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In class Aves, the exoskeleton is present in which form?
ACalcareous spines
BScales only
CHairs
DFeathers
Answer & Solution
Correct answer: D. Feathers
1. Birds are completely adapted for aerial life.
2. Their exoskeleton takes the form of feathers.
3. Rule out hairs: that is the exoskeleton form of mammals.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 6 "Animal Classification", p.83_
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