Home ยป The poisonous fluid present in the nematocysts of Hydra is Animal Kingdom MCQs The poisonous fluid present in the nematocysts of Hydra is January 4, 2022 6 Views Q. The poisonous fluid present in the nematocysts of Hydra is A. toxin B. Hypnotoxin C. venom D. Haematin Answer: Hypnotoxin