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Silk mainly consists of :-...

Silk mainly consists of :-

A

Keratin

B

Fibroin

C

Collagen

D

Elastin

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Silk**: Silk is a natural fiber produced by silkworms, primarily from the species Bombyx mori. It is known for its softness, luster, and strength. 2. **Identifying the Components of Silk**: Silk is primarily composed of proteins. The two main proteins found in silk are fibrin and sericin. 3. **Proportions of Proteins**: In silk, fibrin constitutes about 70-80% of the total protein content, while sericin makes up about 20-30%. 4. **Analyzing the Options**: - **Keratin**: This is a protein found in hair, nails, and skin, but not in silk. - **Fibrin**: This is a protein that is indeed a major component of silk. - **Collagen**: This is a structural protein found in connective tissues, not in silk. - **Elastin**: This protein provides elasticity to tissues, but it is not present in silk. 5. **Conclusion**: Based on the analysis, the main protein that silk consists of is fibrin. **Final Answer**: Silk mainly consists of **fibrin**. ---
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