Structural Organisation Of Animals And Plants

Answer (b) Corpora allata

Answer (d) Oligodendrocytes

In the mouth parts of cockroach, the galea and lacinia form parts of the maxilla. The galea forms a sort of hood for the smaller triangular lacinia and is composed of two segments. The lacinia ends in a sharp strong chitinous tooth.

In cockroach the flow of haemolymph is heart head haemocoel perivisceral sinus pericardial sinus ostia heart. Heart in cockroach is neurogenic. Haemocoel (body cavity) is pervisceral cavity filled with colour less blood (haemolymph). When alary muscle contract the dorsal diaphragm became flat and pericardial increases. Blood from perivisceral sinus enter into pericardial sinus through pore of dorsal diaphragm become dome-shaped and blood from pericardial sinus is forced into the heart through valvular ostia then the heart and aorta contract peristaltically. Blood flow from posterior end to anterior end in heart and flow into head sinus through aorta.

Histology is the study of plant and animal tissue, it is science that deal with detailed structure, chemical composition and function of tissues, it is also called as mic roan atomy. Term histology was coined by Mayer ,