IGNOU LSE 9 2018 - Discuss the non-chordates yielding industrial products.

Question

Discuss the non-chordates yielding industrial products.

23 Jan 2018

Answer :

Word Count : 601

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

Silk
Shellac
Beeswax
ShelIs
Pearls
Corals
Sponges
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 larval stage of the silk moth Bombyx mori The worm feeds on mulbeny leaves (Morus aha).

2 Lac

Lac and the related shellac are familiar substances used for making french polish and floor polish, gramophone records, bangles, printing ink, electrical insulators and sealing wax. It is also employed for a host of other purposes. However, now-a-days substitute synthetic substances are being used for some of the above items.

3 Beeswax

Beeswax is the material that makes the beehive. This material is a secretion of the worker bees that is poured out from the wax glands that open on the underside of the abdomen forming thin delicate scales. The worker bee removes these wax flakes with its legs, picks them up into mouth, manipulates by the mandibles and builds the combs of the hive. Wild bees especially Apis dorsata is the

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