Q.What are the modifications that are observed in birds that help them in flight?
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Start your 14-day free trial to unlock the full solution →Birds are adapted for flight by streamlined bodies, feathered wings, light pneumatic bones, powerful flight muscles, air sacs and weight-reducing features (no teeth, single ovary).
Modifications in birds that help them in flight:
- Streamlined body:
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The body is spindle-shaped (boat-shaped), reducing air resistance during flight.
- Forelimbs modified into wings:
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The forelimbs are modified into WINGS for flapping flight.
- Feathers:
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The body is covered with feathers, which provide insulation and the surface for flight; wing and tail feathers give lift and steering.
- Light, pneumatic bones:
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The bones are light, hollow and filled with air (pneumatic), reducing the body weight.
- Powerful flight muscles:
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The breast (pectoral) muscles are large and strong and are attached to a keeled sternum, providing the power to move the wings.
- Air sacs and efficient respiration:
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Birds have air sacs connected to the lungs, allowing double respiration (oxygen-rich air passes through the lungs during both inhalation and exhalation), meeting the high oxygen demand of flight; air sacs also make the body lighter.
- Weight-reducing features:
- TEETH are absent (replaced by a light horny beak); the urinary bladder is absent; in females only the LEFT ovary and oviduct are functional - all these reduce body weight. …
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