Animal KingdomHard
Question
Which one of the following in birds, indicates their reptilian ancestry ?
Options
A.Scales on their hind limbs
B.Four chambered heart
C.Tour special chambers crop and gizzard in their digestive trct
D.Eggs with a calacreous ahell
Solution
Nearly a century ago T H Huxley called ″glorified reptiles″ thereby meaning that birbs have evolved from some reptilian ancestor. Both bird reptiles lay the same type of eggs, large and telolecithal. The ovum is surrounded by albumen, an egg membrane and a thick hard calcareous shell, which are all secreted by special glands located in the walls of oviduct.
Birds like mammals have completely four chambered heart with double circulation, in which there is no mixing of pure and impure bloods. Whereas the ventricle is imperfectly divided in reptiles, resulting in paetial mixing of bloods.
Birds like mammals have completely four chambered heart with double circulation, in which there is no mixing of pure and impure bloods. Whereas the ventricle is imperfectly divided in reptiles, resulting in paetial mixing of bloods.
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