1. Characteristics of life
Objectives:
Identify the characteristics of life
Differ between living and non-living
Define the basic life functions of an organism

2. DO NOW: Living or Non-living? Why?

3. Characteristics of Living Things
Composed of cells
Use Energy
Growth- development
Respond to change in environment
Reproduce
Maintain Homeostasis

4. What do ALL living things need to survive?
Water
Plants and animals can’t survive without it.
Used for transport materials through living things
Needed to carry out chemical changes
Energy
All energy comes from the sun.
All organisms need energy
Living space
Includes air, water, sunlight, food, and shelter
Organisms need living space to survive
Organisms compete for living space

5. Every living organism needs to perform certain functions to stay alive
Life Functions
Every living organism needs to perform certain functions to stay alive
This is called Homeostasis

6. MR STRaNGER M – Metabolism R - Respiration S – Synthesis T – Transport
R – Regulation a
N – Nutrition
G – Growth and repair
E – Excretion
R - Reproduction

7. Respiration
The process by which oxygen is combined with nutrients to supply energy.
Aerobic Respiration – Organisms that use oxygen to release energy from nutrients
Anaerobic Respiration – Organisms that do not use oxygen (Bacteria, fungus)
Respiration is NOT BREATHING! Breathing is the mechanical movement of air in and out.

8. Synthesis
Build molecules needed
for chemical reactions.

9. Transportation The process of movement.
Including movement of materials
Inside the organism.
Ex. Our circulatory system
transports blood and nutrients
throughout our body.

10. Regulation Keeping levels constant within the organism,
maintaining the right amounts.
Ex: Sweat when too hot,
shiver when too cold.

11. Nutrition The taking in of nutrients (ingestion)
And breaking them down (digestion)
for energy
Autotrophs and Heterotrophs

12. Autotrophs / Heterotrophs
Autotrophs – organisms that can make their own food.
Ex. Plants
Heterotrophs – Organisms that get food from other organisms.
Ex. Animals

13. The ability to increase in size and heal.
Growth and Repair
The ability to increase in size and heal.

14. Excretion
The process by which waste products produced by an organism are removed or eliminated.

15. The process by which organisms generate others of the same kind.
Reproduction
The process by which organisms generate others of the same kind.
Reproduction is not necessary for each organism, but is needed for the continuation and survival of the species.

16. The sum of all life functions =
METABOLISM
Metabolism – all the chemical activities an organism must carry on to sustain life.

17. Practice Questions
_____ is the life function that involves releasing energy from food using oxygen.
a. reproduction b. respiration c. nutrition d. transport
Which life function is not necessary for the survival of the individual?
a. excretion b. response to stimuli c. reproduction d. growth
The sum of all life functions is ______?
a. respiration b. synthesis c. Regulation d. metabolism

18. What are the life functions every organism needs to perform.
____________________________________