Number of Malpighian tubules present in a cockroach is:

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

The alary muscles found in a cockroach are associated with the:

In cockroaches,at the junction of $............$ and $............$,about $............$ yellow-colored,thin,thread-like Malpighian tubules are present.

The given figure shows the open circulatory system of a cockroach. Identify the structure that facilitates the flow of haemolymph by its contraction and relaxation.

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?