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Male cockroach can be distinguished from female cockroach through


Longer antennae


Longer abdomen


Wingless body


All the above


The abdomen in both males and females consists of 10 segments. In males, genital pouch or chamber lies at the hind end of abdomen bounded dorsally by 9th and 10th terga and ventrally by the 9th sternum. It contains dorsal anus, ventral male genital pore, and gonapophysis. Male Cockroach has longer and narrow abdomen.
So the correct answer is 'Longer abdomen'.

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