(B) Silk is produced by the silkworm $(Bombyx \text{ } mori)$ during its pupal stage. The larva spins a protective covering around itself known as the

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(B) Silk is produced by the silkworm $(Bombyx \text{ } mori)$ during its pupal stage. The larva spins a protective covering around itself known as the cocoon, which is composed of long, continuous protein fibers called fibroin. Commercial silk is obtained by unwinding these cocoons.