The following are the statements about non-chordates: A. Pharynx is perforated by gill slits. B. Notochord is absent. C. Central nervous system is dorsal. D. Heart is dorsal if present. E. Post anal tail is absent. Choose the most appropriate answer from the options given below:

A B, D and E only

B B, C and D only

C A and C only

D A, B and D only

The answer is A.

Solution

A. Pharynx perforated by gill slits is a chordate feature; gill slits are absent in non-chordates – incorrect. B. Notochord is absent in non-chordates – correct. C. The central nervous system is ventral (not dorsal) in non-chordates – incorrect. D. Heart is dorsal, if present, in non-chordates – correct. E. Post-anal tail is absent in non-chordates – correct. So B, D and E only.

Concept Correct features distinguishing non-chordates from chordates

Animal Kingdom in past papers

123 questions from this chapter have appeared across 27 exam years.

The following are the statements about non-chordates: A. Pharynx is perforated by gill slits. B. Notochord is absent. C. Central nervous system is dorsal. D. Heart is dorsal if present. E. Post anal tail is absent. Choose the most appropriate answer from the options given below:

Solution

Animal Kingdom in past papers

Practice

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