Identify $X, Y$ and $Z$ in the given figure of the male reproductive system of a cockroach.

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.

Which of the following organisms possesses high and regular blood pressure?

In the male cockroach,in which part of the reproductive system are the sperms stored?

Describe the respiratory system of a cockroach.

How many Malpighian tubules are present at the junction of midgut and hindgut in a cockroach?