The poisonous fliud present in the nematocyst of Hydra is
Toxin
Venom
Haematin
Hypnotoxin
As we have learned
Cnidoblasts/ nematocysts -
Specialized interstitial cells of the epidermis is called cnidoblasts.
- wherein
They are the organs for offence and defence.
Hypnotoxin filled sac in present inside the cytoplasma.
Hypnotoxin is a protein which is poisonous in nature