Single Choice

The gill-slits of chordates occur in

ABuccal cavity of aquatic animals
BPharynx of all land vertebrates
CPharnyx of all chordates embryos and pharynx of some aquatic adult chordates
Correct Answer
DPharynx of all aquatic and land vertebrates in adults as well as in their embryos

Solution

Gill slits are individual openings to gills, i.e., multiple gill arches, which lack a single outer cover. These can be traced in cartilaginous fish, such as sharks and rays. Early embryos of different vertebrates resemble each other in possessing certain similar structures, like gill slits. Therefore gill slits of chordates occur in the pharynx of all chordates embryos and pharynx of some aquatic adult chordates. Hence, option C is correct.

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