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shiv Prakash from The millennium school hmel township, Bhatinda
Subject :IGK    Class : Class 7

Feathers of birds are made up of an insoluble protein called _______.

A Calamus
B Lignin
C Keratin
D Biotin


How keratin.it is found in animals not in birds

Ans 1:

shiv Prakash from The millennium school hmel township, Bhatinda
Class : Class 7
Answer is d

Ans 2:

Aman Sumesh from Apeejay School, Kharghar
Class : Class 8
Keratin is found in both animals and birds. So the answer is Keratin. Biotin is also an insoluble pigment found in bird's feathers, but it is not a protein.

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