- A Closed circulatory system
- B Open circulatory system
- C No circulatory system
- D Double circulation only
Correct answer: B. Open circulatory system
Explanation: Arthropods have an open circulatory system in which blood (hemolymph) flows freely in body spaces (hemocoel) rather than being confined to vessels.
Concept context
Phylum-level classification of the animal kingdom from Porifera to Chordata, based on body symmetry, coelom, and segmentation. One of the most example-heavy chapters for NEET.