Describe the structure of oothecae in cockroach.

(N/A) $\Rightarrow$ On an average,females produce $9-10$ oothecae,each containing $14-16$ eggs.
$\Rightarrow$ The development of $P. \text{ americana}$ is paurometabolous,meaning development occurs through nymphal stages.
$\Rightarrow$ The nymph looks very much like the adult. The nymph grows by moulting about $13$ times to reach the adult form.
$\Rightarrow$ The next-to-last nymphal stage has wing pads,but only adult cockroaches have fully developed wings.