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Q.

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

broad abdomen with a boat-shaped 7th sternum.

c

a pair of jointed filamentous structures called the anal cerci

d

three  phallomeres in genital pouch  

answer is B.

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Detailed Solution

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In female cockroach, abdomen is broad, 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.

Three phallomeres are present in the genital pouch of males, whereas three pairs of gonapophyses are present in females.

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The female cockroach can be distinguished from the male cockroach by the presence of