A) 4
B) 7
C) 5
D) 13
Correct Answer: D
Solution :
Heart of cockroach is a pulsatile 13 chambered structure. Its inhalent openings are called ostia, which are guarded by valves. This heart is infact, the dorsal blood vessel, which pulsates with the help of external along muscles. The blood in heart flow unidirectionally from posterior end to the anterior end of the body.
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