Male and female cockroaches can be distinguished externally through:

The figure given below shows the head region of a cockroach. Identify $A$ to $F$.

Which of the following is a characteristic feature of the cockroach regarding sexual dimorphism?

The diagram represents the posterior end of a male cockroach. Choose the correct combination of labelling.

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.

The cockroach is ....... .