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# When the head of cockroach is cut it doesnot die immediately because :-

$\begin{array}{1 1}(A)\;\text{Its mouth part are biting and chewing type}\\(B)\;\text{Head contains segments}\\(C)\;\text{It has open circulation}\\(D)\;\text{Its nervous system is diffused due to ganglia }\end{array}$

As ganglia are arranged segmentwise,not much of the nervous system is damaged when head of cockroach is cut .
Hence (D) is the correct answer.