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प्रश्न
Which among the following have an open circulatory system?
- Arthropoda
- Mollusca
- Annelida
- Coelenterata
विकल्प
(i) and (ii)
(iii) and (iv)
(i) and (iii)
(ii) and (iv)
उत्तर
(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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संबंधित प्रश्न
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- Due to which common characteristic the animals shown in the figure belong to the same phylum?
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Assertion (A): The Arthropods have an open circulatory system.
Reason (R): The cells and tissues are bathed in blood.
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Example of phylum Arthropoda is ______.
