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Animal Kingdom

Classes of Chordates Practice Questions

19 free Classes of Chordates practice questions for the NCERT Biology. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.

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Question 1 of 19 Medium

Which class of chordates is characterized by the presence of gills throughout life?

  1. A Amphibia
  2. B Pisces
  3. C Reptilia
  4. D Aves

Correct answer: Pisces

Pisces (fishes) respire through gills throughout their life. Other classes may use lungs or show transitional respiration.

Question 2 of 19 Medium

Which class shows both aquatic and terrestrial modes of life?

  1. A Pisces
  2. B Reptilia
  3. C Aves
  4. D Amphibia

Correct answer: Amphibia

Amphibians live both in water and on land. They typically have aquatic larvae and terrestrial adults.

Question 3 of 19 Medium

Which class of chordates is the first to exhibit amniotic eggs?

  1. A Pisces
  2. B Amphibia
  3. C Reptilia
  4. D Aves

Correct answer: Reptilia

Reptiles are the first amniotes, having eggs with protective membranes. This adaptation allows reproduction away from water.

Question 4 of 19 Medium

Which class is characterized by the presence of feathers?

  1. A Reptilia
  2. B Mammalia
  3. C Amphibia
  4. D Aves

Correct answer: Aves

Aves (birds) are uniquely identified by feathers. These structures aid in flight and insulation.

Question 5 of 19 Medium

Which class of chordates possesses mammary glands?

  1. A Reptilia
  2. B Aves
  3. C Mammalia
  4. D Amphibia

Correct answer: Mammalia

Mammalia have mammary glands that produce milk to nourish their young. This is a defining feature of mammals.

Question 6 of 19 Medium

Which class of chordates is cold-blooded and has dry, scaly skin?

  1. A Amphibia
  2. B Pisces
  3. C Reptilia
  4. D Aves

Correct answer: Reptilia

Reptiles are ectothermic and have dry, keratinized scales. This helps reduce water loss.

Question 7 of 19 Medium

Which class has a four-chambered heart in all members?

  1. A Pisces
  2. B Amphibia
  3. C Reptilia
  4. D Aves

Correct answer: Aves

Aves have a completely four-chambered heart, ensuring efficient separation of oxygenated and deoxygenated blood.

Question 8 of 19 Medium

Which chordate class typically has a three-chambered heart?

  1. A Pisces
  2. B Aves
  3. C Mammalia
  4. D Amphibia

Correct answer: Amphibia

Amphibians have a three-chambered heart with two atria and one ventricle. This results in partial mixing of blood.

Question 9 of 19 Medium

Which class of chordates shows the presence of a swim bladder for buoyancy?

  1. A Pisces
  2. B Amphibia
  3. C Reptilia
  4. D Aves

Correct answer: Pisces

Many bony fishes possess a swim bladder. It helps them maintain buoyancy in water.

Question 10 of 19 Medium

Which class has a body covered with hair or fur?

  1. A Aves
  2. B Reptilia
  3. C Mammalia
  4. D Amphibia

Correct answer: Mammalia

Mammals have hair or fur, which provides insulation and protection. It is a unique feature of this class.

Question 11 of 19 Medium

Which class of chordates undergoes metamorphosis from larval to adult stage?

  1. A Amphibia
  2. B Pisces
  3. C Reptilia
  4. D Mammalia

Correct answer: Amphibia

Amphibians like frogs undergo metamorphosis from aquatic larvae to terrestrial adults. This involves major physiological changes.

Question 12 of 19 Medium

Which class of chordates has lungs as the main respiratory organs in adults but gills in larvae?

  1. A Amphibia
  2. B Pisces
  3. C Reptilia
  4. D Aves

Correct answer: Amphibia

Amphibians have gills during larval stages and develop lungs as adults. This reflects their dual life.

Question 13 of 19 Medium

Which class of chordates is primarily adapted for flight?

  1. A Aves
  2. B Reptilia
  3. C Mammalia
  4. D Pisces

Correct answer: Aves

Aves are adapted for flight with features like wings, hollow bones, and feathers. These adaptations reduce weight and increase efficiency.

Question 14 of 19 Medium

Which class of chordates has internal fertilization and lays shelled eggs on land?

  1. A Pisces
  2. B Amphibia
  3. C Reptilia
  4. D Mammalia

Correct answer: Reptilia

Reptiles have internal fertilization and lay amniotic eggs with protective shells. This enables reproduction independent of water.

Question 15 of 19 Medium

Which class of chordates is endothermic and maintains a constant body temperature?

  1. A Pisces
  2. B Amphibia
  3. C Reptilia
  4. D Mammalia

Correct answer: Mammalia

Mammals are endothermic and regulate their body temperature internally. This allows them to survive in diverse environments.

Question 16 of 19 Medium

Which class of chordates has a lateral line system for sensing vibrations?

  1. A Pisces
  2. B Amphibia
  3. C Reptilia
  4. D Aves

Correct answer: Pisces

Pisces possess a lateral line system that detects vibrations and movements in water. It is important for navigation and prey detection.

Question 17 of 19 Medium

Which class has a beak instead of teeth?

  1. A Aves
  2. B Reptilia
  3. C Mammalia
  4. D Amphibia

Correct answer: Aves

Aves have beaks instead of teeth. The shape of the beak is adapted to their feeding habits.

Question 18 of 19 Medium

Which class of chordates shows external fertilization in most species?

  1. A Pisces
  2. B Reptilia
  3. C Aves
  4. D Mammalia

Correct answer: Pisces

Most fishes exhibit external fertilization. Eggs and sperm are released into water for fertilization.

Question 19 of 19 Medium

Which class of chordates includes animals like whales and bats?

  1. A Reptilia
  2. B Aves
  3. C Mammalia
  4. D Amphibia

Correct answer: Mammalia

Whales and bats are mammals despite their different habitats. They share features like mammary glands and warm-bloodedness.

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