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Which of the following is a chordate feature not shared by the non chordates?
(A) Pharyngeal gill slits
(B) Bilateral symmetry
(C) Metamerism
(D) Axial organisation.

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Last updated date: 28th Mar 2024
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MVSAT 2024
Answer
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Hint: Animals in the phylum Chordata consist of 4 key characteristics like one notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.

Complete answer: Chordates consist of 4 diagnostic characters either inside the embryonic or mature stage. The Chordata is the animal phylum with which all every individual is most closely familiar because it consists of individual and different vertebrates. However, not all chordates are vertebrates. All chordates have the subsequent functions in their life, they are –
Pharyngeal slits – It is a sequence of openings that connect the interior of the throat to the outside of the "neck". These are often, however not always, used as gills.
Dorsal nerve cord – It is a collection of nerve fibers which runs down the "back". It connects the brain with the lateral muscles and different organs.
Notochord – It is a cartilaginous rod going underneath, and supporting the nerve cord.
Post-anal tail – It is an extension of the body beyond the anal opening.

Now lets us find the solution from given options
1. Notochord, pharyngeal gill slits and post anal tail is absent in non-chordate animals. In non-chordates, the central nervous system is ventral, solid and double.
2. The body is bilaterally symmetrical in chordates; at the same time as in the Non-chordates body can be radial, bi-radial, and bilateral in their symmetry.
3. Metamerism is first visible in annelids in the animal kingdom. It is also found in kinorhyncha, arthropods and most chordates. But in non-chordates, metamorphism is true or pseudo metamerism or absent.
4. The notochord is found among the digestive tube and the nerve cord; it acts as the primary axial support of the body during the animal's entire life. Chordates are animals with a spine or notochord, at the same time as non-chordates are animals without a spine or notochord.

Thus, the correct solution is alternative A. i.e. Pharyngeal gill slits.

Note: Non-chordates are animals without a notochord; it is the rod-like elastic shape that helps the body. The common features of Non-Chordates are- they are cylindrical, triploblastic, coelomate, or pseudocoelomate animals.