The female cockroach can be distinguished from the male cockroach by the presence of
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a
a pair of short, thread-like anal styles
b
a boat-shaped 7th sternum in the abdomen
c
a pair of jointed filamentous structures called the anal cerci
d
a pair of thread-like antennae arising from membranous sockets lying in front of eyes
answer is B.
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Detailed Solution
In female cockroach, the 7th sternum is boat-shaped and forms a brood pouch along with the 8th and 9th sterna. The anal styles are present in males but not females. The anal cerci are present in both males and females.