Animal Kingdom Class 11 Notes - Chapter 4

The animal kingdom is one of the kingdoms among the Five-Kingdom Scheme of classification proposed by R.H. Whittaker.  The animal kingdom comprises multicellular eukaryotic organisms that do not possess a cell wall.

Basis of classification

The classification of the animal kingdom is based on the different essential characteristics such as level of organization, habitat, and symmetry.

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Levels of Organization

  • Cellular Level of Organization
  • Tissue Level of Organization
  • Organ Level of Organization
  • Organ system Level of Organization

Patterns of organ systems

  • Digestive System (Incomplete Digestive System and Complete Digestive System)
  • Circulatory System
  • Open Type
  • Closed Type

Body symmetry

  • Bilateral Symmetry
  • Radial Symmetry
  • Asymmetrical

The animal kingdom is a significant chapter in CBSE class 11. Students must prepare this chapter well to score well in the CBSE board examination. The Animal Kingdom Class 11 Notes are given here. Students can visit the links mentioned below to know more about this chapter.

These Animal Kingdom Class 11 Notes are handy for students preparing for their board examination. They can check these links to learn about Animal Kingdom and related topics to prepare better for their examination.

Also Access 
NCERT Solutions for Class 11 Biology Chapter 4
NCERT Exemplar for Class 11 Biology Chapter 4

Important Questions from Animal Kingdom Class 11 Notes

List out various factors or basis on which animals are classified.

There are many bases on which animals can be classified. For instance, they can be classified based on:

  • Levels of organization
  • Symmetry
  • Body cavity
  • Phylum

Explain how intracellular digestion differs from extracellular digestion.

Intracellular digestion, as the name implies, occurs inside the cell. It works by exposing food molecules to digestive enzymes, where it is broken down and absorbed by the cell. Initially, the food particle is brought inside the cell through phagocytosis, where a unicellular organism uses its plasma membrane to engulf a food particle and move it towards the inside of the cell. Organisms such as amoeba use this mode to acquire and digest food.

On the other hand, extracellular digestion means “digestion of food outside the cell.” In this method of digestion, the food is broken down either with the help of acid (enzymes ) or by mechanical means. Since human digestion occurs outside the cell, it is a form of extracellular digestion.

What is radial symmetry? Give examples of organisms that exhibit this character.

Radial symmetry is a characteristic of certain groups of animals where symmetry is observed about a central axis. This means these organisms have top and bottom surfaces but no right and left sides. They also have no back or front.

Radial symmetry is observed in coelenterates, echinoderms and ctenophores.

What are coelomates? Provide examples.

Coelomates are animals that possess a coelom or a body cavity.  It is found primarily in animals that form from an embryo (with three layers of tissues, namely the ectoderm, mesoderm and endoderm). Examples of coelomates include humans, fish, sea stars and earthworms.

Other Important Questions

  1. What is meant by metamerism?
  2. List out the characteristic features of Phylum Annelida.
  3. List 5 organisms that belong to the phylum Arthropoda.
  4. What is the radula? Explain its function.
  5. What are Homoiothermous animals? Give two examples.
  6. What are oviparous animals? How are they different from viviparous animals?

Frequently Asked Questions on CBSE Class 11 Biology Notes Chapter 4 Animal Kingdom


What is the basic way in which the animal kingdom is classified?

The classification of the animal kingdom is based on the different essential characteristics such as level of organization, habitat, and symmetry.


What is meant by tissue level of organisation?

The tissue level of the organization consists of a group of cells that work together to accomplish one or more specific functions.


What is extracellular digestion?

In extracellular digestion, food is broken down outside the cell either mechanically or with acid (special molecules called enzymes). Then these newly broken-down nutrients are absorbed by the cells nearby.

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