Presentation on theme: "1-3: What are the needs of organisms?"— Presentation transcript:
1 1-3: What are the needs of organisms? Key Termsautotroph – an organism that can make its own foodheterotroph – an organism that cannot make its own foodhomeostasis – 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 (O2), many living things would die in minutes. Oxygen (O2) 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 (CO2) is also a gas found in air. Animals release carbon dioxide when they breathe; plants use carbon dioxide to make their own food.
5 TemperatureAll 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 SpaceAll 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.