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Q.

Read the following statements about Aves

I) Endoskeleton is fully ossified.

II) The digestive tract has additional chambers, the crop and the gizzard.

III) All bones are pneumatic.

IV) Skin is dry without glands.

In the above how many are true ?      

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a

Only two

b

Only three

c

Only one

d

All four

answer is A.

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Detailed Solution

In birds, the endoskeleton is fully ossified and the digestive tract has additional chambers, the crop and the gizzard.  

In birds only long bones are pneumatic.  

The skin is dry without glands except uropygeal gland (preen gland).

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Read the following statements about Aves I) Endoskeleton is fully ossified. II) The digestive tract has additional chambers, the crop and the gizzard. III) All bones are pneumatic. IV) Skin is dry without glands. In the above how many are true ?