Question

Which one is absent in Branchiostoma?

• A. Head
• B. Gill slits
• C. Notochord
• D. Dorsal hollow nerve cord

Answer 1

Answer: (A)

Head

A) The notochord in branchiostoma extends into the potential head region hence giving an appearance of no head. So, we say that branchiostoma has no head.

B) Since branchiostoma is a part of the phylum Chordata it has gill slits on the pharynx.

C) Since branchiostoma is a part of the phylum Chordata it has a dorsally placed notochord.

D) Since branchiostoma is a part of the phylum Chordata it has a dorsal hollow nerve cord.

So, the correct answer is 'Head'.