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.
Correct Answer: B
Solution :
The nervous system of Periplaneta Americana consists of a series of fused segmentally arranged ganglia. The ganglia are joined by paired longitudinal connections on the ventral side. Three ganglia lie in the thorax and six in abdomen. Malpighian tubules are excretory organs. Each tubule is lined by glandular and ciliated cells. They absorb nitrogenous wastes and convent them into uric acid. Uric acid is extreted out through the hindgut. Food is store in sac-like structure called crop. Food is stored in crop. The crop is followed by gizzard and preventriculus. The gizzard has an outer layer of thick circular muscles and thick inner cuticle; forming six highly chitinous plate called teeth Food particles are ground in the gizzard.
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