| (i) The forelimbs are modified into wings and the hindlimbs generally have scales and are modified for walking, swimming or clasping the tree branches. |
| (ii) Heart is completely four-chambered. |
| (iii) They are warm- blooded (homoiothermous) animals i.e., they are able to maintain a constant body temperature. |
| (iv) They are oviparous and development is direct. |
A) Both (i) and (iii)
B) Both (i) and (iv)
C) (i), (ii) and (iii)
D) All of these
Correct Answer: B
Solution :
[b] Most birds have only one ovary and one oviduct. In early stages of embryonic development, each female bird has two ovaries, only the left one develops into functional organ.
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