2012 AIPMT-PRE Structural Organisation in AnimalsCockroach Medium Question 2 of 4 in Cockroach

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

A Grinding of food is carried out only by the mouth parts
B Nervous system located dorsally, consists of segmentally arranged ganglia joined by a pair of longitudinal connectives
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

The answer is C.

Solution

Male cockroaches bear a pair of short, thread-like anal styles, which are absent in females.
Food is also ground in the gizzard; the nerve cord is ventral, not dorsal; and there are 100–150 Malpighian tubules.

Concept Features of cockroach

Cockroach in past papers

4 questions from this chapter have appeared across 4 exam years.