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Living things need energy
Lesson 1-4
19
Science
4th Grade
10/22/2013

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Term
Photosynthesis
Definition
The process by which plants turn sunlight into food.
Usually takes place in the summer.
Term
Solar Energy
Definition
Energy that comes from the Sun. Most plants rely on solar energy to grow.
Term
Environment
Definition
All the living and nonliving things that surround an organism. Plants need an Environment in which they can get sunlight, water, carbon monoxide, and other nutrients.
Term
Biomass
Definition
A measure of the amount of living things in an environment. Plants make up most of the biomass in many environments.
Term
Food Chain
Definition
The path that energy takes from one organism to another in form if food. A food chain shows how energy goes from the Sun to a plant to an insect to a bird.
Term
Producer
Definition
An organism that makes its own food. Green plants are producers that make there own food from water, carbon dioxide, and sunlight.
Term
Consumer
Definition
An organism that eats other organisms. Consumers cannot make their own food.
Term
Decomposer
Definition
An organism that breaks down other organisms. Decomposers return an organism's nutrients to the soil.
Term
Herbivore
Definition
An animal that eats mainly plants. Deer, rabbits, and cows are all herbivores.
Term
Carnivore
Definition
An animal that eats other animals. Hawks that eat mice are carnivores.
Term
Omnivore
Definition
An animal that eats both plants and animals. Most humans are omnivores.
Term
Food Web
Definition
The food chains that link together in the environment. A food web shows that some animals are part of more than one food chain.
Term
Competition
Definition
The struggle among living things for the same resources. There is a great competition for mice as food in a woodland food chain.
Term
Population
Definition
All the members of a single type of living thing in an environment. *When one population changes, it affects other populations in the same food web.
Term
Energy Pyramid
Definition
A diagram that shows the amount of energy at each level of the food web in an ecosystem.*Humans are usually at the top of the energy pyramid and insects are near the bottom.
Term
Microorganism
Definition
An organism that is too small to see without a microscope. *Protists and bacteria are microorganisms.
Term
Bacteria
Definition
Microorganisms that have cell membranes but no nuclei. *Bacteria can be both helpful and harmful to humans.
Term
Protist
Definition
A microorganism that lives in the water. *Many harmful Protists are found in ponds and lakes.
Term
Fungi
Definition
A plant-like organism that breaks down dead or dying plants. *Fungi are one type of decomposers in a woodland environment.
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