Which of the following statements is incorrect?
Cockroaches exhibit mosaic vision with less sensitivity and more resolution
A mushroom- shaped gland is present in the $6^{th}- 7^{th}$ abdominal segments of male cockroach.
A pair of spermatheca is present in the $6^{th}$ segment of female cockroach.
Female cockroach possesses sixteen ovarioles in the ovaries.
The blood of cockroach contains no respiratory pigment. It means that
Delete odd one.
Explain : Cockroach is harmful for human beings.
The figure given below shows the head region of cockroach. Identify $A$ to $F$.
Which one of the following is not a characteristic feature of frog?