In cockroach,which of the following is the principal motor centre?

Which accessory digestive gland is found in a cockroach?

The heart of a cockroach is........

Describe the circulatory system of a cockroach.

Explain the nervous system of a cockroach.

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?