In cockroach,nephrocytes are concerned with

The given figure shows the digestive system of a cockroach with a few structures marked as $A, B, C$ and $D$. Identify structures $A$ to $D$.

In which part of the cockroach is the maximum digestion observed?

Select the incorrect option regarding the nervous system of a cockroach.

Gizzard (proventriculus) in cockroach lies between

In cockroaches,at the junction of $............$ and $............$,about $............$ yellow-colored,thin,thread-like Malpighian tubules are present.