In a cockroach, the open circulatory system does not pose a physiological barrier because ...

Where are the alary muscles found?

In female cockroach,the $7^{th}$,$8^{th}$,and $9^{th}$ sterna form a genital pouch. Which of the following pairs of sterna are primarily involved in forming the brood or genital pouch?

How many spiracles are present in a cockroach (in $pairs$)?

Which of the following statement$(s)$ is/are correct regarding the excretory system of a cockroach?
$(i)$ Excretion is performed by Malpighian tubules.
$(ii)$ They absorb nitrogenous waste products and convert them into uric acid,which is excreted out through the hindgut.
$(iii)$ In addition,fat body,nephrocytes,and urecose glands also help in excretion.

Identify $X$ and $Y$ in the given diagram of the alimentary canal of a cockroach.