Question

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

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

Answer 1

The correct option is D Males bear a pair of short thread-like anal styles

The male cockroaches are distinguished from the females by the presence of an extra pair of accessory appendages named as anal styles. It assists during copulation.
The excretory organ of cockroach is the malpighian tubules. It is found at the junction of the midgut and hindgut and is about 150 in number.
Digestion begins first at the mouth, where the parts like mandibles and maxillae help to chew the food. The next point where the food moves would be at the gizzard where it’s grinding takes place. The nervous system located ventrally consists of segmentally arranged ganglia joined by a pair of longitudinal connective.