Classification of Animals
Question
How many of the following are correct about Obelia?
(i) Radial symmetry
(ii) Diploblastic
(iii) Cellular level of organisation
(iv) Digestion is intracellular only
(v) Exhibit two basic body forms called poly and medusa
Moderate
Solution
Obelia belongs to phylum Cnidaria. It exhibits tissue level of organisation (not cellular). It is a diploblastic, radially symmetrical, polymorphic organism (exhibits two forms-polyp and medusa forms). Digestion is both intra and extracellular in these organisms.
Poriferans exhibit cellular level of organisation.
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