At which stage in its life cycle does the silkworm yield the fiber of commercial use - (1) Larva (2) Egg (3) Pupa (4) Imago

At which stage in its life cycle does the silkworm yield the fiber of commercial use - (1) Larva (2) Egg (3) Pupa (4) Imago
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(3) Pupa Explanation: It is during the pupa or cocoon stage that the silkworm yields the fiber of commercial use. As the silkworm prepares topupate, it spins a protective cocoon. About the size and color of a cotton ball, the cocoon is constructed from one continuous strand of silk, perhaps 1.5 km long (nearly a mile). The silk cocoon serves as protection for the pupa.
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