Question

The primary function of feathers in birds is to
A. Provide a rigid surface for flying
B. Form a waterproof covering over the body
C. Help in sexual attraction
D. Prevent the loss of heat from the body for thermoregulation

Answer 1

Hint: Birds are a member of the class Aves. Aves is a subclass of the superclass Tetrapoda that consists of organisms with two pairs of limbs. They belong to the phylum Chordata or Vertebrates that consists of organisms with a notochord that develops into the vertebral column.

Complete answer: Aves are commonly known as birds. Their forelimbs are modified into wings that help them in flying. The complete body of birds is covered with feathers. Feathers serve various purposes. The foremost and the most important function of a feather is that they help in insulation. It means that they prevent the loss of heat from the body. Therefore, feathers help in thermoregulation or control the temperature of the organism’s body. The other functions of feathers are that they help in making the bodies of birds streamlined. Streamlined bodies cut easily through the air and aid birds in flying. Feathers also make the body of birds air-light, which makes it easier for them to fly in the air.
Hence, the correct answer is option D.

Note: Birds have various flight adaptations that assist them to fly. The mouth of the birds modified to form a beak without any teeth. It helps in picking up food easily. Birds have hollow bones known as pneumatic bones, which make them air light. Their vertebrae are also fused together.