LIFE ACTIVITIES/ CHAPTER 2

Life Science is the study of living things and their life activities.

The life activities are:

1. MOVEMENT

2. TAKING IN AND USING FOOD

3. TAKING IN AND USING OXYGEN

4. GETTING RID OF WASTES

5. RESPONDING TO CHANGES AROUND THEM

6. REPRODUCTION

1. MOVEMENT CAN HELP AN ORGANISM TO SURVIVE.

A. ANIMALS MUST GET THEIR FOOD FROM OTHER ORGANISMS.

B. ALLOWS PLANTS ROOTS TO GROW DOWNWARD AND TOWARD WATER.

C. STEMS AND LEAVES TO GROW TOWARD SUNLIGHT.

2. TAKING IN AND USING FOOD AS A FUEL

A. ANIMALS MUST GET THEIR FOOD FROM OTHER ORGANISMS.

B. GREEN PLANTS HAVE THE ABILITY TO MAKE THEIR OWN FOOD (FROM WATER, CARBON DIOXIDE DURING DAYLIGHT)

C. FOOD IS USED BY THE ORGANISM TO GROW, AND TO REPAIR WORN PARTS.

3. TAKING IN AND USING OXYGEN (O₂₎

A. ANIMALS NEED O₂TO OXIDIZE (COMBINE WITH OR BURN) FOOD. (ALL THE TIME)

B. PLANTS NEED O₂ TO OXIDIZE THE FOOD THEY MAKE. (ALL THE TIME)

C. WHEN YOUR BODY OXIDIZES FOOD IT GETS ENERGY.

4. GETTING RID OF WASTES

A. A WASTE MATERIAL IS ANYTHING THAT AN ORGANISM HAS NO USE FOR.

B. IF AN ORGANISM CANNOT GET RID OF WASTE, THE WASTES WILL ACCUMULATE AND POISON THE ORGANISM.

C. EXCRETION REFERS TO WASTES THAT WERE MANUFACTURED BY THE BODY CELLS

D. ELIMINATION REFERS TO WASTES FROM MATERIALS COMING FROM A FOOD SOURCE.

5. RESPONDING TO CHANGES IN IT’S ENVIRONMENT

A. A STIMULUS IS A CHANGE THAT’S MADE IN THE ENVIRONMENT. (EX. LOUD CRASH)

B. A RESPONSE IS THE REACTION TO THAT STIMULUS. (EX. JUMP WHEN YOU HEAR IT)

C. AN ENVIRONMENT IS YOUR SURROUNDINGS.

6. REPRODUCTION AND GROWTH

A. REPRODUCTION PRODUCES ORGANISMS OF THE SAME KIND. (ONE LIFE ACTIVITY NOT ESSENTIAL FOR SURVIVAL)

B. LIVING ORGANISMS HAVE A DEFINITE SIZE AND SHAPE BUT CAN STILL GROW AND GET LARGER.

LIVING THINGS NEED TO SURVIVE:

1. ENERGY

2. FOOD AND WATER

3. OXYGEN

4. LIVING SPACE

ABILITY TO MAINTAIN A FAIRLY CONSTANT BODY TEMPERATURE

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