Q.
Which of the following is not a character of chordates?
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Solution:
All the chordates possess four main characters either in the embryonic or adult stage. These characters include notochord, dorsal hollow nerve cord, pharyngeal gill slits and tail. The notochord is solid, stiff but flexible rod-like structure situated between dorsal hollow nerve cord and the alimentary canal. The nerve cord of chordates is always hollow and lies dorsal to the notochord. All the chordates have at some stage of life, a series of paired narrow openings, the gill slits on the lateral sides of the pharynx. Tail is a post anal part of the body which is reduced or absent in many adult chordates.