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Which one of the following has an open circulatory system ? [2006]

  • a)
    Periplaneta

  • b)
    Hirudinaria

  • c)
    Octopus

  • d)
    Pheretima

Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Which one of the following has an open circulatory system ? [2006]a)Pe...
Periplaneta (P. americana, the Indian Cockroach) is an insect & insects do not have closed blood circulation. Their blood (called haemolymph) even does not serve for respiration. They do not possess blood vessels in this circulatory system and hence it is an open system. Hirudinaria is a pure exception for having a closed circulatory system, even though it belongs to the phylum Annelida, which generally has an open circulatory system. 
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Most Upvoted Answer
Which one of the following has an open circulatory system ? [2006]a)Pe...
Blood vascular system of cockroach is an open type. Blood vessels are poorly developed and open into space (haemocoel) .In this the blood is pumped by the heart and open in the blood cavity . Organs floating in the blood get nutrition directly.
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Which one of the following has an open circulatory system ? [2006]a)Pe...
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Which one of the following has an open circulatory system ? [2006]a)Periplanetab)Hirudinariac)Octopusd)PheretimaCorrect answer is option 'A'. Can you explain this answer?
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