Chitin exoskeleton is found in:

Cockroach

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Ascaris

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Nematoda

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None of the above

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Solution

The correct option is A Cockroach
Arthropods including cockroaches are covered with a tough, resilient integument or exoskeleton of chitin. This is made of three layers. Normally the exoskeleton will have thickened areas in which the chitin is reinforced or stiffened by materials such as minerals or hardened proteins. Therefore, the correct answer is option A.

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