Draw a labelled diagram of alimentary canal of a cockroach.

2 Answer the following:  (i) What is the function of nephridia?(ii) How many types of nephridia are found in earthworm based on their location?  3 Draw a labelled diagram of the reproductive organs of an earthworm. 5 Distinguish between the followings(a) Prostomium and peristomium(b) Septal nephridium and pharyngeal nephridium 6 What are the cellular components of blood?