Question

Which of the following is not found in vertebrates?

• A. Bilateral symmetry
• B. Gill opening
• C. Body scales
• D. Cnidoblasts

Answer 1

The correct option is D Cnidoblasts

Coelenterata or Cnidaria are marine animals. The name Cnidaria is derived from the cnidoblasts or cnidocytes (which contain the stinging capsules or nematocytes) present on the tentacles and the body. Cnidoblasts are used for anchorage, defense and for the capture of prey. Whereas the key features of vertebrates are notochord, pharyngeal gill slits and bilateral symmetry. Some vertebrates such as reptiles and fishes possess scales. Thus, the correct answer is option D.