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Chapter 2: Living
Transcript of Chapter 2: Living
Producer: Organism that makes its own food.
Consumer: Organism that eats plants or other organisms to obtain energy.
Chapter 2: Food Chains and Food Webs
Decomposers and Scavengers
Scavengers: Eat animals that have recently been killed (ex: vultures, crows)
Decomposers: Break down and feed on dead organisms and waste to obtain energy
Example: tiny bacteria, mushrooms, worms
Life on Earth depends on energy from the sun.
Through photosynthesis, plants store chemical energy. This energy is then passed on to consumers that feed on plants. This makes producers the first step in any energy pathway.
A food chain shows the path of energy flowing from one organism to another.
The arrows between organisms mean " gives energy to" or "is eaten by".
Food chains end with decomposers, as they break down important nutrients from dead organisms. Producers use these nutrients to keep food chains going.
How does energy flow through living things?
I can classify organisms based on their role in a food chain or food web.
Classify organisms as producers consumers, scavengers, or decomposers according to their role in a food chain or food web.
Herbivores (plant eaters)= mice, rabbits, caterpillars
Carnivores (meat eaters)= wolves, snakes, hawks, spiders
Omnivores (plant and meat eaters)= humans, bears, pigs, otters
Examples: green plants, algae
Green plants use sunlight to make sugar called glucose, which contains stored chemical energy. This process is called Photosynthesis.
What did you eat for dinner last night?
Draw a food chain to represent your dinner.
Label the producers and consumers in your chain.
A food chain does not show all the ways organisms in an environment interact to get energy.
A food chain describes only one path that energy can take.
Do you eat only one kind of food? Each thing you eat has its own food chain.
A food web is a diagram of several food chains connected together.
Consumer: grasshopper, mouse, snake