Question

Cockroach cannot survive in the water because it's respiratory organ is-

Answer 1

because there was no gills of cockroach

Answer 2

Answer:

A cockroach breathes through tiny openings(spiracles), present all over it's body which are connected to the Respiratory tube(trachea) via valves. If the spiracles don't get direct access to air, like in the given case, a cockroach may not survive.

Hope this answer helped!