| (a) Hollow bones in birds helps them to fly. |
| (b) Streamlined body of birds helps them to walk on ground. |
| (c) Perching birds have three toes in front and one at the back. |
A) (a) and (b) only
B) (b) and (c) only
C) (a) and (c) only
D) (a), (b) and (c)
Correct Answer: C
Solution :
Birds have thin, hollow bones to lighten their weight that make flight easier. Perching birds like sparrows, crows, etc. have feet that consist of four long, thin toes. Three toes face forward and one faces backwards. This type of structure enables them to grip onto thin branches, twigs and flimsy grass stems. Streamlined body of birds help them to fly.
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