The organ of mastication in a cockroach is:

Which of the following statement$(s)$ is/are correct about the nervous system of a cockroach?
$(i)$ It consists of a series of fused segmentally arranged ganglia joined by paired longitudinal connectives on the ventral side.
$(ii)$ There are six ganglia lie in the thorax,and three in the abdomen.
$(iii)$ The sense organs are antennae,eyes,maxillary palps,labial palps,and anal cerci,etc.
$(iv)$ Each eye consists of about $5000$ hexagonal ommatidia.

Explain the reproductive system of a male cockroach.

Describe the location and function of the following structures in a cockroach:
$(i)$ Malpighian Tubules
$(ii)$ Compound eyes

Which one of the following is one of the paths followed by air or $O_2$ during respiration in the adult male $Periplaneta$ $americana$ as it enters the animal body?

Which of the following statements is false regarding the heart of a cockroach?