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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