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Q.

Which of the following is true about cockroaches?

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a

Anal styles are unjointed structures found in both the sexes.

b

In males, genital pouch is formed by the 7th, 8th, and 9th sterna.

c

The exchange of respiratory gases takes place in tracheoles.

d

The nerve cord consists of a series of 9 pairs of segmental ganglia.

answer is C.

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Detailed Solution

Anal styles are unjointed and present in male cockroaches. In males genital pouch is formed by the 9th, 10thterga dorsally, and 9thsternum ventrally. Gaseous exchange occurs at tracheoles by diffusion. Segmental ganglia are nine, 3 thoracic, and 6 abdominal.
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