Question:
Closed type of circulatory system is found in the members of:
Closed type of circulatory system is found in the members of:
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Closed system = blood confined to vessels (higher efficiency).
Updated On: Jun 19, 2026
- Arthropoda, Mollusca and Echinodermata
- Urochordata and Annelida
- Annelida, Cephalopoda, Cephalochordata and Vertebrata
- Urochordata and Cephalochordata
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The Correct Option is C
Solution and Explanation
Step 1: Understand circulatory system types.
In animals, circulatory systems are of two types: open and closed.
Step 2: Closed circulatory system definition.
In a closed circulatory system, blood flows within blood vessels and does not directly bathe tissues.
Step 3: Identify correct groups.
Annelids, cephalopods, cephalochordates, and vertebrates exhibit a closed circulatory system.
Step 4: Analyze incorrect options.
Arthropods and most molluscs have open circulation; echinoderms lack a true circulatory system.
Step 5: Comparative biology.
Cephalopods are an exception among molluscs as they have a closed system.
Step 6: Conclusion.
Thus, option (3) is correct.
In animals, circulatory systems are of two types: open and closed.
Step 2: Closed circulatory system definition.
In a closed circulatory system, blood flows within blood vessels and does not directly bathe tissues.
Step 3: Identify correct groups.
Annelids, cephalopods, cephalochordates, and vertebrates exhibit a closed circulatory system.
Step 4: Analyze incorrect options.
Arthropods and most molluscs have open circulation; echinoderms lack a true circulatory system.
Step 5: Comparative biology.
Cephalopods are an exception among molluscs as they have a closed system.
Step 6: Conclusion.
Thus, option (3) is correct.
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