Cockroach
Chapter Name : Structural Organization In Animals |
Sub Topic Code : 103_11_07_04_01 |
Topic Name : Cockroach |
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Sub Topic Name : Morphology |
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Introduction
Cockroaches are brown or black bodied animals that are included in class Insecta of Phylum Arthropoda. They are nocturnal omnivores that live in damp places throughout the world.
Pre-Requisites:
To understand morphology of a cockroach.
Activity:
Videos and pictures showing morphology of cockroach.
Real Life Question:
Why are cockroaches called nocturnal animals?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Body | segmented and divisible into three distinct regions – head, thorax and abdomen. The entire body is covered by a hard chitinous exoskeleton. |
| Head | triangular in shape, formed by the fusion of six segments and shows great mobility in all directions due to flexible neck. |
| Eyes | They have compound eyes. |
| Antennae | shows presence of sensory receptors that help in monitoring the environment.. |
| Mouth | mouthparts consisting of a labrum (upper lip), a pair of mandibles, a pair of maxillae and a labium (lower lip). A median flexible lobe, acting as tongue (hypopharynx), lies within the cavity enclosed by the mouth parts. |
| Thorax | consists of three parts – prothorax, mesothorax and metathorax.. Each thoracic segment bears a pair of walking legs. |
| Wings | The first pair of wings arises from mesothorax and the second pair from metathorax. Forewings (mesothoracic) called tegmina 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 | in both males and females consists of 10 segments. In females, the 7th sternum is boat shaped and together with the 8th and 9th sterna forms a brood or genital pouch. |
| Anal cerci | present inn both sexes, the 10th segment bears a pair of jointed filamentous structure called anal cerci. |
Learning aids / Gadgets
| Gadgets | How it can be used |
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Real life uses :
Cockroaches are of no use to humans, they are a pest.
Practical examples around us
| Examples | Explainations |
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What you learn in Theory:
The morphology of cockroach.
What you learn in Practice:
Cockroaches are a house pest and of no economic use to humans.