Zoology - Structural Organisation in Animals Question with Solution | TestHub

Cockroaches belong to Phylum Arthropoda. The body is divided into head, thorax, and abdomen. Head bears compound eyes. These eyes consist of many small structures known as ommatidia. These are around 2000 in number. These are responsible for mosaic vision. Male cockroaches show the presence of three phallomeres which represents external genitalia and these are made up of chitin. Female cockroaches lay fertilized eggs in the form of oothecae. On an average female lays around 9-10 oothecae and each ootheca has 14-16 eggs. Excretion is by Malpighian tubules. These do not form separate system bu are associated with alimentary canal. Malpighian tubules are seen at the junction of mid-gut and hind gut and are 100-150 in number.