Each ootheca of a cockroach contains $............$ eggs.

What external changes are visible after the last moult of a cockroach nymph?

An animal that possesses compound eyes is ........

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

The mouth parts of a mosquito are of which type?

The number of spiracles present in a cockroach is: (in $pairs$)