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Biology Ch. 3

biology questions for chapter 3

TermDefinition
ecology the scientific study of interacting among organisms and their environment
biosphere the part of Earth in which life exists; interactions in the biosphere product a web of interdependence
species a group of organisms so similar to one another that they can breed fertile offspring
populations groups of individuals of a species that live in the same area
communities assemblies of different populations that live together in a defined area
ecosystems collections of all living organisms and nonliving things
biomes groups of ecosystems that have the same climate and similar dominant communities
autotrophs organisms that can use energy from sunlight or chemicals to produce food
photosynthesis the process that uses sunlight to power chemical reactions
chemosynthesis when autotrophs use energy in bonds in inorganic molecules to produce carbohydrates
consumers organisms that rely on other organisms for their energy
decomposers a group of heterotrophs that break down organic matter
food chains series of steps in an ecosystem in which organisms transfer energy by eating and being eaten
food webs links of food chains in an ecosystem
trophic levels steps in a food web or food chain
ecological pyramids diagrams that show the relative amounts of energy or matter contained in each level of a food chain or food web
biomass the amount of living tissue within a given trophic level; usually expressed as grams of organic matter per unit area
biogeochemical a cycle that include biological, chemical, and geological aspects of the biosphere
primary productivity the rate at which organic matter is created by producers
limiting nutrient a nutrient that is in short supply so it will limit an organism’s growth
Created by: NoahBuscher
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