Question

Presence of gill slits in the embryos of all vertebrates supports the theory of

• A. Organic evolution
• B. Biogenesis
• C. Recapitulation
• D. Metamorphosis

Answer 1

The correct option is C Recapitulation

Recapitulation theory

According to the recapitulation theory, during embryonic development general characters appear first and the specialized ones later.

The general characters of vertebrates are:

• Presence of a notochord.
• Presence of dorsal hollow nerve cord.
• Presence of pharyngeal slits.
• Presence of a post-anal tail.

Hence the presence of gill slits in embryos of all vertebrates support recapitulation theory.

Final answer:

(D) Recapitulation