Q4 of 45 Page 17

What is the role of feathers?

In aves, besides pneumatic bones, feathers are also helpful in making the body weigh lighter and help in flight.


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2

What is the importance of pneumatic bones and air sacs in Aves?

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What is metagenesis? Mention an example which exhibits this phenomenon.

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Which group of chordates possess sucking and circular mouth without jaws?

 6

Give one example each for an animal possessing placoid scales and that with cycloid scales.