Which one of the following statements about all the four of Physalia, Obelia, Ctenoplana and sea fan is correct?
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a
All are triploblastic
b
Digestion is both extracellular and intracellular
c
All possess cnidoblasts
d
All are bilaterally symmetrical
answer is B.
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Detailed Solution
Digestion is both extracellular and intracellular in Physalia, Obelia, Ctenoplana and sea fan.These all are diploblastic animals and exhibit radial symmetry.Physalia, Obelia and sea fan have cnidoblasts. Ctenoplana doesn't have cnidoblasts.