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

The Correct Option is C

Evaluating Statements about Non-Chordates:

• Statement A: Incorrect – Pharyngeal gill slits are found in chordates, not all non-chordates.
• Statement B: Correct – Non-chordates lack a notochord.
• Statement C: Incorrect – In non-chordates, the central nervous system is ventral, not dorsal.
• Statement D: Correct – In many non-chordates, the heart (if present) is dorsal.
• Statement E: Correct – Many non-chordates lack a post-anal tail.

Thus, the correct answer is (3) B, D & E only.