The life cycle of a cockroach exhibits ........

In a female cockroach,the number of sternites in the abdomen is .......?

Statement $-A:$ $Periplaneta$ $americana$ is a nocturnal,omnivorous,and household pest.
Reason $-R:$ It acts as a scavenger.

Which of the following statement$(s)$ is/are correct regarding cockroaches?
$(i)$ The body of the cockroach is segmented and divisible into three distinct regions - head,thorax and abdomen.
$(ii)$ Blood vascular system is of closed type.
$(iii)$ They are monoecious and both sexes have well developed reproductive organs.
$(iv)$ The development of $P. americana$ is paurometabolous,meaning there is development through nymphal stage.

If the mandible is removed from the mouthparts of a cockroach,what will happen?

Describe the external body structure of a cockroach.