In both sexes of cockroach, a pair of jointed filamentous structures called anal cerci are present on

Step-by-step solution

Correct answer is option (1), because in both sexes of cockroach, 10^ th segment bears a pair of jointed filamentous structures called anal cerci. Options (2), (3) and (4) are incorrect because 5^ th , 8^ th and 9^ th segments do not bear such structures. In adult cockroaches only 10^ th segments are present in abdomen. 11^ th abdominal segment is absent.