatworms.
16. Which cnidarian shows colonial form?
A) Hydra
B) Aurelia
C) Physalia
D) Planaria
Answer: C
Explanation: Physalia (Portuguese Man-of-War) is a colonial cnidarian.
17. Free-living flatworm is __________.
A) Planaria
B) Fasciola
C) Taenia
D) Schistosoma
Answer: A
Explanation: Planaria is non-parasitic, free-living flatworm.
18. Liver fluke (Fasciola hepatica) belongs to class __________.
A) Cestoda
B) Trematoda
C) Turbellaria
D) Monogenea
Answer: B
Explanation: Trematodes = parasitic flatworms (flukes).
19. Which cnidarian has both polyp and medusa stages?
A) Aurelia
B) Hydra
C) Physalia
D) Obelia
Answer: D
Explanation: Obelia shows alternation between polyp and medusa (metagenesis).
20. Symmetry in cnidarians is __________.
A) Radial
B) Bilateral
C) Asymmetry
D) Spherical
Answer: A
Explanation: Cnidarians are radially symmetrical.
21. Fertilization in sponges is ___________.
A) External
B) Internal
C) Both
D) None
Answer: B
Explanation: Sponges release sperms into water, fertilization occurs inside body.
22. Body cavity lined by mesoderm is _________.
A) Pseudocoelom
B) Coelom
C) Acoelom
D) Haemocoel
Answer: B
Explanation: True coelom lined by mesoderm → found in annelids onward.
23. Animals lacking body cavity are ___________.
A) Acoelomates
B) Pseudocoelomates
C) Coelomates
D) Diploblasts
Answer: A
Explanation: Example: Platyhelminthes.
24. Which is diploblastic?
A) Hydra
B) Planaria
C) Earthworm
D) Insect
Answer: A
Explanation: Cnidarians (Hydra) have two germ layers (ectoderm + endoderm).
25. Which animal is triploblastic?
A) Sponges
B) Hydra
C) Tapeworm
D) Amoeba
Answer: C
Explanation: From Platyhelminthes onward, animals are triploblastic.
26. The body cavity of roundworms (Ascaris) is ___________.
A) Acoelomate
B) Pseudocoelomate
C) Coelomate
D) Haemocoel
Answer: B
Explanation: Nematodes have pseudocoelom → not fully lined by mesoderm.
27. Excretory organs of annelids are __________.
A) Flame cells
B) Nephridia
C) Malpighian tubules
D) Kidneys
Answer: B
Explanation: Annelids (earthworm) excrete via nephridia.
28. The circulatory system of earthworm is ______________.
A) Open type
B) Closed type
C) Absent
D) Lymphatic
Answer: B
Explanation: Earthworm has a closed circulatory system with blood vessels.
29. Body of annelids is __________.
A) Segmented externally only
B) Segmented internally only
C) Segmented both externally & internally
D) Unsegmented
Answer: C
Explanation: Metameric segmentation is a feature of annelids.
30. Roundworms are placed under phylum ____________.
A) Platyhelminthes
B) Nematoda
C) Annelida
D) Mollusca
Answer: B
Explanation: Roundworms (Ascaris, Wuchereria) belong to phylum Nematoda.
31. Elephantiasis is caused by ________.
A) Taenia solium
B) Fasciola hepatica
C) Wuchereria bancrofti
D) Planaria
Answer: C
Explanation: Filariasis/elephantiasis is caused by filarial worm Wuchereria.
32. Earthworm belongs to class _________.
A) Polychaeta
B) Hirudinea
C) Oligochaeta
D) Nematoda
Answer: C
Explanation: Earthworm → subclass Oligochaeta of phylum Annelida.
33. Leeches belong to _________.
A) Hirudinea
B) Oligochaeta
C) Polychaeta
D) Nematoda
Answer: A
Explanation: Leeches are blood-sucking annelids → class Hirudinea.
34. The largest phylum of Animal Kingdom is _________.
A) Annelida
B) Arthropoda
C) Mollusca
D) Echinodermata
Answer: B
Explanation: Arthropoda includes insects, crustaceans, arachnids → ~80% of known animals.
35. Respiratory organs in prawn are __________.
A) Tracheae
B) Book lungs
C) Gills
D) Skin
Answer: C
Explanation: Crustaceans like prawns respire through gills.
36. Excretory organs of insects are __________.
A) Kidneys
B) Flame cells
C) Malpighian tubules
D) Nephridia
Answer: C
Explanation: Insects excrete nitrogenous wastes through Malpighian tubules.
37. Blood of cockroach is __________.
A) Red with hemoglobin
B) Blue with hemocyanin
C) Colorless without hemoglobin
D) Green
Answer: C
Explanation: Cockroach has colorless haemolymph; oxygen is carried via tracheae, not blood.
38. Circulatory system of arthropods is __________.
A) Closed
B) Open
C) Absent
D) Lymphatic
Answer: B
Explanation: Arthropods (cockroach, prawn) have open circulation with haemocoel.
39. Which of the following is NOT an arthropod?
A) Prawn
B) Spider
C) Earthworm
D) Scorpion
Answer: C
Explanation: Earthworm is annelid, not arthropod.
40. Radula is a rasping organ in __________.
A) Annelida
B) Mollusca
C) Arthropoda
D) Echinodermata
Answer: B
Explanation: Radula → toothed tongue-like organ for scraping food in mollusks.
41. Octopus belongs to class __________.
A) Pelecypoda
B) Cephalopoda
C) Gastropoda
D) Amphibia
Answer: B
Explanation: Octopus = highly intelligent cephalopod mollusk.
42. Largest invertebrate is __________.
A) Octopus
B) Squid (Architeuthis)
C) Starfish
D) Prawn
Answer: B
Explanation: Giant squid is the largest invertebrate, up to 18 m long.
43. Water vascular system is characteristic of __________.
A) Mollusca
B) Arthropoda
C) Echinodermata
D) Annelida
Answer: C
Explanation: Starfish, sea urchins use water vascular system for locomotion & food capture.
44. Symmetry of echinoderms is ___________.
A) Radial in adults, bilateral in larvae
B) Bilateral in adults, radial in larvae
C) Only radial
D) Only bilateral
Answer: A
Explanation: Echinoderm larvae → bilateral; adults → pentamerous radial symmetry.
45. Endoskeleton of echinoderms is made up of ___________.
A) Chitin
B) Silica
C) Calcium carbonate
D) Keratin
Answer: C
Explanation: Echinoderms have calcareous endoskeleton of ossicles.
46. Starfish belongs to phylum ____________.
A) Mollusca
B) Echinodermata
C) Annelida
D) Arthropoda
Answer: B
Explanation: Starfish = echinoderm with water vascular system.
47. Which phylum shows pentamerous radial symmetry?
A) Cnidaria
B) Arthropoda
C) Echinodermata
D) Mollusca
Answer: C
Explanation: Adult echinoderms show pentaradial symmetry.
48. Which animal has book lungs?
A) Prawn
B) Spider
C) Cockroach
D) Earthworm
Answer: B
Explanation: Arachnids (spiders, scorpions) respire through book lungs.
49. Pearls are formed in __________.
A) Snail
B) Octopus
C) Oyster
D) Starfish
Answer: C
Explanation: Pearls are secreted by mantle of pearl oyster (Pinctada).
50. Which phylum shows true coelom, bilateral symmetry, and segmented body?
A) Annelida
B) Nematoda
C) Arthropoda
D) Mollusca
Answer: A
Explanation: Earthworm (annelid) → first true coelomates with metamerism.
51. The defining character of chordates is __________.
A) Notochord
B) Backbone
C) Paired fins
D) Hair
Answer: A
Explanation: All chordates have notochord at some stage in life, though in vertebrates it is replaced by vertebral column.
52. Which is not a chordate character?
A) Dorsal hollow nerve cord
B) Ventral solid nerve cord
C) Pharyngeal gill slits
D) Post-anal tail
Answer: B
Explanation: Chordates have a dorsal hollow nerve cord; ventral solid nerve cord is seen in non-chordates.
53. Which subphylum includes all vertebrates?
A) Urochordata
B) Cephalochordata
C) Vertebrata
D) Hemichordata
Answer: C
Explanation: Vertebrates = chordates with cranium and vertebral column.
54. Cyclostomes (lampreys & hagfish) are __________.
A) Jawed vertebrates
B) Jawless vertebrates
C) Cartilaginous fishes
D) Amphibians
Answer: B
Explanation: Cyclostomes are agnathans (jawless vertebrates), e.g., Petromyzon.
55. Heart of fishes is _________.
A) 2-chambered
B) 3-chambered
C) 4-chambered
D) Variable
Answer: A
Explanation: Fish heart has 1 atrium + 1 ventricle, single circulation.
56. Fishes respire mainly through _________.
A) Lungs
B) Gills
C) Skin
D) Tracheae
Answer: B
Explanation: Gills extract dissolved oxygen from water.
57. Which group of fishes has a cartilaginous skeleton?
A) Osteichthyes
B) Cyclostomes
C) Chondrichthyes
D) Amphibia
Answer: C
Explanation: Sharks, rays (Chondrichthyes) have cartilage skeleton.
58. Which of the following are bony fishes?
A) Shark
B) Dogfish
C) Rohu and Catla
D) Sting ray
Answer: C
Explanation: Bony fishes (Osteichthyes) include Rohu, Catla, tuna.
59. The first land vertebrates are _________.
A) Amphibians
B) Reptiles
C) Mammals
D) Birds
Answer: A
Explanation: Amphibians were the first chordates to adapt to land but still depend on water for reproduction.
60. Heart of amphibians is __________.
A) 2-chambered
B) 3-chambered
C) 4-chambered
D) 5-chambered
Answer: B
Explanation: Amphibian heart has 2 atria + 1 ventricle → incomplete separation.
61. Respiration in frog occurs through ___________.
A) Only lungs
B) Only skin
C) Only gills
D) Lungs, skin, and gills (larvae)
Answer: D
Explanation: Adult frog → lungs + skin; tadpole → gills.
62. Reptiles are called first true land vertebrates because ____________.
A) They have lungs
B) They are cold-blooded
C) They lay cleidoic (shelled) eggs on land
D) They have 3-chambered heart
Answer: C
Explanation: Reptiles are independent of water for reproduction due to shelled eggs.
63. Crocodiles differ from other reptiles in having ___________.
A) 2-chambered heart
B) 3-chambered heart
C) 4-chambered heart
D) No heart
Answer: C
Explanation: Crocodiles → only reptiles with a completely 4-chambered heart.
64. The exoskeleton of reptiles is made of ____________.
A) Chitin
B) Keratinized scales
C) Calcium carbonate
D) Cartilage
Answer: B
Explanation: Reptiles are covered with dry, keratinized scales → prevent water loss.
65. Which reptile is limbless?
A) Turtle
B) Crocodile
C) Snake
D) Lizard
Answer: C
Explanation: Snakes evolved limblessness for burrowing and locomotion.
66. Birds belong to class _________.
A) Reptilia
B) Aves
C) Amphibia
D) Mammalia
Answer: B
Explanation: Birds form class Aves in phylum Chordata.
67. Which modification is characteristic of birds?
A) Pneumatic (hollow) bones
B) Lungs with air sacs
C) Forelimbs modified as wings
D) All of these
Answer: D
Explanation: All are adaptations for flight in birds.
68. Birds are __________.
A) Poikilothermic (cold-blooded)
B) Homeothermic (warm-blooded)
C) Variable temperature animals
D) None
Answer: B
Explanation: Birds maintain constant body temperature.
9. Heart of birds is _______.
A) 2-chambered
B) 3-chambered
C) 4-chambered
D) 5-chambered
Answer: C
Explanation: Birds have completely separated systemic & pulmonary circulation.
70. Birds are toothless but have ____________.
A) Beak
B) Horns
C) Tongue
D) Radula
Answer: A
Explanation: Birds → beaks adapted to feeding habits, no teeth.
71. Mammals are characterized by ___________.
A) Hair on body
B) Mammary glands
C) Presence of diaphragm
D) All of these
Answer: D
Explanation: All are unique mammalian features.
72. Heart of mammals is _________.
A) 2-chambered
B) 3-chambered
C) 4-chambered
D) 5-chambered
Answer: C
Explanation: Mammals have complete separation of oxygenated and deoxygenated blood.
73. Fertilization in mammals is ___________.
A) External
B) Internal
C) Both
D) None
Answer: B
Explanation: Fertilization and development are internal in mammals (except monotremes lay eggs).
74. Which mammal lays eggs?
A) Kangaroo
B) Platypus
C) Whale
D) Lion
Answer: B
Explanation: Monotremes (Platypus, Echidna) are egg-laying mammals.
75. Which mammal is aquatic and has flippers?
A) Bat
B) Whale
C) Elephant
D) Tiger
Answer: B
Explanation: Cetaceans (whales, dolphins) are fully aquatic mammals with flippers.
76. Animals with body temperature independent of environment are called ___________.
A) Poikilotherms
B) Homeotherms
C) Cold-blooded
D) None
Answer: B
Explanation: Homeotherms (birds, mammals) maintain constant internal temperature.
77. Which of the following is a poikilothermic animal?
A) Bird
B) Mammal
C) Frog
D) Human
Answer: C
Explanation: Amphibians, reptiles, fishes are poikilotherms (cold-blooded).
78. Which group has a 3-chambered heart usually?
A) Amphibians
B) Birds
C) Mammals
D) Fishes
Answer: A
Explanation: Amphibians → 2 atria + 1 ventricle → 3-chambered heart.
79. Which group has both 3- and 4-chambered hearts?
A) Reptiles
B) Birds
C) Mammals
D) Amphibians
Answer: A
Explanation: Most reptiles → 3-chambered; crocodiles → 4-chambered.
80. Air bladder is present in ____________.
A) Cartilaginous fishes
b) Bony fishes
C) Amphibians
D) Mammals
Answer: B
Explanation: Air bladder in Osteichthyes helps in buoyancy.
81. Which animal respires through skin?
A) Fish
B) Frog
C) Bird
D) Snake
Answer: B
Explanation: Amphibians like frog breathe through skin (cutaneous respiration).
82. Metamorphosis is absent in ____________.
A) Frog
B) Butterfly
C) Cockroach
D) Pigeon
Answer: D
Explanation: Birds and mammals develop directly, without metamorphosis.
83. Which animal shows metamorphosis?
A) Earthworm
B) Cockroach
C) Starfish
D) Both b and c
Answer: D
Explanation: Insects (cockroach, butterfly) and echinoderms (starfish) show metamorphosis.
84. Which animal is called “flying mammal”?
A) Whale
B) Bat
C) Kangaroo
D) Platypus
Answer: B
Explanation: Bats are true flying mammals (Chiroptera).
85. Which animal is called “ship of the desert”?
A) Horse
B) Camel
C) Donkey
D) Yak
Answer: B
Explanation: Camels adapted for deserts; store fat in hump, tolerate water loss.
86. Which mammal is egg-laying?
A) Kangaroo
B) Whale
C) Platypus
D) Tiger
Answer: C
Explanation: Monotremes (platypus, echidna) lay eggs.
87. Marsupials are mammals that ___________.
A) Lay eggs
B) Have pouches for young
C) Live in water
D) Are toothless
Answer: B
Explanation: Kangaroo, Koala are marsupials with abdominal pouches.
88. Which is the largest living bird?
A) Emu
B) Ostrich
C) Kiwi
D) Eagle
Answer: B
Explanation: Ostrich (Struthio) is the largest bird, up to 2.7 m tall.
89. Which is the smallest bird?
A) Sparrow
B) Sunbird
C) Hummingbird
D) Crow
Answer: C
Explanation: Hummingbird (~5 cm) is the smallest bird.
90. Which mammal has no vocal cords?
A) Whale
B) Dolphin
C) Giraffe
D) Elephant
Answer: C
Explanation: Giraffes are nearly voiceless as they lack developed vocal cords.
91. Which mammal is aquatic but breathes air?
A) Whale
B) Shark
C) Octopus
D) Dolphin
Answer: A
Explanation: Whales are mammals with lungs, not gills, so they breathe air.
92. Which of the following is a viviparous animal?
A) Fish (shark)
B) Frog
C) Cow
D) Hen
Answer: C
Explanation: Viviparous → give birth to young; cow is viviparous mammal.
93. Oviparous animals include ____________.
A) Birds
B) Amphibians
C) Reptiles
D) All of these
Answer: D
Explanation: Oviparous → lay eggs → birds, amphibians, reptiles.
94. Which animal has the largest brain-to-body ratio?
A) Elephant
B) Dolphin
C) Human
D) Whale
Answer: C
Explanation: Humans have the highest brain-to-body ratio.
95. Which animal is known as “living fossil”?
A) Coelacanth fish
B) Crocodile
C) Duck-billed Platypus
D) Kangaroo
Answer: A
Explanation: Coelacanth, a lobe-finned fish, considered living fossil.
96. Which phylum shows regeneration in adults?
A) Arthropoda
B) Mollusca
C) Echinodermata
D) Annelida
Answer: C
Explanation: Starfish regenerate arms; echinoderms show high regeneration power.
97. Which vertebrate group has both aquatic and terrestrial members?
A) Reptiles
B) Amphibians
C) Mammals
D) Birds
Answer: B
Explanation: Amphibians (frogs, salamanders) live both on land and in water.
98. Which reptile is considered a “living fossil”?
A) Turtle
B) Crocodile
C) Tuatara (Sphenodon)
D) Lizard
Answer: C
Explanation: Tuatara of New Zealand is the only surviving member of order Rhynchocephalia.
99. Which mammal can fly?
A) Bat
B) Flying squirrel
C) Kangaroo
D) Whale
Answer: A
Explanation: Bat is the only true flying mammal; flying squirrels only glide.
100. Which of the following statements about Animal Kingdom is true?
A) All vertebrates are chordates, but not all chordates are vertebrates
B) All chordates are vertebrates
C) All invertebrates are acoelomates
D) All non-chordates are radially symmetrical
Answer: A
Explanation: Urochordata and Cephalochordata are chordates but not vertebrates.