Question

Silk fibre is made up of a _______________​

Answer 1

Answer:

The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons.

Explanation:

Answer 2

Answer:

Most spiders make a natural fibre of their own that is also called silk. Silk that is made by the silk worm is made up of two main proteins, sericin and fibroin . Fibroin is the structural center of the silk and gives it its strength. It is made up of amino acids, which make the fibers strong and hard to break.