Question:

Which of the following is not a character of chordates?

Updated On: Aug 1, 2022
  • ventral nerve cord
  • rod like notochord
  • pharyngeal gill slits
  • bilateral symmetry
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The Correct Option is A

Solution and Explanation

All the chordates possess four main characters either in the embryonic or adult stage. These characters include notochord, dorsal hollow nerve cord, pharyngeal gill slits and tail. The notochord is solid, stiff but flexible rod-like structure situated between dorsal hollow nerve cord and the alimentary canal. The nerve cord of chordates is always hollow and lies dorsal to the notochord. All the chordates have at some stage of life, a series of paired narrow openings, the gill slits on the lateral sides of the pharynx. Tail is a post anal part of the body which is reduced or absent in many adult chordates.
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Concepts Used:

Animal Kingdom

Animals are eukaryotic, multicellular species that belong to the Kingdom Animalia. Every animal has a distinct characteristic. They get energy either by feeding on plants or on other animals. There are millions of species that have been recognized, few shares similar characteristics while others vary drastically.

Kingdom Animalia comprises all animals. In the midst of the five kingdoms, the largest kingdom is the animal kingdom. Animals are multicellular eukaryotes. Though, like plants, they do not possess chlorophyll or a cell wall. Therefore, members of the animal kingdom indicate a heterotrophic mode of nutrition. Kingdom Animalia is further classified into ten different subphyla based on their body designs or differentiations.

The different phyla of the Kingdom Animalia are as follows:

  1. Porifera
  2. Coelenterata (Cnidaria)
  3. Platyhelminthes
  4. Nematoda
  5. Annelida
  6. Arthropoda
  7. Mollusca
  8. Echinodermata
  9. Hemichordata
  10. Chordata

Read More: Classification of Animal Kingdom