NEET MCQs Practice Session| Chapter 4 Animal Kingdom | Biology Class 11

Here You Get So Many MCQs Questions Based On NEET Of Class 11 Biology, Chapter 4, Animal Kindom.    Practice NEET-level MCQs for Chapter 4 – Animal Kingdom from Biology Class 11. Understand animal classification, phyla, chordates, and invertebrates with 100+ high-quality questions and answers, designed for effective NEET preparation and revision.

If You  Want To Read Our Quality Notes Of Chapter 2, Animal Kingdom, Click Here 🥰

1. Which level of organization is seen in sponges (Phylum Porifera)?
a) Tissue level
b) Cellular level ✅
c) Organ system level
d) Organ level

2. In which animal phylum is the organ level of organization first observed?
a) Cnidaria
b) Porifera
c) Platyhelminthes ✅
d) Annelida

3. Which of the following animals exhibit bilateral symmetry?
a) Hydra
b) Jellyfish
c) Platyhelminthes ✅
d) Sponges

4. Animals that show radial symmetry are usually:
a) Free-moving predators
b) Sessile or slow-moving ✅
c) All terrestrial animals
d) Coelomates

5. Diploblastic animals develop from which germ layers?
a) Ectoderm, mesoderm, endoderm
b) Ectoderm and endoderm ✅
c) Mesoderm only
d) Endoderm only

6. Triploblastic animals are characterized by the presence of:
a) Two germ layers
b) Three germ layers ✅
c) No germ layers
d) Four germ layers

7. Which of the following is an acoelomate animal?
a) Ascaris
b) Earthworm
c) Flatworm (Platyhelminthes) ✅
d) Starfish

8. Pseudocoelomates differ from coelomates because:
a) They have a fully lined body cavity
b) Their body cavity is not completely lined with mesoderm ✅
c) They have no body cavity
d) They exhibit true segmentation

9. True coelom is found in:
a) Platyhelminthes
b) Annelids ✅
c) Nematodes
d) Tapeworm

10. Which of the following animals exhibits pseudosegmentation?
a) Earthworm
b) Tapeworm (Taenia) ✅
c) Insects
d) Humans

11. Segmentation is clearly observed in which group of animals?
a) Molluscs
b) Platyhelminthes
c) Annelids ✅
d) Nematodes

12. The notochord in vertebrates is replaced by:
a) Spinal cord
b) Vertebral column ✅
c) Mesoderm
d) Neural tube

13. Notochord is present throughout life in:
a) Vertebrates
b) Urochordates
c) Cephalochordates ✅
d) Non-chordates

14. In which of the following animals is the notochord present only in the larval tail?
a) Cephalochordates
b) Urochordates ✅
c) Vertebrates
d) Non-chordates

15. The body of animals showing organ system level organization:
a) Lacks specialized organs
b) Shows well-developed systems like digestive, circulatory ✅
c) Consists of loosely arranged cells
d) Has only two germ layers

16. Phylum Porifera includes animals commonly known as:
a) Jellyfish
b) Sponges ✅
c) Flatworms
d) Starfish

17. The level of organization in sponges is:
a) Tissue level
b) Organ level
c) Cellular level ✅
d) Organ system level

18. Sponges are generally:
a) Bilaterally symmetrical
b) Radially symmetrical
c) Asymmetrical ✅
d) Pseudocoelomate

19. Water enters a sponge’s body through small pores called:
a) Osculum
b) Ostia ✅
c) Spongocoel
d) Choanocytes

20. The central cavity in a sponge is called:
a) Osculum
b) Spongocoel ✅
c) Gemmule
d) Mesoglea

21. Water leaves a sponge through:
a) Ostia
b) Spongocoel
c) Osculum ✅
d) Collar cells

22. The cells responsible for trapping food in sponges are:
a) Choanocytes ✅
b) Amoebocytes
c) Pinacocytes
d) Spicules

23. Digestion in sponges occurs:
a) Extracellularly
b) Intracellularly ✅
c) Both a and b
d) Does not occur

24. The internal skeleton of sponges is made of:
a) Chitin
b) Spicules or spongin fibers ✅
c) Collagen
d) Calcium carbonate only

25. Sponges are usually:
a) Dioecious
b) Hermaphrodites ✅
c) Asexual only
d) Unicellular

26. Asexual reproduction in sponges occurs by:
a) Budding only
b) Fragmentation ✅
c) Binary fission
d) Spore formation

27. In sexual reproduction of sponges, fertilization is:
a) External
b) Internal ✅
c) Both internal and external
d) Absent

28. Sponges show indirect development, meaning:
a) Larvae resemble adult
b) Larvae look different from adult ✅
c) No larval stage
d) Only asexual reproduction occurs

29. Which of the following is a freshwater sponge?
a) Sycon
b) Spongilla ✅
c) Euspongia
d) Scypha

30. Euspongia is commonly known as:
a) Bath sponge ✅
b) Sea cucumber
c) Coral
d) Jellyfish

31. Phylum Cnidaria is also known as:
a) Porifera
b) Coelenterata ✅
c) Platyhelminthes
d) Annelida

32. The symmetry exhibited by cnidarians is:
a) Bilateral
b) Radial ✅
c) Asymmetrical
d) Pseudocoelomate

33. The germ layer organization in cnidarians is:
a) Diploblastic ✅
b) Triploblastic
c) Acoelomate
d) Coelomate

34. The jelly-like layer present between ectoderm and endoderm is called:
a) Mesoderm
b) Mesoglea ✅
c) Chitin
d) Spongin

35. Level of organization in cnidarians is:
a) Cellular
b) Tissue ✅
c) Organ
d) Organ system

36. The central cavity in cnidarians, functioning as both mouth and anus, is called:
a) Spongocoel
b) Coelom
c) Gastrovascular cavity ✅
d) Osculum

37. The mouth of cnidarians is located on a raised structure called:
a) Pedal disc
b) Hypostome ✅
c) Siphonoglyph
d) Tentacle

38. Specialized stinging cells in cnidarians are called:
a) Amoebocytes
b) Cnidocytes ✅
c) Choanocytes
d) Spicules

39. Nematocysts in cnidocytes are used for:
a) Locomotion only
b) Digestion only
c) Prey capture, defense, and attachment ✅
d) Photosynthesis

40. Digestion in cnidarians occurs:
a) Extracellularly only
b) Intracellularly only
c) Both extracellular and intracellular ✅
d) Does not occur

41. Cnidarians exhibit two basic body forms called:
a) Larva and adult
b) Polyp and medusa ✅
c) Protonema and leafy
d) Gemmule and sporophyte

42. Polyp body form is:
a) Free-swimming and umbrella-shaped
b) Sessile and cylindrical ✅
c) Radially asymmetrical
d) Bilaterally symmetrical

43. Medusa body form is:
a) Sessile
b) Cylindrical
c) Umbrella-shaped and free-swimming ✅
d) Flattened

44. Some cnidarians, like Obelia, show:
a) Direct development
b) Alternation of generations ✅
c) Binary fission only
d) Fragmentation only

45. Which of the following is an example of cnidarians that secrete calcium carbonate exoskeletons?
a) Hydra
b) Coral (Meandrina) ✅
c) Jellyfish
d) Adamsia

46. Portuguese man-of-war belongs to:
a) Porifera
b) Cnidaria ✅
c) Annelida
d) Mollusca

47. Phylum Ctenophora is commonly known as:
a) Sponges
b) Comb jellies ✅
c) Jellyfish
d) Flatworms

48. Ctenophores are mostly found in:
a) Freshwater
b) Terrestrial habitats
c) Marine environments ✅
d) Brackish water only

49. Symmetry exhibited by ctenophores is:
a) Bilateral
b) Radial ✅
c) Asymmetrical
d) Pseudocoelomate

50. Ctenophores have which type of germ layer organization?
a) Triploblastic
b) Diploblastic ✅
c) Acoelomate
d) Coelomate

51. Level of organization in ctenophores is:
a) Cellular
b) Tissue ✅
c) Organ
d) Organ system

52. Ctenophores lack which specialized cells that are present in cnidarians?
a) Choanocytes
b) Cnidoblasts ✅
c) Nematocysts
d) Spicules

53. Locomotion in ctenophores is primarily through:
a) Muscular contraction
b) Flagella
c) Ciliated comb plates ✅
d) Pseudopodia

54. Number of ciliated comb rows in ctenophores is:
a) Four
b) Six
c) Eight ✅
d) Ten

55. Digestion in ctenophores occurs:
a) Extracellularly only
b) Intracellularly only
c) Both extracellular and intracellular ✅
d) Does not occur

56. Ctenophores reproduce by:
a) Asexual budding
b) Binary fission
c) Sexual reproduction with external fertilization ✅
d) Alternation of generations

57. Ctenophores are hermaphroditic, meaning:
a) Male and female individuals are separate
b) Each individual produces only eggs
c) Each individual produces both eggs and sperm ✅
d) They reproduce asexually only

58. Development in ctenophores is:
a) Direct
b) Indirect, involving larval stage ✅
c) Alternation of generations
d) Parthenogenetic

59. Bioluminescence in ctenophores refers to:
a) Their ability to move rapidly
b) Their ability to emit light ✅
c) Their ability to sting
d) Their ability to photosynthesize

60. Examples of ctenophores include:
a) Hydra and Aurelia
b) Pleurobrachia and Ctenoplana ✅
c) Spongilla and Sycon
d) Planaria and Taenia

61. Phylum Platyhelminthes animals are commonly called:
a) Roundworms
b) Flatworms ✅
c) Segmented worms
d) Sponges

62. The symmetry of Platyhelminthes is:
a) Asymmetrical
b) Radial
c) Bilateral ✅
d) Pseudosegmented

63. Body cavity in Platyhelminthes is:
a) Coelomate
b) Pseudocoelomate
c) Acoelomate ✅
d) Hemocoel

64. Platyhelminthes exhibit which level of organization?
a) Cellular
b) Tissue
c) Organ ✅
d) Organ system

65. Excretory cells in Platyhelminthes are called:
a) Flame cells ✅
b) Choanocytes
c) Malpighian tubules
d) Nephridia

66. Most Platyhelminthes are:
a) Dioecious
b) Hermaphrodites ✅
c) Oviparous only
d) Asexual only

67. Which of the following is a parasitic Platyhelminth?
a) Planaria
b) Taenia ✅
c) Hydra
d) Ascaris

68. Phylum Aschelminthes is commonly known as:
a) Flatworms
b) Roundworms ✅
c) Segmented worms
d) Sponges

69. Body cavity in Aschelminthes is:
a) Acoelomate
b) Pseudocoelomate ✅
c) Coelomate
d) Hemocoel

70. Symmetry of Aschelminthes is:
a) Radial
b) Bilateral ✅
c) Asymmetrical
d) None of these

71. Aschelminthes exhibit which level of body organization?
a) Cellular
b) Tissue
c) Organ
d) Organ system ✅

72. Reproduction in Aschelminthes is:
a) Hermaphroditic only
b) Dioecious ✅
c) Asexual only
d) Parthenogenetic

73. Fertilisation in both Platyhelminthes and Aschelminthes is:
a) External
b) Internal ✅
c) Self-fertilisation only
d) Absent

74. A medically important parasite belonging to Aschelminthes is:
a) Fasciola
b) Planaria
c) Wuchereria ✅
d) Sycon

75. Which statement is true about free-living Platyhelminthes like Planaria?
a) They are pseudocoelomates
b) They show remarkable regeneration ✅
c) They are dioecious
d) They are parasitic only

76. Body symmetry of Annelida is:
a) Asymmetrical
b) Radial
c) Bilateral ✅
d) None of these

77. Annelids show which level of body organization?
a) Cellular
b) Tissue
c) Organ
d) Organ system ✅

78. Body cavity of Annelida is:
a) Acoelomate
b) Pseudocoelomate
c) Coelomate ✅
d) Hemocoel

79. The body of annelids is divided into repeated segments called:
a) Metameres ✅
b) Somites
c) Parapodia
d) Spicules

80. Movement in Annelida is facilitated by:
a) Cilia
b) Longitudinal and circular muscles ✅
c) Flagella
d) Hydrostatic skeleton only

81. Closed circulatory system in annelids means:
a) Blood flows in open spaces
b) Blood flows inside vessels ✅
c) Blood is absent
d) Blood flows in heart only

82. Excretory organs in annelids are called:
a) Flame cells
b) Nephridia ✅
c) Malpighian tubules
d) Nematocysts

83. Nervous system of Annelida consists of:
a) Dorsal nerve cord
b) Paired ganglia with double ventral nerve cord ✅
c) Nerve net only
d) Brain only

84. Sexes in aquatic annelids like Nereis are:
a) Hermaphroditic
b) Monoecious
c) Dioecious ✅
d) Parthenogenetic

85. Earthworms and leeches are:
a) Dioecious
b) Monoecious ✅
c) Asexual only
d) Parasitic only

86. Side appendages called parapodia are present in:
a) Earthworm
b) Hirudinaria
c) Nereis ✅
d) Taenia

87. Common examples of annelids include:
a) Planaria, Fasciola
b) Nereis, Pheretima, Hirudinaria ✅
c) Ascaris, Wuchereria
d) Sycon, Spongilla

88. The term ‘Annelida’ is derived from:
a) Greek word for ring
b) Latin word ‘annulus’ meaning little ring ✅
c) Latin word for worm
d) Greek word for segmented body

89. Body symmetry of arthropods is:
a) Asymmetrical
b) Radial
c) Bilateral ✅
d) None of these

90. Arthropods exhibit which level of body organization?
a) Cellular
b) Tissue
c) Organ
d) Organ system ✅

91. Body cavity of arthropods is:
a) Acoelomate
b) Pseudocoelomate
c) Coelomate ✅
d) Hemocoel

92. The exoskeleton of arthropods is made up of:
a) Calcium carbonate
b) Chitin ✅
c) Spongin
d) Cellulose

93. Body of arthropods is divided into:
a) Head only
b) Head and abdomen
c) Head, thorax, and abdomen ✅
d) Thorax and abdomen only

94. Jointed appendages in arthropods are used for:
a) Movement and handling objects ✅
b) Digestion
c) Respiration only
d) Circulation

95. Respiratory organs in arthropods may include:
a) Gills, book gills, book lungs, or tracheal system ✅
b) Lungs only
c) Skin only
d) Nostrils

96. Circulatory system in arthropods is:
a) Closed
b) Open ✅
c) Absent
d) Partially closed

97. Excretory organs in arthropods are:
a) Nephridia
b) Malpighian tubules ✅
c) Flame cells
d) Kidneys

98. Sexes in arthropods are:
a) Hermaphroditic
b) Dioecious ✅
c) Monoecious
d) Parthenogenetic

99. Fertilization in arthropods is:
a) External
b) Internal ✅
c) Both external and internal
d) Asexual only

100. Some important examples of arthropods include:
a) Nereis, Pheretima
b) Apis, Bombyx, Locusta, Limulus ✅
c) Planaria, Taenia
d) Sycon, Spongilla

101. Body symmetry of molluscs is:
a) Asymmetrical
b) Radial
c) Bilateral ✅
d) None of these

102. Body organization in molluscs is at the:
a) Cellular level
b) Tissue level
c) Organ level
d) Organ system level ✅

103. Body cavity of molluscs is:
a) Acoelomate
b) Pseudocoelomate
c) Coelomate ✅
d) Hemocoel

104. Molluscan body is usually covered by:
a) Chitinous exoskeleton
b) Calcareous shell ✅
c) Spongin fibers
d) None of these

105. The muscular part used for locomotion in molluscs is called:
a) Visceral hump
b) Foot ✅
c) Mantle
d) Radula

106. The layer covering the visceral hump in molluscs is:
a) Radula
b) Mantle ✅
c) Tentacle
d) Shell

107. Function of mantle cavity in molluscs includes:
a) Locomotion only
b) Respiration and excretion ✅
c) Digestion only
d) Sensory detection

108. Feeding organ of molluscs used for scraping food is called:
a) Beak
b) Radula ✅
c) Setae
d) Proboscis

109. Sexes in molluscs are usually:
a) Hermaphroditic
b) Dioecious ✅
c) Monoecious
d) Parthenogenetic

110. Development in molluscs is:
a) Direct
b) Indirect (larval stage present) ✅
c) Parthenogenetic
d) None of these

111. Some common examples of molluscs include:
a) Nereis, Earthworm
b) Pila, Sepia, Loligo, Octopus ✅
c) Apis, Bombyx, Locusta
d) Sycon, Spongilla

112. Body symmetry of adult echinoderms is:
a) Bilateral
b) Radial ✅
c) Asymmetrical
d) Spiral

113. Body symmetry of echinoderm larvae is:
a) Radial
b) Bilateral ✅
c) Asymmetrical
d) None of these

114. Echinoderms are:
a) Diploblastic
b) Triploblastic ✅
c) Unicellular
d) None of these

115. The body cavity of echinoderms is:
a) Acoelomate
b) Pseudocoelomate
c) Coelomate ✅
d) Hemocoel

116. Skeleton of echinoderms is made up of:
a) Chitin
b) Spongin fibers
c) Calcareous ossicles ✅
d) Cartilage

117. The water vascular system in echinoderms is used for:
a) Locomotion, food transport, and respiration ✅
b) Digestion only
c) Excretion only
d) Reproduction only

118. Excretory system in echinoderms is:
a) Present
b) Absent ✅
c) Via nephridia
d) Via malpighian tubules

119. Development in echinoderms is:
a) Direct
b) Indirect (larval stage present) ✅
c) Parthenogenetic
d) None of these

120. Common examples of echinoderms include:
a) Asterias, Echinus, Antedon ✅
b) Sycon, Spongilla, Euspongia
c) Pila, Sepia, Octopus
d) Nereis, Hirudinaria, Pheretima

121. Hemichordates were earlier considered as:
a) A separate phylum ✅
b) A sub-phylum under Chordata ✅
c) A class under Echinodermata
d) None of these

122. Hemichordates show body symmetry:
a) Radial
b) Bilateral ✅
c) Asymmetrical
d) Spiral

123. Body of hemichordates is divided into:
a) Head, thorax, abdomen
b) Anterior proboscis, collar, trunk ✅
c) Foot, mantle, visceral hump
d) None of these

124. The rudimentary notochord-like structure in hemichordates is called:
a) Notochord
b) Stomochord ✅
c) Setae
d) Radula

125. Examples of hemichordates include:
a) Balanoglossus, Saccoglossus ✅
b) Asterias, Echinus
c) Pila, Sepia
d) Apis, Bombyx

126. A characteristic feature of all chordates is:
a) Notochord, dorsal hollow nerve cord, pharyngeal gill slits, post-anal tail ✅
b) Radial symmetry
c) Water vascular system
d) Hard exoskeleton

127. Protochordates include which subphyla?
a) Urochordata and Cephalochordata ✅
b) Vertebrata and Cephalochordata
c) Cyclostomata and Chondrichthyes
d) Osteichthyes and Amphibia

128. In Urochordata, notochord is present in:
a) Adult tail
b) Embryonic tail only ✅
c) Head only
d) Throughout life

129. Cephalochordates like Branchiostoma have a notochord:
a) Only in larval tail
b) Only in head
c) Throughout life ✅
d) Absent

130. Examples of Urochordata include:
a) Ascidia, Salpa, Doliolum ✅
b) Amphioxus, Branchiostoma
c) Scoliodon, Pristis
d) Labeo, Catla

131. Vertebrates differ from protochordates because:
a) They have a notochord only in larval stage
b) Notochord is replaced by vertebral column in adults ✅
c) They are diploblastic
d) They are invertebrates

132. Class Cyclostomata includes animals with:
a) Jaws and paired fins
b) Circular sucking mouth without jaws ✅
c) Cartilaginous scales
d) Bony endoskeleton

133. Examples of Cyclostomata include:
a) Petromyzon, Myxine ✅
b) Scoliodon, Carcharodon
c) Exocoetus, Hippocampus
d) Labeo, Catla

134. Chondrichthyes are characterized by:
a) Bony endoskeleton
b) Cartilaginous endoskeleton ✅
c) Swim bladder
d) Operculum covering gills

135. Chondrichthyes have how many chambers in the heart?
a) One
b) Two (one auricle and one ventricle) ✅
c) Three
d) Four

136. Examples of Chondrichthyes include:
a) Scoliodon, Pristis, Carcharodon, Trygon ✅
b) Exocoetus, Hippocampus, Labeo
c) Petromyzon, Myxine
d) Betta, Pterophyllum

137. Osteichthyes differ from Chondrichthyes mainly by:
a) Presence of swim bladder and bony skeleton ✅
b) Cartilaginous skeleton
c) Internal fertilization
d) Placoid scales

138. Osteichthyes have gills covered by:
a) Placoid scales
b) Operculum ✅
c) Chitinous plate
d) None of these

139. Examples of freshwater Osteichthyes include:
a) Exocoetus, Hippocampus
b) Labeo, Catla, Clarias ✅
c) Scoliodon, Pristis
d) Petromyzon, Myxine

140. Examples of marine Osteichthyes include:
a) Labeo, Catla
b) Exocoetus, Hippocampus ✅
c) Scoliodon, Trygon
d) Petromyzon, Myxine

141. Most Osteichthyes are:
a) Viviparous
b) Oviparous ✅
c) Hermaphroditic
d) Asexual

142. The term “Amphibia” refers to:
a) Animals that live only in water
b) Animals that live only on land
c) Animals with dual life—both aquatic and terrestrial ✅
d) Animals with scales

143. Amphibians breathe through:
a) Lungs only
b) Gills only
c) Skin only
d) Gills, lungs, and skin ✅

144. Heart of amphibians has how many chambers?
a) Two
b) Three (two auricles, one ventricle) ✅
c) Four
d) Five

145. Fertilization in amphibians is usually:
a) Internal
b) External ✅
c) Hermaphroditic
d) Asexual

146. Examples of amphibians include:
a) Bufo, Rana, Hyla, Salamandra, Ichthyophis ✅
b) Chelone, Crocodilus, Naja
c) Labeo, Catla, Clarias
d) Scoliodon, Pristis, Trygon

147. Class Reptilia is characterized by:
a) Moist, scaleless skin
b) Dry, cornified skin with scales ✅
c) Gills for respiration
d) Two-chambered heart

148. Heart of reptiles is usually:
a) Two-chambered
b) Three-chambered, except crocodiles with four chambers ✅
c) Four-chambered in all reptiles
d) One-chambered

149. Reptiles are:
a) Warm-blooded
b) Cold-blooded (poikilothermic) ✅
c) Amphibious only
d) Acoelomate

150. Fertilization in reptiles is:
a) Internal ✅
b) External
c) Hermaphroditic
d) Asexual

151. Examples of reptiles include:
a) Chelone, Testudo, Chameleon, Crocodilus, Naja ✅
b) Bufo, Rana, Salamandra
c) Labeo, Catla, Clarias
d) Petromyzon, Myxine

152. Aves (birds) are characterized by the presence of:
a) Scales and hair
b) Feathers ✅
c) Gills and fins
d) Mammary glands

153. The forelimbs of birds are modified into:
a) Legs
b) Claws
c) Wings ✅
d) Fins

154. Birds have which type of heart?
a) Two-chambered
b) Three-chambered
c) Four-chambered ✅
d) Five-chambered

155. Birds are:
a) Cold-blooded
b) Warm-blooded (homoiothermic) ✅
c) Poikilothermic
d) Amphibious

156. Fertilization in birds is:
a) Internal ✅
b) External
c) Hermaphroditic
d) Asexual

157. Examples of birds include:
a) Corvus, Columba, Psittacula, Struthio, Pavo, Aptenodytes, Neophron ✅
b) Bufo, Rana, Salamandra
c) Panthera, Elephas, Canis
d) Petromyzon, Myxine

158. Mammals are distinct from other animals mainly due to the presence of:
a) Scales
b) Feathers
c) Mammary glands ✅
d) Exoskeleton

159. Mammals are generally:
a) Oviparous only
b) Viviparous only
c) Mostly viviparous, with some oviparous exceptions ✅
d) Both oviparous and asexual

160. Mammals maintain constant body temperature. This means they are:
a) Poikilothermic
b) Cold-blooded
c) Homoiothermic (warm-blooded) ✅
d) Amphibious

161. Examples of mammals include:
a) Platypus, Macropus, Pteropus, Camelus, Macaca, Rattus, Canis, Felis, Elephas, Equus, Delphinus, Balaenoptera, Panthera tigris, Panthera leo ✅
b) Corvus, Columba, Psittacula
c) Scoliodon, Pristis, Trygon
d) Bufo, Rana, Hyla

162. Which feature is used as a primary criterion to classify the animal kingdom?
a) Body color
b) Type of diet
c) Level of organization ✅
d) Size of the animal

163. Porifera (sponges) are unique because they have:
a) Notochord
b) Cnidoblasts
c) Choanocytes ✅
d) Water vascular system

164. Coelenterates are mostly:
a) Terrestrial and parasitic
b) Aquatic and either fixed or free-floating ✅
c) Segmented worms
d) Birds

165. Ctenophores move using:
a) Muscular feet
b) Cilia arranged in comb plates ✅
c) Tentacles with cnidoblasts
d) Jointed appendages

166. Platyhelminths are:
a) Radially symmetrical
b) Bilaterally symmetrical ✅
c) Asymmetrical
d) Triploblastic but unsegmented

167. Parasitic Platyhelminths have:
a) Comb plates
b) Suckers and hooks ✅
c) Mantle and radula
d) Water vascular system

168. Aschelminthes (roundworms) are:
a) Coelomates
b) Acoelomates
c) Pseudocoelomates ✅
d) Radially symmetrical

169. Annelids show:
a) Pseudosegmentation
b) True segmentation (metamerism) ✅
c) No segmentation
d) Ctenophore-like combs

170. Arthropods are characterized by:
a) Soft, unsegmented body
b) Water vascular system
c) Jointed appendages and chitinous exoskeleton ✅
d) Choanocytes

171. Molluscs have:
a) Calcareous shell and soft body ✅
b) Segmented body with jointed legs
c) Water vascular system
d) Notochord

172. Echinoderms are unique due to:
a) Choanocytes
b) Water vascular system ✅
c) Comb plates for locomotion
d) Cnidoblasts

173. Hemichordates have body divided into:
a) Head, thorax, abdomen
b) Proboscis, collar, and trunk ✅
c) Foot, mantle, and visceral hump
d) Tentacles and hypostome

174. Chordates are distinguished by the presence of:
a) Radial symmetry
b) Notochord, dorsal hollow nerve cord, and paired pharyngeal gill slits ✅
c) Water vascular system
d) Comb plates

175. Cyclostomata (jawless fishes) are:
a) Vertebrates with bony skeleton
b) Ectoparasitic jawless fishes ✅
c) Cartilaginous jawed fishes
d) Tetrapods

176. Chondrichthyes are:
a) Bony fishes with swim bladder
b) Cartilaginous fishes living in the sea ✅
c) Amphibians with two pairs of limbs
d) Birds with feathers

177. Tetrapods are defined as:
a) Animals with two pairs of limbs ✅
b) Fish with fins
c) Invertebrates
d) Sponges

178. Amphibians are unique because they:
a) Live only on land
b) Live both on land and water ✅
c) Are warm-blooded
d) Have feathers

179. Reptiles have:
a) Moist, scaleless skin
b) Dry, cornified skin with scales ✅
c) Feathers
d) Hair

180. Birds (Aves) are:
a) Cold-blooded with scales
b) Warm-blooded with feathers ✅
c) Viviparous with mammary glands
d) Radially symmetrical

181. Mammals are distinct due to:
a) Feathers
b) Mammary glands and hair ✅
c) Water vascular system
d) Comb plates