Question

Birds are characterised by the presence of

• A. Bipedal locomotion and body covered with feathers
• B. Horny jaws and four chambered heart
• C. Skin wet and devoid of glands
• D. Ribs bicephalous, homeothermic

Answer 1

The correct option is A Bipedal locomotion and body covered with feathers

Birds are characterized so as to adapt themselves for flying.
Birds are warm blooded, bipedal, egg laying vertebrate animals with feathers, forelimbs modified to wings and have hollow bones.
Thus, the correct answer is (A), Bipedal locomotion and body covered with feathers.