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Select the correct statement from the ones given below with respect to Periplaneta americana.

1. Nervous system located dorsally, consists of segmentally arranged ganglia joined by a pair of longitudinal connectives.
2. Males bear a pair of short thread like anal styles.
3. There are 16 very long Malpighian tubules present at the junctions of midgut and hindgut.
4. Grinding of food is carried out only by the mouth parts.

Correct answer: Males bear a pair of short thread like anal styles.

Solution

Male Periplaneta americana have a pair of short thread-like anal styles, which are absent in females. The other statements are incorrect because the nervous system is ventral, Malpighian tubules are more numerous, and food grinding also involves the gizzard.

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