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Cat 4 Unit Vocab

Category 4 Organisms & Environment Unit Vocabulary

TermDefinition
Abiotic factor A nonliving part of an ecosystem.
Adaptation A characteristic that helps an organism survive and reproduce in its natural environment.
Biodiversity the variety of life in a particular habitat or ecosystem.
Biotic factor Anything living in an ecosystem.
Carnivore An animal that eats only meat from other animals.
Catastrophic event A disastrous event, natural or man-made that causes widespread damage or death.
Climax community A community that exists in equilibrium and will not change drastically unless it is disturbed.
Community All the different organisms (populations) that live together in an area.
Competition Occurs when more than one individual or population tries to make use of the same resource.
Consumer An organism that cannot make its own food so it obtains energy by feeding on other organisms.
Decomposers An organism that breaks down dead organisms to recycle nutrients back into the environment.
Ecosystem All the living and nonliving things that interact in an area.
Energy pyramid A diagram that shows the amount of energy transferred from one feeding level to another in a food chain.
Environment The surroundings of an organism.
Food chain A series of events in which one organism eats another.
Food web The pattern of overlapping food chains in an ecosystem.
Habitat The place where an organism lives that provides the things the organism needs.
Herbivore An animal that eats only plants.
Light Quantity The amount of sunlight in an area that reaches the ground.
Limiting factors Resources which may limit the number of organisms supported by an ecosystem.
Long-term environmental change Change in an ecosystem6024 such as an ice age, deforestation, urbanization, Earth’s orbit, Sun’s intensity, global Warming, or radioactive waste/pollution that affects the survivability of an organism. Can last decades or longer.
Mutations Random changes in genes that cause variations that can be helpful or harmful.
Natural selection The process by which organisms best adapted to their environment survive & reproduce to pass on favorable traits to their offspring.
Niche An organism’s particular role in an ecosystem.
nutrients Food or any nourishing substance required by organisms to live and grow.
Omnivore An animal that eats both plants and animals.
Organism Any living thing.
Population All of the organisms of the same species that live in area at the same time.
Primary Consumer An animal that eats plants in a food chain – an herbivore.
Producer An organism that can make its own food, usually by converting sunlight into glucose (sugar).
Resources Biotic and abiotic factors that an organism needs in order to survive.
Scarce Restricted in quantity
Secondary Consumer An organism that feeds on herbivores in a food chain.
Short-term environmental change Change in an ecosystem such as drought, smog, flooding, volcanic eruption, blizzards, and pollution that affects the survivability of an organism. Only lasts from hours to a few years.
Space An area where an organism lives and competes for biotic and abiotic factors.
Species A group of similar organisms that can mate with one another and produce fertile offspring.
Temperature Range The difference between the average high temperature and average low temperature.
Tertiary Consumer A predator that eats another animal in a food chain.
Tolerance ability of an organism to endure unfavorable environmental conditions
Created by: david.sites
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