Morphology And Anatomy Of Cockroach Pdf
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- morphology and anatomy of cockroach class 11 pdf
- MORPHOLOGY AND ANATOMY OF COCKROACH class xi biology
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Insect morphology is the study and description of the physical form of insects. The terminology used to describe insects is similar to that used for other arthropods due to their shared evolutionary history. Three physical features separate insects from other arthropods: they have a body divided into three regions called tagmata head, thorax, and abdomen , have three pairs of legs, and mouthparts located outside of the head capsule. It is this position of the mouthparts which divides them from their closest relatives, the non-insect hexapods , which includes Protura , Diplura , and Collembola.
morphology and anatomy of cockroach class 11 pdf
Periplaneta americana is the common species of cockroach. An adult cockroach is about 34 — 53 mm long. Wings extend beyond the tip of the abdomen in males. The body is segmented into three distinct regions, viz. The whole body is covered by a brown coloured hard exoskeleton which is made up of chitin. In each segment, the exoskeleton has hardened plates; called sclerites.
The sclerites are called tergites; dorsally; and sternites; ventrally. The ventral and dorsal sclerites are joined together by a thin and flexible articular membrane. This is called arthrodial membrane. Head: The head is triangular in shape. It lies anteriorly at right angles to the longitudinal body axis. The head is formed by the fusion of six segments. The flexible neck facilitates movement in all directions.
A pair of compound eyes is present in the head capsule. Membranous sockets lie in front of eyes and a pair of thread-like antennae arises from them. Antennae have sensory receptors. Mouth Parts: The mouth parts are at the anterior end of the head. The mouth parts consist of a labrum upper lip , a pair of mandibles, a pair of maxillae and a labium lower lip.
A median flexible lobe lies in the cavity which is enclosed by the mouth parts. This lobe acts as tongue hypopharynx. Thorax: The thorax consists of three parts, viz. The head is connected with the thorax by a short extension of prothorax; called neck. Each thoracic segment bears a pair of walking legs. The first pair of wings arises from mesothorax and the second pair arises from metathorax. Forewings are called tegmina. They are opaque dark and leathery and cover the hind wings when at rest.
The hind wings are transparent, membranous and are used in flight. Abdomen: The abdomen consists of 10 segments. In females, the 7th segment is boat shaped. The 7th sternum; together with the 8th and 9th sterna; forms a brood or genital part. The anterior part of the genital part contains the female gonopore, spermathecal pores and collateral glands. In males, the genital pouch lies at the hind end of abdomen. It is bound dorsally by the 9th and 10th terga and ventrally by the 9th sternum.
It contains the dorsal anus, ventral male genital pore and gonapophysis. A pair of short, thread-like anal styles is present in males. In both sexes, the 10th segment bears of pair of jointed filamentous structures called anal cerci. Alimentary Canal: The alimentary canal is divided into three regions, viz. The mouth opens into a short tubular pharynx.
The pharynx opens into a narrow tubular oesophagus. The oesophagus opens into a sac-like structure called crop. Food is stored in the crop. The crop is followed by gizzard and proventriculus. 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. The entire foregut is lined by cuticle. At the junction of foregut and midgut, a ring of 6 — 8 blind tubules are present.
These are called gastric or hepatic cecae and secrete digestive juice. The hindgut is broader than the midgut. The hindgut is differentiated into ileum, colon and rectum. The rectum opens through anus. Body Segments in Cockroach Head: The head is triangular in shape.
MORPHOLOGY AND ANATOMY OF COCKROACH class xi biology
Register Now. Hey there! We receieved your request. The adults of the common species of cockroach, Periplaneta americana are about mm long with wings that extend beyond the tip of the abdomen in males. The body of the cockroach is segmented and divisible into three distinct regions - head, thorax and abdomen. In each segment, exoskeleton has hardened plates called sclerites tergttes dorsally and sternites ventrally that are joined to each other by a thin and flexible articular membrane arthrodial membrane.
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Youtube - Hindi. Class 11 Biology Structural Organisation In Animals Morphology and anatomy of cockroach Morphology and anatomy of cockroach Cockroaches are brown or black bodied animals that are included in class Insecta of Phylum Arthropoda. They have long antenna, legs and flat extension of the upper body wall that conceals head. They are pests because they destroy food and contaminate it with their smelly excreta and also transmit various types of bacterial diseases.
Periplanata Americana, a common species of cockroach. Exoskeleton is thick and hard and is made up of calcareous plates called sclerites. There are ten segments are present on dorsal side which is called tergum and ventral side is known as sternum. It protects the body of cockroach from loss of water and provides rigidity and surface for the attachment of body muscles. They cover the hind wings and are protective in function.
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