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

(N/A) $(i)$ Location: In a cockroach,at the junction of the midgut and hindgut,a ring of $100-150$ yellow-coloured,thin,filamentous Malpighian tubules is present.
$\Rightarrow$ Function: They absorb excretory wastes from the body cavity (haemolymph) and discharge them into the hindgut for excretion.
$(ii)$ Location: These are paired structures composed of many hexagonal ommatidia,located on the dorsal surface of the head in a cockroach.
$\Rightarrow$ Function: They are responsible for mosaic vision,which provides more sensitivity but less resolution.