The colleterial glands in a cockroach help in .....

Which secretion is responsible for the characteristic pungent odor in cockroaches?

The figure given below shows the alimentary canal of a cockroach with a few structures labelled as $1, 2, 3$ and $4$. Identify the structure which is also called proventriculus and helps in grinding the food particles.

Identify the correct sequence of organs in the digestive system of a cockroach.

What is the position of the testis in Periplaneta americana?

The body cavity present in a cockroach is called .......