Question

Which of the following is correct about nematocyst in Hydra?

• A. It is re-used.
• B. Ejection is conditioned reflex.
• C. Ejection occurs in response to contact and pierces the prey.
• D. Prevents coming in contact with other Hydra.

Answer 1

The correct option is C Ejection occurs in response to contact and pierces the prey.

Nemotocyst in the cnidoblasts/cnidocytes are present wth slight projections in the tentacles of hydra. As, it comes in contact with an organism it opens up and releases a microscopic harpoon like structure that pierces the prey.

So, the correct answer is 'Ejection occurs in response to contact and pierces the prey'.