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Which of the following is incorrect for the class Aves of the animal kingdom?1. They lay eggs2. Their forelimbs are modified into wings3. They have a two - chambered heart4. Their body is covered with feathers

Answer» Correct Answer - Option 3 : They have a two - chambered heart

The correct answer is They have a two-chambered heart.

  • Aves is the class of a Phylum Chordata of the Animal Kingdom which comprises of the birds.
  • The members of the Aves are characterized by being feathered, warm-blooded, and bipedal and the forelimb is modified into wings that help in the flight mechanism. 
    • Example- Archaeopteryx, which lived approximately 147 million years ago, is recognized as the oldest known bird.

  • Characteristics-
    • Birds are bipedal feathered and warm-blooded.
    • Hind-limbs are modified for perching, walking, or swimming
    • Lower and upper and jaws are modified into a beak
    • Birds are oviparous and exhibit sexual dimorphism
    • They have the 4-chambered heart with complete separation of oxygenated and de-oxygenated blood
    • Birds show courtship, nest building, parental care, and migration.


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