Question

give scientific reason
our body irrates if it comes in contact witrh jelly fish

Answer 1

as jellyfish legs contains some certain harmful chemicals we get irritated .even the chemicals can kill the human

Answer 2

When this tentacles come into contact with human skin they can inject you with venom from thousands of microscopic barbed stingers. Most often they result in immediate pain and red, irritated marks on the skin. Some jellyfish stings may cause more entire body illness. And in rare cases jellyfish sting can become fatal.