1. What are the life processes by which the life of an organism is maintained? What are the life processes by which the life of an organism is maintained? Life functions

2. Nutrition the taking materials from the external environment and changing them into useful forms (nutrients). 2 types of nutrition:  Autotrophic  Heterotrophic

3. Autotrophic Nutrition: organisms make their own nutrients: photosynthesis organisms make their own nutrients: photosynthesis CO 2 + water + Solar energy Sugar + O 2 CO 2 + water + Solar energy Sugar + O 2

4. Heterotrophic nutrition Organisms cannot make their own nutrients and must find them in their environment. Processes involved: 1.Ingestion: taking in food 2.Digestion: breaking down food 3.Egestion: elimination of indigestible food

5. 2. Transport  the ability to move materials into, out of and throughout an organism  Involves absorption (taking in) and distribution (circulation) of nutrients.

6. 3. Respiration  the ability to convert food into energy  Sugar + O 2 CO 2 + H 2 O + Energy

7. 4. Excretion  Removal of wastes from chemical reactions: (Carbon Dioxide,Water & Urea)

8. 5. Growth The ability to increase in size  Unicellular organisms: cell increases size  Multicellular organisms: the number of cells increases.

9. 6. Reproduction  When an organism produces new organisms of its own kind. 1. Sexual Reproduction: 2 parents, offspring not identical to either parent. Results in variation.

10. 2. Asexual Reproduction: one parent. Offspring identical to the parent

11. Metabolism is the sum total of ALL chemical reactions occurring in an organism to maintain life. Homeostasis is the ability to maintain a balanced, steady-state, internal environment within an organism. Failure to maintain homeostasis leads to illness, disease or even death.