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1-3: What are the needs of organisms? Key Terms autotroph – an organism that can make its own food heterotroph – an organism that cannot make its own food.

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Presentation on theme: "1-3: What are the needs of organisms? Key Terms autotroph – an organism that can make its own food heterotroph – an organism that cannot make its own food."— Presentation transcript:

1 1-3: What are the needs of organisms? Key Terms autotroph – an organism that can make its own food heterotroph – an organism that cannot make its own food homeostasis – process of keeping conditions inside a body constant, no matter the conditions outside the body

2 Energy All organisms need energy to grow. Some organisms can make their own foods; they are called autotrophs. A plant is an example of an autotroph. Other organisms cannot make their own food. They rely on other sources to get their food supply. Humans are heterotrophic organisms.

3 Water All organisms need water; without it, they will die. Plants use water to make food. Many substances will dissolve in water and these substances can then be transported throughout a living thing. Most chemical changes need water in order to take place.

4 Air Without oxygen (O 2 ), many living things would die in minutes. Oxygen (O 2 ) is needed by most things to change food into energy. Land animals get oxygen from the air; water animals get oxygen from the water (oxygen is dissolved in the water). Carbon dioxide (CO 2 ) is also a gas found in air. Animals release carbon dioxide when they breathe; plants use carbon dioxide to make their own food.

5 Temperature All organisms require a constant and proper temperature in order to live. Homeostasis is the process of keeping conditions inside an organism constant, no matter the conditions outside the organism. Cold-blooded animals do not have a constant body temperature; its body temperature changes as the surroundings change. When the animal gets cold, it needs to warm itself; when it gets hot, it needs to cool itself down. Warm-blooded animals have a constant body temperature. When the temperature in the environment changes, a warm-blooded animal’s body temperature stays about the same.

6 Living Space All organisms need a place to live and this space must provide all of its needs. Needs include: food, water, air and shelter. The living environment also has to have proper temperature in order for the organism to thrive and survive. All organisms compete for resources in their living space.


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