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Question

Percentage composition of fibroin and sericin in silk is
  1. 50:40
  2. 80:20
  3. 30:70
  4. 40:60

A
50:40
B
30:70
C
40:60
D
80:20
Solution
Verified by Toppr

The chemical composition of silk fibre by weight are, in general, 75-83% of silk fibroin, 17-25% of sericin, 1.5% of wax and about 1-2% of others, such as hydrocarbon.
Fibroin is the core silk protein and sericin is the surface gum like compound. Hence, option B is correct answer.

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