Question

Describe the external Morphology of Cockroach.

Answer 1

The cockroach is a member of phylum Arthropoda, order Blattodea and class Insecta. Cockroaches may cause different diseases in humans like typhoid, amoebiasis, dysentery and also polio by contaminating food materials.

Complete answer:
The cockroach is a member of phylum Arthropoda and their body has a dark brown colour. The exoskeleton of the cockroach is made up of chitin. The body of cockroach is divided into three distinct parts or regions - Head, Thorax and Abdomen.

The head of the cockroach is triangular in shape and it is made up of a fusion of six segments. It contains a pair of compound eyes and a pair of antennae in the front side. The mouth is present at the anterior side of the head. It contains a pair of mandibles and maxillae along with a labium. It is connected to the thorax with the help of a flexible neck or prothorax.
The thorax of the cockroach is divided into three parts - prothorax, mesothorax and metathorax. Prothorax connects the head and thorax, which acts as the neck. A pair of wings arises from each mesothorax called tegmina and metathorax, respectively used for flight. Thorax contains a pair of legs in each segment total of three pairs of legs are present.
The abdomen of a cockroach is made up of ten segments. Each segment contains a pair of spiracles that help in respiration. The segments, 7, 8 and 9th sternum bears a large or broad genital pouch. The 10th segment contains a filamentous structure called anal cerci found in both male and female cockroach. The male cockroach contains thread-like anal styles.

Note:
The Cockroach Lives in dark and humid (damp) places inside our homes. They Came out in dark conditions or in the night because they are nocturnal creatures. They are omnivorous and they feed on all types of organic matters.