Question

Select the correct statement about 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 very long malpighian tubules present at the functions of Midgut and hindgut.
• D. Grinding of food is carried out only by mouth parts.

Answer 1

Answer: (B)

Periplaneta americana (American Cockroach) have a well developed nervous system. Their central nervous system consists of the brain and a ventral nerve cord. The nervous system contains fused segmentally arranged ganglia joined by paired longitudinal connectives on the ventral side. A pair of unsegmented, thread-like anal styles is attached to the $9^{\text {th }}$ sternite of the male cockroaches. Malpighian tubules arise from the junction of midgut and hindgut. Grinding of food is done exclusively by the mandible.