Question

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

(1) 5^th segment 

(2) 10^th segment 

(3) 8^th and 9^th segment 

(4) 11^th segment

Answer 1

Correct option is (2) 10^th segment   

both sexes of cockroach, 10^th segment bears a pair of jointed filamentous structures called anal cerci.

Options (1), (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.