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Question

Which of the following group organisms show the presence of pharyngeal slits at some point of their development?

A
Arthropoda
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B
Bryozoa
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C
Chordata
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D
Cnidaria
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E
Mollusca
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Solution

The correct option is C Chordata
Chordates are the highly modified phylum. It is generally characterized by the notochord. Its other peculiar characteristics are pharyngeal slits, dorsal-ventral nerve, and a post-anal tail. Pharyngeal slits are repeated segments controlled by similar developmental mechanisms. These filter-feeding organs that resemble gill slits are transiently present during the embryonic stages of tetrapod development are found invertebrate chordates such as Lancelets and Tunicates and also hemichordates living in aquatic environments.
So, the correct answer is option C.

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