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Biology Chapter 3

9th grade BJU Biology Chapter 3

TermDefinition
biosphere the realm of life on Earth; few kilometers into the atmosphere to few kilometers into the earth's crust
ecology the study of interrelationships between organisms and their relation to their physical surroundings
biodiversity the number of species ("species richness") in an area
biome large area that have fairly consistent environment and is home to a set of organisms suited to it (both biotic and abiotic)
ecosystem limited area (smaller than biome) in which living and nonliving things interact
habitat smaller part of an ecosystem that an organism prefers (where they live)
niche the role of an organism within its habitat (how they live)
abiotic factors nonliving aspects of an ecosystem
biotic factors the living part of the ecosystem
population a group of organisms of the same species interacting in the same area
producer (= autotrophs) plants and algae manufacture their own food by photosynthesis
consumer (= heterotrophs) organisms that can't produce their own food, but instead consume the producers
competition organisms try to use the same resource
detritus waste products of plants and animals
decomposer organisms that break down nutrients
food web overlapping of the food chains of different animals
ecological pyramid each trophic level represents a different type of organism in the food chain, and each depends on the level below it for energy
symbiosis animals interacting with each other
parasitism organisms that depend on a much larger animal, a host, for food (over time they weaken the host)
mutualism a mutually beneficial relationship between several members of an ecological community
commensalism one organism benefiting from another, but other neither benefit nor harmed
neutralism shares neighborhood, but isn't directly affected
amensalism one organism is injured while the other is unaffected
Created by: krisztamod