Osteichthyes MCQs

  • What is the primary characteristic of Osteichthyes?
    • A) They have a cartilaginous skeleton.
    • B) They have a bony skeleton.
    • C) They are warm-blooded.
    • D) They possess gills only.
      Answer: B) They have a bony skeleton.
  • Which of the following is a subclass of Osteichthyes?
    • A) Elasmobranchii
    • B) Actinopterygii
    • C) Agnatha
    • D) Chondrichthyes
      Answer: B) Actinopterygii
  • What type of fish is primarily found in the class Osteichthyes?
    • A) Sharks
    • B) Ray-finned fish
    • C) Lampreys
    • D) Sturgeons
      Answer: B) Ray-finned fish
  • Which of the following is NOT a characteristic of Osteichthyes?
    • A) Swim bladder
    • B) Bony skeleton
    • C) Gills covered by operculum
    • D) Lack of fins
      Answer: D) Lack of fins
  • What is the function of the swim bladder in Osteichthyes?
    • A) Digestion
    • B) Buoyancy control
    • C) Respiration
    • D) Reproduction
      Answer: B) Buoyancy control
  • Which of the following fish belongs to the Osteichthyes class?
    • A) Hammerhead shark
    • B) Catfish
    • C) Manta ray
    • D) Nurse shark
      Answer: B) Catfish
  • What structure do Osteichthyes use to breathe?
    • A) Lungs
    • B) Gills
    • C) Skin
    • D) Swim bladder
      Answer: B) Gills
  • Which of the following adaptations is common in Osteichthyes?
    • A) Cartilage skeleton
    • B) Operculum
    • C) Lack of scales
    • D) Warm-bloodedness
      Answer: B) Operculum
  • What type of reproduction do most Osteichthyes exhibit?
    • A) Oviparous
    • B) Viviparous
    • C) Ovoviviparous
    • D) All of the above
      Answer: D) All of the above
  • Which of the following is a method Osteichthyes use to find food?
    • A) Hunting in packs
    • B) Filter feeding
    • C) Grazing on algae
    • D) All of the above
      Answer: D) All of the above
  • Which of the following is a feature of bony fish?
    • A) Reduced size of the dorsal fin
    • B) Presence of a swim bladder
    • C) Absence of scales
    • D) Cartilaginous jaws
      Answer: B) Presence of a swim bladder
  • What type of scales do many Osteichthyes have?
    • A) Placoid scales
    • B) Ganoid scales
    • C) Cycloid or ctenoid scales
    • D) All of the above
      Answer: C) Cycloid or ctenoid scales
  • Which of the following is a significant advantage of a bony skeleton?
    • A) Increased flexibility
    • B) Enhanced buoyancy
    • C) Greater strength
    • D) Improved maneuverability
      Answer: C) Greater strength
  • What is the main purpose of the lateral line system in Osteichthyes?
    • A) Navigation
    • B) Detecting vibrations and movement in water
    • C) Breathing
    • D) Feeding
      Answer: B) Detecting vibrations and movement in water
  • Which of the following is a primary diet type for many Osteichthyes?
    • A) Herbivorous
    • B) Carnivorous
    • C) Omnivorous
    • D) All of the above
      Answer: D) All of the above
  • What is the typical body shape of most Osteichthyes?
    • A) Flat
    • B) Cylindrical or streamlined
    • C) Boxy
    • D) Irregular
      Answer: B) Cylindrical or streamlined
  • Which of the following is NOT a feature of the Actinopterygii subclass?
    • A) Ray-finned
    • B) Lobe-finned
    • C) Cartilaginous skeleton
    • D) Operculum
      Answer: C) Cartilaginous skeleton
  • What organ helps Osteichthyes with their buoyancy?
    • A) Gills
    • B) Liver
    • C) Swim bladder
    • D) Heart
      Answer: C) Swim bladder
  • Which of the following adaptations helps Osteichthyes with swimming efficiency?
    • A) Dorsal fins
    • B) Pectoral fins
    • C) Tail fins
    • D) All of the above
      Answer: D) All of the above
  • Which group of Osteichthyes is known for having lobed fins?
    • A) Actinopterygii
    • B) Elasmobranchii
    • C) Sarcopterygii
    • D) Agnatha
      Answer: C) Sarcopterygii
  • What type of scales are found in the fish of the subclass Actinopterygii?
    • A) Placoid scales
    • B) Ganoid scales
    • C) Cycloid scales
    • D) Both B and C
      Answer: D) Both B and C
  • Which of the following is a common example of a bony fish?
    • A) Tuna
    • B) Shark
    • C) Skate
    • D) Lamprey
      Answer: A) Tuna
  • Which of the following adaptations allows Osteichthyes to live in various aquatic environments?
    • A) Flexible bodies
    • B) Ectothermic metabolism
    • C) Variety of feeding strategies
    • D) All of the above
      Answer: D) All of the above
  • How do Osteichthyes usually reproduce?
    • A) External fertilization
    • B) Internal fertilization
    • C) Both external and internal fertilization
    • D) Asexual reproduction
      Answer: C) Both external and internal fertilization
  • What helps Osteichthyes to detect food in murky waters?
    • A) Their eyes
    • B) Their gills
    • C) Their lateral line system
    • D) Their nostrils
      Answer: C) Their lateral line system
  • Which of the following features helps to protect the gills of Osteichthyes?
    • A) Scales
    • B) Operculum
    • C) Fins
    • D) Swim bladder
      Answer: B) Operculum
  • What kind of circulatory system do Osteichthyes possess?
    • A) Open circulatory system
    • B) Closed circulatory system
    • C) None
    • D) Both A and B
      Answer: B) Closed circulatory system
  • Which of the following is a major ecological role of Osteichthyes?
    • A) They are primary producers.
    • B) They serve as prey for larger animals.
    • C) They are decomposers.
    • D) They have no ecological role.
      Answer: B) They serve as prey for larger animals.
  • What is the primary sensory organ used by Osteichthyes to detect chemical changes in the water?
    • A) Eyes
    • B) Nostrils
    • C) Lateral line system
    • D) Ears
      Answer: B) Nostrils
  • What is a common threat to Osteichthyes populations worldwide?
    • A) Overfishing
    • B) Pollution
    • C) Habitat loss
    • D) All of the above
      Answer: D) All of the above

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