Question

Chordates are distinguished from non chordates by the presence of
A. Brain
B. Dorsal tubular hollow nerve cord
C. Ventral nerve cord
D. Dorsal nerve cord

Answer 1

Chordata is a phylum that incorporates life forms like warm-blooded creatures, fish, winged animals, reptiles, and creatures of land and water (all vertebrates); ocean spurts (tunicates); and lancelets (cephalochordates). They go through four phases of advancement. Chordates are additionally reciprocally symmetric and have a coelom, metameric division, and circulatory framework.

Complete answer:
A chordate is a creature of the phylum Chordata. During some time of their life cycle, chordates have a notochord, a dorsal nerve cord, pharyngeal cuts, and a post-butt-centric tail: these four anatomical highlights characterize this phylum. The chordates are named for the notochord: an adaptable, pole molded structure that is found in the undeveloped phase, all things considered, and in the grown-up phase of some chordate species.
The dorsal hollow nerve cord gets from an ectoderm that folds into an empty cylinder during improvement. In chordates, it is found dorsally (at the highest point of the creature) to the notochord. Rather than the chordates, other creature phyla are portrayed by strong nerve strings that are found either vertically or horizontally. The nerve string found in most chordate undeveloped organisms forms into the cerebrum and spinal string, which contain the focal sensory system.

Hence, the correct answer is option (B).

Additional information:
A brain is the most intricate organ in a vertebrate's body that is situated in the head near the tangible organs, for example, eyes. It fills in as the primary point of the sensory system in all vertebrate and invertebrate animals.
The ventral nerve cord (VNC) is a significant structure of the invertebrate focal sensory system. It is what might be compared to the vertebrate spinal rope.
The notochord offers skeletal help, gives the phylum its name, and forms into the vertebral segment invertebrates. The dorsal nerve cord forms into the focal sensory system: the mind and spine.

Note:
Chordates have focal dorsal hollow nerve cord, which is missing in non-chordates. Chordates have a notochord, an empty dorsal nerve line, pharyngeal cuts, an endostyle, and a post-butt-centric tail for probably sometime of their life cycles. The dorsal empty nerve line is essential for the chordate focal sensory system. Dorsal empty rounded nerve rope, pharyngeal cuts, endostyle/thyroid organ, are the inferred qualities that recognize them from invertebrate chordates.