1. Chapter 21 Living Things and Their Environment

2. What is an Ecosystem?? What kinds of ecosystems do you know of??

3. Ecosystem An ecosystem is made up of all living and non-living things that interact in a particular area

4. Habitats The place where an organism lives and that provides the things the organism needs.

5. Habitats A single ecosystem can contain many habitats For Example: In a forest ecosystem, mushrooms grow in the damp soil, bears live on the forest floor and termites live in fallen tree trunks

6. Factors in an Ecosystem An ecosystem is made up of both living and non-living things

7. Living things in an Ecosystem The living parts of an ecosystem are called biotic factors Biotic factors can include 1.Trees 2.Grass 3.Animals

8. The non-living parts of an Ecosystem The non-living parts of an ecosystem are called abiotic factors

9. Abiotic Factors in an Ecosystem Abiotic Factors can include 1.Water 2.Sunlight 3.Oxygen 4.Temperature 5.Soil

10. Water All living things require water to carry out their life processes

11. Sunlight Because sunlight is necessary for photosynthesis, it is an important factor for plants, algae and other living things

12. Oxygen Most living things require oxygen to carry out their life processes

13. Temperature The temperatures that are typical of an area determine the types of organisms that can live there.

14. Soil Soil is a mixture of rock fragments, nutrients, air, water and decaying remains of living things.

15. Knowledge Check How do Abiotic factors differ from Biotic Factors?

16. Populations and Communities

17. Populations All members of one species in a particular area The area that a population lives can be as small as a single blade of grass or as large as the whole planet

18. Communities Most ecosystems contain more than one type of organism All different populations that live together in an area make up a community

19. So what is the difference between an organism, population and a community ??

20. Organism Population Community

21. Parts of an Ecosystem A single organism is the smallest unit An organism with other members of its species is a population This population belongs to a community of different species