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56 Cards in this Set

  • Front
  • Back
ecology
the science of the relationship between organisms and their environment
organism
an idividual form of life, such as a plant, animal, bacterium, protist or fungus
species
a fundamental category of taxonomic classification, ranking below a genus or subgenus and consiting of related organisms capable of interbreeding
natural capital
indispensable resources and benefits, essential for human survival and economic activity, provided by the ecosystem (renewable/non-renewable)
population
all the organisms that consitute a specific group or occur in a specified habitat
habitat
the area or environment where an organism or ecological community normally lives or occurs
community
an assemblage of interacting populations occupying a given area
ecosystem
an ecological community together with its environment, functioning as a unit
biosphere
the part of the earth and its atmosphere in which living organisms exist or that is capable of supporting life
atmosphere
the gaseous mass or envelope surrounding a celestial body, especially the one surrounding the earth, and retained by the celestial body's gravitational field
lithosphere
the outer part of the earth, consisting of the crust and upper mantle, approximately 100 km thick
hydrosphere
the waters of the earth's surface as distinguished from those of the lithosphere and the atmosphere
solar capital
solar energy from the sun reaching the earth
natural greenhouse effect
keeps the earth's climate warm and inhabitable
biomes
major regional or global biotic communities, such as grasslands or deserts, characterized chiefly by the dominant forms of life and the prevailing climate (temperature and precipitation)
abiotic/biotic
non-living/living components of an ecosystem
range of tolerance
how much an organism can take and still exist (temperature extremes, pressure changes, rainfall, pH, light levels); conditions for survival
limiting factor principal
one variable that can destroy an organism or population no matter how well the other variables are going
producers/autotrophs
create their own food through photosynthesis or chemosynthesis; plants, some bacteria
photosynthesis
the process of creating food (glucose) and oxygen out of solar energy, water and carbon dioxidet
chemosynthesis
synthesis or carbohydrates from carbon dioxide and water using energy obtained from the chemical oxidation of simple inorganic compounds (bacteria/fungi)
consumers/heterotrophs
organisms that cannot synthesize their own food and are dependent on complex organic substances for nutrition (omnivores/carnivores/herbivores/detritovores)
omnivores
eat what is available, plants and animals
detritovores
eat exclusively dead things, scavengers (feed on detritus or organic waste)
aerobic/anaerobic respiration
in the presence of oxygen/needless of the presence of oxygen
biodiversity
variability among living organisms on the earth or specified geographic region
trophic level
group of organisms that occupy the same position in a food chain
ecological efficiency
the ability of organisms at one trophic level to convert to their own use the potential energy supplied by their foodstuff at the trophic level directly beneath them
gross primary productivity
rate at which an ecosystem's producers capture and store a given amount of chemical energy as biomass in a given length of time
net primary productivity
GPP minus respiration (the rate at which all the plants in an ecosystem produce net useful chemical energy)
weathering
any of the chemical or mechanical processes by which rocks exposed to the weather undergo changes in character and break down
soil horizons
layers of soil
soil profile
cross-section of soil, diagram
humus
mineral-rich soil, darkens soil, highly nutritious, organic material
infiltration
the action of water entering soil
leaching
natural process by which water soluble substances (such as calcium, fertilizers, pesticides) are washed out from soil or wastes, causing pollution
soil texture
measurement of the proportion of mineral particles of different sizes that are found in the same sample of soil (sand, silt, clay)
loam
soil composed of a mixture of sand, clay, silt and organic matter
porosity
the volume of water that can be held in a soil; also refers to the ratio of the volume of voids to the total volume of the soil
permeability
the rate of flow of a liquid or gas through a porous material
What are nutrient cycles called?
biogeochemical cycles
What are the five most common kinds?
hydrologic, nitrogen, phosphorous, sulfur, carbon
What are the four most important elements?
carbon, phosphorous, sulfur, nitrogen
C-Atmosphere, CO2
hydrologic, dissolved carbonates; sedimentary, fossil fuels
N2-Atmosphere
hydrologic, dissolved ammonium and nitrates
P-Sedimentary, PO4
hydrologic, dissolved phosphates
S-Sedimentary, SO4
atmospheric, sulfates, sulfur oxides, sulfuric acid; hydrologic, dissolved sulfates and sulfuric acid
What is the energy flow through trophic levels?
producers (autotrophs)-->primary consumers (herbivores)-->secondary consumers (carnivores/omnivores)-->tertiary consumers (top carnivores/omnivores)
How can organisms move from one trophic level to another?
by eating different types of things
What will cause plants and animals to exist and thrive?
the more sunlight and water
How much energy is lost to the environment in energy flow?
90%
What are the three interconnected parts of the biosphere?
hydrosphere, lithosphere, atmosphere
What are the three parts of matter or nutrient recycling?
plant growth (photosynthesis), animal consumption (respiration), nutrient recycling (decomposition)
What are the levels of organization?
organisms-->populations-->communities-->ecosystems-->biospheres
What are the differences between a prokaryotic and a eukaryotic cell?
prokaryotic has flagellum, nucleoid, more basic; eukaryotic has mitochondria, nucleus, nucleolis, etc.
What are the two main things that determine biome type?
temperature and precipitation