Q.

Select the correct statement regarding Periplaneta americana.

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a

Nervous system is located ventrally and consists of segmentally arranged ganglia joined by a pair of longitudinal connectives.

b

Grinding of food is carried out only by the mouth parts.

c

Males bear a pair of short thread like anal styles.

d

There are 16 very long malpighian tubules present at the junctions of midgut and hindgut.

answer is D.

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Detailed Solution

Anal style is a pair of short, thread-like structure present in males only. In both sexes, the 10th segment bears of pair of jointed filamentous structures called anal cerci. 

Mechanical digestion occur by mandibles and gizzard.

In some segments  nerve ganglia are absent.       

The number of Malpighian tubules is around 120 and they are present at the junction of midgut and hind gut

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Select the correct statement regarding Periplaneta americana.