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Question
Which among the following have an open circulatory system?
- Arthropoda
- Mollusca
- Annelida
- Coelenterata
Options
(i) and (ii)
(iii) and (iv)
(i) and (iii)
(ii) and (iv)
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Solution
(i) and (ii)
Explanation -
In the open circulatory system, blood flows in open spaces and bathes the cells directly. It does not flow in well-defined blood vessels. Examples-Arthropoda and Mollusca (except cuttlefish).
In the closed circulatory system, blood circulates inside the blood vessels without ever coming in direct contact with the body cells. Examples- Annelida and Chordata.
Blood is not present in the phyla Porifera, Coelenterata, Ctenophora, Platyhelminthes, and Aschelminthes.
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