Which among the following have an open circulatory system?
i) Arthropoda
ii) Mollusca
iii) Annelida
iv) Coelenterata
Grade :10

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i) and ii)

iii) and iv)

i) and iii)

ii) and iv)

answer is A.

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Detailed Solution

Concept: i) Arthropods have an open circulatory system, in which the blood (hemolymph) surrounds the organs in a chamber called a hemocoel before returning to the heart through openings known as ostia.
ii) Molluscs typically have open circulatory systems, however certain species also have closed circulatory systems.
iii) The blood in annelids is constrained to blood vessels, much like it is in humans since annelids have a closed circulatory system.
iv) Coelenterates don't have a circulatory system since it is unnecessary because all of the cells are in close touch with one another and exchange takes place through them.
Hence, option 1 is the correct answer.

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