(A) Silk fibres are produced by the silkworm $Bombyx \text{ } mori$. These fibres consist of a core protein called fibroin, which is coated with a gum

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(A) Silk fibres are produced by the silkworm $Bombyx \text{ } mori$. These fibres consist of a core protein called fibroin, which is coated with a gummy protein known as sericin. Sericin acts as a natural adhesive that holds the silk fibres together within the cocoon structure.