What is the scientific name of the common cockroach?

To which order does $Periplaneta$ $americana$ belong?

Choose the incorrect statement regarding the characteristics of a cockroach.

Vision in cockroach is

The young one of a cockroach is called.....

Segments in the head of a cockroach - $P$
Segments in the thorax of a cockroach - $Q$
Segments in the abdomen of a cockroach - $R$
Select the correct option for $P, Q, R$.