Adaptations for Aquatic and Aerial Movement · NCERT Biology

The 'synsacrum' in birds, formed by the fusion of several vertebrae and the pelvic girdle, provides:

  1. Neck flexibility
  2. A rigid frame to withstand landing impact
  3. Better digestion
  4. Increased lung capacity for sustained flight breathing
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Correct answer: A rigid frame to withstand landing impact

The synsacrum provides a strong, rigid central frame. This rigidity is essential for supporting the body weight during flight and absorbing the mechanical shock of landing.

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