NEET 2006 Biology question

Which one of the following has an open circulatory system ?

(1)Pheretima
(2)PeriplanetaCorrect
(3)Hirudinaria
(4)Octopus

Answer: (2)

Solution

In an open circulatory system the blood is pumped into open spaces (haemocoel) and bathes the tissues directly. Arthropods such as the cockroach (Periplaneta) have an open system.

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Question ID VK-089718