Question

Based on the common features like presence of notochord and dorsal hollow neural system, animals like fishes, amphibians, reptiles, birds along with mammals are included in which Phylum?

• A. Mammalia
• B. Chordata
• C. Primata
• D. Insecta

Answer 1

Answer: (B)

Chordata

• The members of Phylum Chordata are the most intelligent and highly evolved animals.
• They are characterized by the presence of a notochord and dorsal hollow nerve cord along with other characters.
• The notochord is a solid, rod-like structure that lies below the nerve cord and above the alimentary canal.
• In most chordates, it is replaced by the backbone or vertebral column in adults.
• The dorsal nerve cord is a hollow fluid-like canal that runs from one end of the body to the other.
• It plays a role in the integration and coordination of body activities.

So, the correct answer is option B.