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Which one of the following is incorrect statement about cockroach?

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They are pest because they destroy food and contaminate it with their smelly excreta.

All species have economic importance.

Development in Periplanta Americana is paurometabolus type.

Next to last nymphal stage has wing pads.

answer is B.

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Detailed Solution

Many species of cockroaches are wild and are of no known economic importance yet.

A few species thrive in and around human habitat. They are pests because they spoil food and contaminate it with their smelly excreta.

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