NEET BIOLOGY

Detailed explanation-1: -Notochord. The chordates are named for the notochord: a flexible, rod-shaped structure that is found in the embryonic stage of all chordates and also in the adult stage of some chordate species. It is located between the digestive tube and the nerve cord, providing skeletal support through the length of the body.

Detailed explanation-2: -1: A flexible rodlike structure that forms the main support of the body in the lowest chordates, such as the lancelet; a primitive backbone.

Detailed explanation-3: -The notochord is a flexible rod that supports the animal’s back. Lancelets are one chordate species that keep the notochord throughout their life cycle.

Detailed explanation-4: -Final answer: The flexible rod-like structure present in organisms under phylum ‘Chordata’ is notochord.

Detailed explanation-5: -The notochord is a stiff but flexible rod of cells and connective tissue (from the Greek root words noto meaning back and chord meaning string) that gives the phylum its name, Chordata. In some chordates the notochord is a major support structure (Fig. 3.98).