The conglobate gland occurs in:

Which of the following statements is incorrect?

Which enzyme is present in the saliva of a cockroach?

Statement-$I$ :- Heart of cockroach consists of an elongated muscular tube lying along the mid-dorsal line of the thorax and abdomen.
Statement-$II$ :- In cockroach,the opening of the spiracles is regulated by the sphincters.

In cockroaches,in what form do the body cells primarily discharge their nitrogenous waste into the hemolymph?

Identify the location and function of the following structures in a cockroach:
$(i)$ Gizzard
$(ii)$ Hepatic caecum