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:
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.
Ans 2:
Class : Class 7
Answer is d