Which of the following is not a characteristic of chordates?
- Presence of post anal part (tail)
- Presence of notochord
- Central nervous system is dorsal
- Absence of gills
Answer
(4) Absence of gills
Solution
Fundamental characteristics of chordates include the presence of a notochord, a dorsal hollow central nervous system, paired pharyngeal gill slits, and a post-anal tail. Hence, 'Absence of gills' is not a characteristic of chordates.
Answer: (4)