Question

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. A & C only
• B. A. B & D only
• C. B. D & E only
• D. B, C & D only

Answer 1

Answer: (C)

B. D & E only

Answer 2

- Statement A is correct: Non-chordates like invertebrates often have a pharynx perforated by gill slits.

- Statement B is correct: Non-chordates lack a notochord.

- Statement C is correct: The central nervous system in non-chordates is dorsal.

- Statement D is correct: In non-chordates, if a heart is present, it is usually dorsal.

- Statement E is incorrect: Many non-chordates possess a post-anal tail.

Thus, the correct answer is: B, D, and E only.