Which one of the following does not occur in a cockroach leg?

Mark the odd one in each series:
Maxilla; mandible; labrum; antennae

Based on the position of the head,the cockroach is known as ..........

What is not present in a female cockroach?

In cockroach,the male genital pore opens into which region?

On an average,female $Periplaneta$ produces $.......$ oothecae,each containing $......$ eggs. Choose the correct option which fills the blanks respectively.