The mouthparts of a housefly are known as:

The number of spiracles present in a cockroach is: (in $pairs$)

Hind wings of mosquitoes are termed as

Describe the structure of oothecae in cockroach.

In cockroach,the male genital pore opens into which region?

Which of the following statement$(s)$ is/are correct?
$(i)$ Cockroaches are brown or black bodied animals that are included in class $Insecta$ of phylum $Arthropoda$.
$(ii)$ Males bear a pair of short,thread-like anal styles which are absent in females.
$(iii)$ The heart of a cockroach consists of an elongated muscular tube lying along the mid-dorsal line of the thorax and abdomen.
$(iv)$ The nymph grows by moulting about $13$ times to reach the adult form.