Discuss the non-chordates yielding industrial products.

The following industrial products are obtained from some non-chordates:

1. Silk
2. Shellac
3. Beeswax
4. ShelIs
5. Pearls
6. Corals
7. Sponges
8. Dyes and pigments

1 Silk

Though various species of insects produce silk, which is'a secretion of their salivary glands, silk of cothmercial quality is produced only by a very limited number of species. The silk produced by the mulberrysilk worm ofthe species Bombyx mori is the most valued of these. This species belongsto the family Bombycidae. This silk is one of the most valuable and widely used products. It is the secretion of the paired salivary glands of the full grown last ____ _________ _________ ____ ______.
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