Question

Pharyngeal gill slits

• A. Are unique characteristic of chordates
• B. Are found in fishes, crabs, snails, aquatic insects
• C. Are found in higher vertebrates and invertebrates
• D. Are not found in protochordates, but present in vertebrates at least during the embryonic life

Answer 1

The correct option is A Are unique characteristic of chordates

Pharyngeal slits are filter-feeding organs found in Invertebrate chordates (lancelets and tunicates) and hemichordates living in aquatic environments. These repeated segments are controlled by similar developmental mechanisms. Some hemichordate species can have as many as 200-gill slits. Pharyngealslits resembling gill slits are transiently present during the embryonic stages of tetrapod development.

So, the correct answer is 'Are unique characteristic of chordates'.