Which of the following is correct about nematocyst ?

Options

A. it can be re-used
B. its ejection is conditioned reflex
C. it is ejected on contact and pierce they prey
D. due to which other Hydra doesn't come in contact with it

Answer

C

Explanation

Nematocysts are the stinging cells and are the organs of offence and defence of coelenterates , Nematocyst contains a poisonous proteinaceous fluid hypnotoxin along tube which injects the fluid into the victim. Nematocysts are activated in response to chemicals secreted by prey. They explode after coming in contact with the prey.