Question

Hydra paralyses its prey with the help of

• A. Tentacles
• B. Nematocysts
• C. Colloblasts
• D. Epitheliomuscular cells

Answer 1

The correct option is B Nematocysts

Hydra can paralyze its prey with the help of nematocysts or stinging apparatus of the cnidocytes/cnidoblasts present on its tentacles. These stinging cells exclusive to this phylum can release toxins that can be used for defense primarily and also for procuring prey. The mechanical stimulus generated by the incoming prey will lead to the discharge of these microscopic harpoon like structure with neuro-toxin. The nematocysts thus help in paralysis of prey.

So, the correct answer is 'Nematocysts'.