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Biology · Class 11 Science

Ch 11Study of Animal Type: Cockroach — Class 11 Biology, concept-first.

Cockroaches are used as the representative animal type for phylum Arthropoda because they are found almost everywhere on earth — they are omnipresent. Within a home or its surroundings they are drawn to damp, moist places and to narrow crevices and cracks, where they can hide during the day and stay protected from pred…

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Key concepts

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Cockroach External Morphology

The cockroach body is elongated, bilaterally symmetrical and dorso-ventrally flattened, and is triploblastic, eucoelomate and truly segmented.

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Chapter contents

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11.1

Habit and Habitat

Cockroaches are used as the representative animal type for phylum Arthropoda because they are found almost everywhere on earth — they are omnipresent.

11.2

Systematic Position

The systematic (taxonomic) position of the cockroach places it precisely within the animal classification hierarchy, and each rank is justified by a defining feature:

11.3

External Morphology

Shape and size. The cockroach has an elongated body that is bilaterally symmetrical (the left and right halves mirror each other) and dorso-ventrally flattened (flattened from top to bottom rather tha…

11.4

Body Cavity

The cockroach possesses a true body cavity (a coelom) that surrounds its internal organs (viscera). However, because the cockroach's circulatory system is of the open type, blood is not confined to ve…

11.5

Digestive System of Cockroach

The digestive system of the cockroach is made up of three parts working together: the mouthparts (described under external morphology), a long alimentary canal, and a pair of salivary glands.

11.6

Circulatory System or Blood Vascular System

The cockroach has an open type of circulatory system — unlike a closed system, blood is not confined entirely within vessels but spends much of its circuit flowing freely through the body cavity itsel…

11.7

Respiratory System or Tracheal System

The cockroach breathes through an internal network of air-filled tubes called the tracheal system, which carries air to essentially every part of the body and lets oxygen and carbon dioxide be exchang…

11.8

Excretory System

The Malpighian tubules are the principal excretory organs of the cockroach. They are thin, yellow-coloured, thread-like structures of ectodermal origin that hang freely within the haemocoel, attached…

11.9

Nervous System

The nervous system of the cockroach is ventral in position (it runs along the underside of the body, opposite to the dorsal blood vessel), solid, and ganglionated — meaning it is organised as a chain…

11.10

Reproduction System

The cockroach is dioecious — that is, male and female individuals are separate (unlike a hermaphrodite that would carry both sexes in one body).

11.11

Interactions with Mankind

Interactions with mankind. Cockroaches interact with human life in several ways, most of them harmful:

+Exercise25 questions
  1. Q1Chemical nature of chitin is ......... (a) protein. (b) carbohydrate. (c) lipid. (d) glycoprotein.Free
  2. Q2Cockroach has ................ type of mouthparts. (a) sponging (b) chewing and biting (c) piercing and Sucking (d) lappingFree
  3. Q3Spiracle is a part of .................... system of cockroach. (a) circulatory (b) respiration (c) reproductive (d) nervousFree
  4. Q4................... is a part of digestive system. (a) Trachea (b) Hypopharynx (c) Haemocyte (d) Seminal vesiclePreview
  5. Q5..................... is also called as brain of cockroach. (a) Supra-oesophageal ganglion (b) Sub-oesophageal ganglion (c) Hypo-cerebral ga…Preview
  6. Q6Describe the digestive system of cockroach.Preview
  7. Q7Give an account on tracheal system of cockroach?Preview
  8. Q8Describe nervous system of cockroach.Preview
  9. Q9With help of neat labelled diagram, describe female reproductive system of cockroach.Preview
  10. Q10With help of neat labelled diagram, describe the digestive system of cockroach.Preview
  11. Q11A student observed that the cockroaches are killed for dissection by simply putting them in soap water. He inquired whether soap is so poiso…Preview
  12. Q12Describe the circulatory system of cockroach.Preview
  13. Q13How will you identify male or female cockroach?Preview
  14. Q14Write a note on: Gizzard of cockroach.Preview
  15. Q15Give the systematic position of cockroach.Preview
  16. Q16What would have happened if cockroach did not have gizzard?Preview
  17. Q17What is the functional difference between eyes of cockroach and human being?Preview
  18. Q18What is the functional difference between respiratory systems of cockroach and human being?Preview
  19. Q19What are anal cerci?Preview
  20. Q20What is the ganglion?Preview
  21. Q21What is the role of hypopharynx?Preview
  22. Q22What is mesenteron?Preview
  23. Q23Location of tergum.Preview
  24. Q24What is ootheca?Preview
  25. Q25How many chambers are present in heart of cockroach?Preview