One of the special characters of coelenterata only is the occurrence of:
Correct answer: D. Nematocysts
- A. Polymorphism
- B. Flame cells
- C. Hermaphroditism
- D. Nematocysts
Explanation
The cells characteristic of the coelenterates include stinging cells (cnidocytes or cnidoblasts or nematoblasts) for offence and defence. The stinging cells, when discharged, give out from a sac, the cnide or cnidocyst or nematocyst, a long threadtube that may coil around the prey, or attach to it, or inject a toxin, called hypnotoxin, into it to paralyse it.
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