A sticky fluid secreted by the salivary glands when caterpillar enters the pupal stage
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The sticky fluid secreted by larva is protein called fibroin
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Explanation:
A sticky fluid secreted by the salivary glands when caterpillar enters the pupal stage is known as fibrion.
This secreted fluid, which is known as fibrion is highly essential and is the most necessary ingredient for the production of fibre, which produces silk, a material of huge value in textile market.
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