Question

Which of the following belongs to phylum Chordata?

• A. Cuttle fish
• B. Shell fish
• C. Silver fish
• D. Dog fish

Answer 1

The correct option is D Dog fish

Cuttlefish is a common name for sepia, squid and octopuses and nautiluses. These are marine animals, belong to order sepiida, class Cephalopoda.
Shellfish is a general term used for exoskeleton-bearing aquatic invertebrates which are used as food. They include various species of molluscs, crustaceans, and echinoderms.
Silverfish (Lepisma) is an insect, commonly found in old books and old clothes. It belongs to class Insecta, phylum Arthropoda.
Dogfish is a shark, belonging to class Chondrichthyes, superclass pieces, phylum Chordata.