Question
Biology Question on Kingdom Animalia
One of the special characters of coelenterata only is the occurrence of
A
polymorphism
B
flame cells
C
hermaphroditism
D
nematocysts.
Answer
nematocysts.
Explanation
Solution
The cells characteristic of the coelenterates include stinging cells (cnido-cytes 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 thread-tube that may coil around the prey, or attach to it, or inject a toxin, called hypnotoxin, into it to paralyse it.