Question

Adaptations to aerial mode in birds

Answer 1

1.the forelimbs of all the birds are modified into wings which is useful for them to fly.
2.the bones of birds are hallow which decrises the weight hence it's help to fly.
3.there shape is like streamed and spindle.
4.this reduces the resistance while flying.
5.the exoskeleton is of feathers which make them lighter.

Answer 2

Answer:

• In birds, the forelimbs are modified into wings for flying. Hind limbs are adapted for perching, walking and running.
• Bones are hollow with air cavities which keeps the body light.
• Body is streamlined to reduce resistance of air during flight.
• Exoskeleton is made up of feathers which are crucial for flight.
• Lungs have air sacs which helps to maintain buoyancy during flight.
• Cerebellum is well developed for equilibrium.
• Urinary bladder is absent.
• Females have only one ovary and oviduct (left) to reduce body weight.
• Mouth is without teeth.