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B
4-6
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C
6-8
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D
5-7
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Solution
The correct option is B 4-6 Cockroaches are dioecious and both sexes have well developed reproductive organs. Male reproductive system consists of a pair of testes lying one on each lateral side in 4th - 6th abdominal segments. From each testis arises a thin vas deferens, which opens into ejaculatory duct through seminal vesicle.