Question

Animals belonging to Phylum Chordata are fundamentally characterised by the presence of structures noted as $A, B, C$ and $D$. Identify them and select the correct option.

• A. A-Notochord, B-Nerve cord, C-Gill slits, D-Post-anal part
• B. A-Nerve cord, B-Notochord, C-Gill slits, D-Post-anal part
• C. A-Nerve cord, B-Notochord, C-Post-anal part, D-Gill slits
• D. A-Nerve cord, B-Gill slits, C-Notochord, D-Post-anal part

Answer 1

Answer: (B)

The given figure shows the internal organisation of a hypothetical chordate. It posseses notochord (B) either during early embryonic stage or throughout life. The notochord lies ventral to nerve cord (A). It posseses a post anal tail (D) and paired pharyngeal gill slits (C).