The radial symmetry is found in the animals of which of the following?
Correct answer: C. Cnidaria
- A. Protozoa
- B. Porifera
- C. Cnidaria
- D. All of these
Explanation
'Radial symmetry' is the arrangement of body parts around a central axis and is only present in grade radiata. 'A' and 'B' are not the answers because both of the classes are primitive and are not diploblastic. Radial symmetry is found in the 'cnidarians' (including jellyfish, sea anemones, and coral) and 'echinoderms' (such as sea urchins, brittle stars, and sea stars).
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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