The organisms attached to the substratum generally possess:
Correct answer: C. Radial symmetry
- A. One single opening to the digestive canal
- B. Cilia on the surface to create water current
- C. Radial symmetry
- D. Asymmetrical body
Explanation
The organisms attached to the substratum possess radial symmetry in all vertical planes. All the animals belonging to cnidaria (e.g. jellyfish) and echinodermata (e.g. starfish) are radially symmetrical and typically sessile in their adult form. In radial symmetry, the parts in an organ or organism, when cut through the centre in any direction, produce two halves that are mirror images of each other.
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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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