Which insect is capable of surviving without it's head for a week or later?

Question

The larvae of which insect, common worldwide, are known internationally for being good at turning vegetable and animal refuse into valuable manure, and at providing feed for farm animals, while at the same time having a minimal role in spreading disease?

Answer 1

Cockroach

When head is cut in general one dies because of lack of oxygen if oxygen is there then body part can do its functions based on already given instruction by mind but a Cockroach can breath from small holes in its body (full) and oxygen supply remain intact (so cockroach survives for a week and may be more)