Silk fiber chemically is

Silk fiber chemically is : 

(1) Carbohydrate 

(2) Fat 

(3) Protein 

(4) Cellulose 

Answer: (3) Silk is a natural protein fiber, some forms that can be woven into textiles. The protein fiber of silk is composed mainly of fibroin and produced by certain insect larvae to form cocoons. The best-known type of silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyxmorireared in captivity (sericulture). The shimmering appearance of silk is due to the triangular prism-like structure of the silk fiber, which allows silk cloth to refract incoming light at different angles, thus producing different colors. 

Silk fiber chemically is :   (1) Carbohydrate   (2) Fat   (3) Protein   (4) Cellulose

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