Question

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

• A. The respiratory system open through 13 pairs of small holes on the dorsal side of the body
• B. Males bear a pair of short thread like anal styles
• C. There are 16 very long Malpighian tubules present at the junction of midgut and hindgut
• D. Grinding of food is carried out only by the mouth parts

Answer 1

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


Male cockroaches bear a pair of short thread like structure known as the anal styles. The presence of anal styles is a characteristic feature of male cockroach. Anal styles are absent in female cockroach.

The respiratory system consists of a network of trachea, that open through 10 pairs of small holes called spiracles present on the lateral side of the body.

There are 100-150 long tubular structures called the Malpighian tubules that are present in between the midgut and hindgut.

The mouth parts are involved in chewing and biting of food. The grinding of food is also performed by gizzard.