Poisonous fluid present in nematocysts of Hydra is

Hypnotoxin

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Haematin

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Haemozoin

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Agglutinogen

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Solution

The correct option is A Hypnotoxin
Hydra is a Coelenterate organism with Cnidocytes/Cnidoblasts that have stinging cells or nematocytes. These nematocytes have a neurotoxin or hypnotoxin that can paralyze its prey. This is made use of by the organism during defense or any danger.
So, the correct answer is 'Hypnotoxin'.

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