OBJECTIVE : After completing this unit, we will be able to :
Name and describe energy roles that organisms play in an ecosystem
Explain how energy moves through an ecosystem
ENERGY FLOW IN ECOSYSTEMS
Abiotic factor: Non-living things into the ecosystem, affecting the life of organisms. Examples: air, light, water, and temperature. Abiotic factors can be harmful to the environment. (sulphur dioxide emissions produce acid rain)
Biotic factor: All living things into an ecosystem. Any living component that affects another organism. Include animals which consume the organism in question, and the living food that the organism consumes.
P r o d u c e r s Energy mostly enters to the world as sunlight and producers capture it to turn it into food molecules in a process called photosynthesis. They are: plants, algaes and bacteria. Producers are the source of all the food in an ecosystem A producer can make its own food
Flowers capture the sunlight for Photosyntesis
Consumers cannot make their own food.
Consumers obtain energy by feeding on other organisms.
Consumers are classified by what they eat : Herbivores Carnivores Omnivores
Do they eat “ Potatoes ” ? ? ? ?
Also known as HERBIVORES , such as: mice, deer, cows, and elephants
Herbivores eat ONLY PLANTS
Are CARNIVORES – they eat only animals
If the animal must be killed before it is eaten, the secondary consumer is known as a predator.
However, sometimes the animals does not have to be killed to be eaten.
O m n i v o r e s
they eat Both : Plants and Animals
Feeds on the bodies of dead organisms
Decomposers Break down wastes and dead organisms, and so complete the cycle by returning nutrients to the ecosystem. (to the soil or water and carbon dioxide to the air and water)