Q.
Which of the following pair of organisms lacks cnidoblasts?
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a
Ctenoplana and Beroe
b
Gorgonia and Meandrina
c
Physalia and Adamsia
d
Pennatula and Pleurobrachia
answer is A.
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Detailed Solution
Ctenoplana, Pleurobrachia and Beroe belong to Ctenophora and lack cnidoblasts. They possess colloblasts (lasso cells or glue cells).Gorgonia, Meandrina, Physalia, Adamsia and Pennatula belong to Cnidaria and have cnidoblasts.
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