A) toxin
B) venom
C) hematin
D) hypnotoxin
Correct Answer: D
Solution :
Nematocysts or stinging cells are specialized organelle which act for defence and offence of Hydra. Each nematocyst is filled with a poisonous fluid called hypnotoxin. Hypnotoxin is a chemical combination of phenols and proteins, it paralyses the pray and kill them.
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