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Question
A list of animals is given below. Identify the animals with open circulatory system and choose the correct answer.
(A) Squid (B) Cockroach
(C) Earthworm (D) Prawn
(E) Silverfish (F) Snail
A list of animals is given below. Identify the animals with open circulatory system and choose the correct answer.
(A) Squid (B) Cockroach
(C) Earthworm (D) Prawn
(E) Silverfish (F) Snail
(C) Earthworm (D) Prawn
(E) Silverfish (F) Snail
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Solution
The correct option is D B, D, E, F
In an open circulatory system, blood is pumped from the heart through blood vessels but then it leaves the blood vessels and enters body cavities, where the organs are bathed in blood, or sinuses (spaces) within the organs whereas in closed system, blood remains within blood vessels, pressure is high, and blood is therefore pumped faster. Arthropods and most of the molluscs have an open circulatory system. Cockroach, Prawn and Silverfish are all arthropods and hence have an open circulatory system. The snail is a mollusc with the open circulatory system. Earthworm is an annelid and has closed circulatory system. Squid is a cephalopod mollusc having a closed circulatory system. Thus, the correct answer is option D.
In an open circulatory system, blood is pumped from the heart through blood vessels but then it leaves the blood vessels and enters body cavities, where the organs are bathed in blood, or sinuses (spaces) within the organs whereas in closed system, blood remains within blood vessels, pressure is high, and blood is therefore pumped faster. Arthropods and most of the molluscs have an open circulatory system. Cockroach, Prawn and Silverfish are all arthropods and hence have an open circulatory system. The snail is a mollusc with the open circulatory system. Earthworm is an annelid and has closed circulatory system. Squid is a cephalopod mollusc having a closed circulatory system.
Thus, the correct answer is option D.
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