Class 11 NEET Biology Animal Kingdom Questions Part 2

(a) : Nereis, scorpion, cockroach and silver fish are all invertebrates and thus possess dorsal heart. Nereis is a marine animal while other animals mentioned in the question are terrestrial. Nereis belongs to Phylum Annelida while rest of the animals belong to Phylum Arthropoda. Jointed appendages are present in scorpion, cockroach and silver fish.