Which of the following characteristics is incorrect with respect to cockroach?
A ring of gastric caeca is present at the junction of midgut and hind gut.
Hypopharynx lies within the cavity enclosed by the mouth parts.
In females, $7^{\text {th }}-9^{\text {th }}$ sterna together form a genital pouch.
$10^{\text {th }}$ abdominal segment in both sexes, bears a pair of anal cerci.
Choose incorrect answer about characters shown in cockroach.
The figure given below shows the alimentary canal of cockroach with few structures labelled as $1,2,3$ and $4 .$ Identify the correct identification of the structure which is also called proventriculus and helps in grinding the food particles.
The blood of cockroach contains no respiratory pigment. It means that
In cockroach, which of the following is the principal motor centre?
Explain the digestive system of cockroach with the help of a labelled sketch.