In cockroach,nephrocytes are concerned with

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

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?

Malpighian tubules remove excretory products from:

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.

Which of the following structures does not help in excretion in the cockroach?