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Question

Open circulatory system occurs in

A
Octopus
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B
Pheretima
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C
Periplaneta
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D
Rana
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Solution

The correct option is B Periplaneta
The open type of vascular system consisting of sinuses filled with blood is seen in the cockroach. The blood in a cockroach is colourless as it does not contain any respiratory pigment. This colourless blood is called haemolymph. The scientific name of cockroach is 'Periplaneta'. All the other options have a closed vascular system.
So, the correct answer is 'Periplanata'.

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