In molluscs, closed circulatory system is found in the class(es):I. bivalviaII. gastropodaIII. cephalopoda
Correct answer: B. III only
- A. I only
- B. III only
- C. I and II
- D. II and III
Explanation
In the phylum Mollusca, the class Cephalopoda, which includes organisms such as octopuses and squids, is unique for having a closed circulatory system. This means their blood is contained within vessels, which allows for more efficient oxygen and nutrient transport.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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