Question

All chordates possess
(a) exoskeleton
(b) limbs
(c) skull
(d) axial skeletal rod of notochord

Answer 1

Answer:

Axail skeletal rod of notochord

Answer 2

All chordates possess the (d) axial skeletal rod of notochord.

• In 1880 Balfour created Phylum-Chordata. This refers to the presence of a soft, supporting rod-like structure known as the notochord which is along the  back.  
• Notochord is the flexible rod like structure of mesodermal cells, which is the main structural element of chordates.
• It is the early embryo of vertebrates, both of which play an important role in the development of the nervous system.