About how many times does the nymph of the Periplaneta americana undergo moulting before becoming an adult?

Explain the nervous system of a cockroach.

Define the following terms:
$(i)$ Vermicomposting
$(ii)$ Haemolymph

Blood of $Periplaneta$ does not carry oxygen because

In cockroach,the development is paurometabolous,meaning that development occurs through the nymphal stage. The nymph grows by moulting about $13$ times to reach the adult form. The metamorphosis process in cockroach requires approximately how many days?

How many ovarioles are found in each ovary of a cockroach?