Question

Abdominal segments in male and female cockroach are
(a)10,10
(b)9,10
(c)8,10
(d)9,9

Answer 1

Hint: The body of a cockroach is segmented. It is divisible into; head, thorax, and abdomen. The abdomen is the final piece, and it contains reproductive organs. The number of abdominal segments is the same in both the sexes. The 10th segment bears of pair of jointed filamentous structures called anal cerci, which is present in both the sexes. The 7th, 8th, and 9th sterna from a genital pouch in females. The male reproductive system is present in the 4th and 6th segments of the abdomen.

Complete answer:
The abdomen in both males and females consisted of 10 segments. Cockroaches are brown or black bodied animals that are included in class Insecta of the phylum Arthropod. They have a long antenna, legs, and flat extensions of the upper body wall that conceals the head. The thorax consists of three parts prothorax, metathorax, and mesothorax. The first pair of wings arise from the mesothorax and the second pair from the metathorax. Forewings are called tegmina. They are opaque dark and leathery and cover hind wings when at rest. The hind wings are transparent, membranous and are used in flight. In both sexes, the 10th segment bears a pair of jointed filamentous structures called anal cerci. In males, the genital pouch or chamber lies at the hind end of the abdomen. In females, the 7th sternum with the 8th and 9th eternal forms a brood or genital pouch whose anterior portion contains female gonopore. Each segment of the thorax has a pair of walking legs. The head is formed by the fusion of 6 segments. The flexible neck facilitates the movement in all directions. The abdomen consists of 10 segments. In females, the 7th segment is boat-shaped. A pair of short thread-like anal styles are present in males.

Additional Information: -The alimentary canal of a cockroach is divided into three regions, forgot, midgut and hindgut. The mouth opens into a narrow tubular esophagus.
-The nervous system of the cockroach is divided into the central nervous system, peripheral nervous system, and sympathetic nervous system.
-Respiration in the cockroach occurs through the trachea present on the lateral sides of the body.
-The excretion occurs through violated and glandular Malpighian tubules.
-The circulatory system in cockroaches is an open circulatory system.
So, the correct answer is ‘10,10’.

Note: The body of a cockroach is elongated and segmented. It is dark brown or reddish-brown in color. The exoskeleton is coated with a wax impermeable to water. It protects the body from loss of water and provides rigidity and surface for the attachment of body muscles. The adjacent segments are joined by a thin, soft, and flexible arthrodial membrane. The segments on the dorsal side are called Tergum and those on the ventral side are called the sternum. The cockroach has three pairs of jointed appendages and two pairs of wings.