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Periplaneta americana is also known as American cockroach. Which of the following information about it is incorrect?
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The correct answer is:
Type of circulatory system = Closed type
Circulatory system in cockroach: It is open type. Blood vessels are poorly developed, and they open into haemocoel or open spaces. Body fluid present in haemocoel is also known as haemolymph. Blood is colourless as there is no respiratory pigment.
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