The silk fibre is secreted by the silkworm larva just before it enters the pupal stage. The larva spins a cocoon around itself using this silk thread. The cocoon serves as a protective casing for the pupa. The cocoon, which is the fibre of commerce, is harvested when the insect is in the pupal stage inside the cocoon.
At which stage in its life-cycle does the silkworm yield the fibre of commerce?
Asked in UPPCS Prelims 2000 · Topic: Taxonomy (Taxonomic Characters and Evidence (Morphological, Anatomical, Cytological, Molecular))
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