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Which one of the following statements about the blood vascular system of cockroach is true?

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The blood vascular system is of closed type

The haemolymph contains haemocyanin

Blood vessels open into the haemocoel

Blood flows posteriorly in the heart

answer is C.

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Detailed Solution

Blood vessels open into the haemocoel. The blood vascular system is of open type. The haemolymph lacks a respiratory pigment. Blood flows anteriorly in the heart.

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