In female cockroaches,the $Gynovalvular$ plates are modifications of which of the following?

Which of the following statement$(s)$ is/are correct regarding the respiratory system of a cockroach?
$(i)$ It consists of a network of trachea that open through $12$ pairs of small holes called spiracles present on the lateral side of the body.
$(ii)$ Thin branching tubes carry oxygen from the air to all the parts.
$(iii)$ The opening of the spiracles is regulated by sphincters.
$(iv)$ Exchange of gases takes place at the tracheoles by diffusion.

In which segment of the body of the male cockroach is the mushroom-shaped gland found?

Select the incorrect option regarding the nervous system of a cockroach.

Explain the nervous system of the cockroach.

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