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A : Sericin is a gummy substance which i...

A : Sericin is a gummy substance which is usually retained in case of silk till the yarn or fabric stage
R : Sericin gives protection during processing

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**Step-by-Step Solution:** 1. **Understanding the Assertion (A)**: - Sericin is identified as a gummy substance that is retained during the silk production process until the yarn or fabric stage. This means that sericin remains present in the silk fibers throughout the initial stages of silk processing. 2. **Understanding the Reason (R)**: - The reason given is that sericin provides protection during the processing of silk. This implies that sericin plays a crucial role in safeguarding the silk fibers while they are being transformed into yarn or fabric. 3. **Analyzing the Relationship**: - Both the assertion and the reason are true. Sericin is indeed a protein found in the cocoon of the silkworm and is retained until the yarn stage. Additionally, it serves a protective function during the processing of silk. 4. **Conclusion**: - Since both the assertion (A) and the reason (R) are true and the reason correctly explains the assertion, we can conclude that the statement is valid. **Final Answer**: Both assertion (A) and reason (R) are true, and R is the correct explanation of A. ---
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