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Study of the interactions between living things & the environment
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Any non-living part of the environment
Light
Temperature
Water
Soil & Minerals
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Any living part of the environment
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| List the levels of ecological organization |
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Organism
Population
Community
Ecosystem
Bioshpere
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A group of organism’s living in the same area
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All the populations living in the same area
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All the interactions between populations and communites
Both biotic & abiotic factors
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All parts of the Earth that support life
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What is the ultimate source of energy?
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Primary Producer = Autotroph
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Must get food from other organisms
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Breaks down the bodies of dead organisms, a recycler
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Shows how energy moves through an ecosystem
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| Describe four points of the food chain. |
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1. Begin with energy from sun
2. Plant are always the first level
3. Usually 4-5 levels
4. All levels connect to decomposers
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Tracks the amount of energy found at each trophic level of a food web
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| What happens to energy as it moves from level in the food chain to the next? |
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Energy is lost as it moves from level in teh food chain to the next.
Only abuot 10% of the energy from one level moves onto the next. |
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Shows all possible feeding relationships
Links many food chains
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1. Biomass = amount of organic matter
2. Since energy decreases, total mass of living things at each trophic level also decreases
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| return nutrients to the soil after creatures die |
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| Describe the Carbon Cycle |
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Found naturally in atmosphere as CO2
Photosynthesis
Respiration
Decay & Fossil fuels
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| What are the stages of the water cycle. |
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Evaporation
Precipitation
Transpiration
Run off
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The parts of earth where life exists
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| Ultimate source of energy? |
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| Two ways producers make food - |
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PHOTOSYNTHESIS –
Use light energy to produce food
CHEMOSYNTHESIS –
use chemical energy to produce food
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Feed on detritus and decomposers
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Matter must be recycled to be available for the next generation.
Nutrients are moved around in biogeochemical cycles |
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If an essential nutrient is missing, productivity will decrease.
N is often the limiting nutrient in aquatic ecosystems
Farmers try to solve this problem with fertilizers |
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