Economically harmful insect is:

Locusta

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Bombyx

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Apis

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Laccifer

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Solution

The correct option is A Locusta
Bombyx, Laccifer, Apis and Locusta belong to phylum Arthropoda. Bombyx, Apis, Laccifer are economically benifical.

• Bombyx or silk worm - Produces commercial silk (silk obtained from cocoon stage).
• Laccifer or lac insect – Shellac secreted by hypodermal glands of female.
• Apis or bee – Produce the honey and wax.

Locusta (grasshopper) is an economically harmful insect. It destroys different types of plants and grains.

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