Question

it is said that when the head of cockroaches cut-off it will still live for as long as 1 week. justify the statement

Answer 1

When the head of a cockroach is cut-off, it can still live for as long as one week because they have open circulatory system and oxygen directly reach the tissues through spiracles. Also, the circulatory system and respiration are not controlled by brain. Therefore, head portion is only for eating and drinking without which cockroach can live for a week.