Question

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

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

Answer 1

Answer: (B)

Males bear a pair of short thread like anal styles

The cockroach consists of a dorsal brain attached with circumcenter connectives to ventral nerve cord with paired segmental ganglia. The excretory organs of cockroach consist of a long white thread like blind ending 150 malpighian tubules present at the transition of the mid and hindgut. Grinding and chewing of food take place with the help of mandibles, maxillae, labrum and labium.

Therefore, the correct answer is option B.