This document defines two types of ecosystems - natural ecosystems like ponds and forests, and artificial ecosystems like aquariums and gardens. It also describes the biotic components as living things, and abiotic components as physical factors of an ecosystem like temperature, rainfall, and soil. Finally, it explains that a food chain represents the transfer of food energy as one organism consumes another, and discusses the damage caused to the ozone layer by chlorofluoro carbons.

3. Types of Ecosystem
1. Natural Ecosystem
Eg: A Pond, forest, Lakes, etc.
2. Artificial Ecosystem
Eg: An aquarium, garden, etc.

4. Components of Ecosystem
1. Biotic
All the living things like plants,
animals, microorganisms,
Human beings, etc. are called
biotic components of
ecosystem.
2. Abiotic
All the physical factors like
temperature, rainfall, wind,
soil, minerals, etc. are called
abiotic components of
ecosystem.

6. The sequence of living organisms in a community in which one
organism consumes another organism to transfer food energy is
called a food chain.

11. O O O
O O
O
O O O O
O O
O O
O O
UV Rays

13. The ozone layer is being damaged by the use of
chemicals like Chloro Fluoro Carbons (CFCs) used in
refrigerators and fire extinguishers. So the use of CFCs is
now being reduced to protect the ozone layer.