In cockroach,nephrocytes are concerned with

Cockroach blood does not contain respiratory pigment. It means:

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

....... is the function of nephrocytes and urecose glands.

Which cells secrete wax that is located on the outer side of the body wall?

Describe the location and function of the following structures in a cockroach:
$(i)$ Malpighian Tubules
$(ii)$ Compound eyes