The structural and functional unit of the compound eye in a cockroach is known as:

Select the correct statement from the ones given below with respect to $Periplaneta$ $americana$.

An animal that possesses compound eyes is ........

Cockroaches are brown or black bodied animals that are included in the class and phylum respectively:

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