1. All Living Things Share Common Characteristics
Basic Unit is the Cell
They Reproduce
Grow & Develop
copyright cmassengale

2. Common Characteristics
4. Obtain & Use Materials & Energy
5. Respond To Their Environment
6. Maintain A Stable Internal Environment
copyright cmassengale

3. Characteristics of Organisms
copyright cmassengale

4. 1. Organisms are made of Cells
copyright cmassengale

5. copyright cmassengale
Facts About Cells
Cells are the smallest living unit of an organism
All cells contain living material called cytoplasm
All cells are surrounded by a cell membrane that controls what enters & leaves the cell
copyright cmassengale

6. copyright cmassengale
More Cell Facts
Cells are complex & highly organized
Cells have parts called organelles that do different jobs
e.g. Chloroplasts in plants make sugars
copyright cmassengale

7. Organisms are Grouped by their Number of Cells
Unicellular Organisms
Living Organism Made Up Of One Cell
Multicellular Organisms
Living Organism Made Up Of Many, Specialized Cells
What are some specialized cells found in our bodies?
copyright cmassengale

8. 2. Organisms Reproduce to Pass on their Genetic Traits
copyright cmassengale

9. Two Types of Reproduction
Sexual Reproduction
Involves 2 parents
Egg fertilized by sperm to make a ZYGOTE
Offspring DIFFERENT from parents
copyright cmassengale

10. Two Types of Reproduction
Asexual Reproduction
Involves a single organism or cell
Cell divides
Offspring IDENTICAL to parent
copyright cmassengale

11. 3. Organisms Grow & Develop
copyright cmassengale

12. copyright cmassengale
Growth & Development
Organisms grow by producing MORE CELLS & by cell ENLARGEMENT
Organisms develop as they mature into an adult organism
copyright cmassengale

13. 4. Cells Require Food & Energy
copyright cmassengale

14. copyright cmassengale
Food Requirements
Autotrophs can make their own food
What kind of organism would need to make it’s own food?
Plants!
copyright cmassengale

15. copyright cmassengale
Food Requirements
Heterotrophs can NOT make their own food
They must consume other organisms
Herbivores eat plants
Carnivores eat meat
Omnivores eat plants & animals
copyright cmassengale

16. 5. Organisms Respond to Stimuli
Organisms Respond to stimuli (Temperature, Water, Food Supplies, etc.) In Order To Survive & Reproduce
copyright cmassengale

17. Responses to Stimuli Internal stimuli: External stimuli:
If you feel hungry then look for food, you are responding to an internal stimulus (the feeling of hunger)
What’s another example??
What are a couple of unpleasant internal stimuli that people would rather not experience?
External stimuli:
Changes in an organism’s environment that affect the organism
Examples: light, temperature
How does your skin respond to an external stimuli??

18. copyright cmassengale
6. Homeostasis
An organism’s ability to maintain steady internal conditions when outside conditions change.
Stable internal conditions of pH, temperature, water balance, etc.
copyright cmassengale

19. Homeostasis Homeostasis is a vital function for all organisms.
What could happen if an organism can not maintain homeostasis?

20. Life is Organized on Several Levels
copyright cmassengale

21. copyright cmassengale
Levels
Atoms
Molecules
Organelles
Cells – life starts here
Tissues
Organs
System
Organism
copyright cmassengale

22. copyright cmassengale
Levels
Population
Community
Ecosystem
Biosphere
copyright cmassengale

23. copyright cmassengale