Question

Number of diaphragms present in the haemocoel of Periplanata is

• A. One
• B. Two
• C. Three
• D. None

Answer 1

The correct option is B Two

In cockroach, the haemocoel extends from anterior end of the body to the posterior end. The haemocoel, in fact, lacks the epithelium of a true coelom and is divided into three bigger sinuses by two horizontal septa. The septa are muscular membranous structures; one dorsal diaphragm and the other ventral diaphragm. Hence there are two diaphragms present in the haemocoel.

So the correct answer is 'Two'.