science mid-term exam definitions
Terms
undefined, object
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- consumer
- orginism that gets its energy by eating other orginisms; heterotroph
- experimental group
- to test a hypothesis-- was is changed
- abiotic factors
- nonliving parts of an ecosystem
- non-metal
- brittle-- poor conductor; insulator
- metals
- ductile; malleable--conduct energy well
- biotic factors
- living parts of an ecosystem
- independent variable
- cause
- radiation
- energy passed in rays
- control group
- constant factor used in an experiment to test a hypothesis-- compare to
- dependent variable
- effect
- 3rd law of thermodynamics
- for motion in molecules to stop you must reach absolute zero
- habitat
- place where an orginism lives
- heat
- molecular movement
- metalloid
- hybrid
- absolute zero
- all molecules stop moveing; 0 degrees kelvin
- ecosystem
- all living orginisms in a certain area as well as their physical environment
- particulate matter
- dust, dirt
- niche
- an orginisms way of life
- brownian motion
- more movement you have = more energy that is given off
- trophic level
- a step in the transfer of energy through an ecosystem; the level of a food chain that an orginism occupies
- water cycle
- the continual process by which water circulates between the atmosphere and earth
- temperature
- measurement of heat
- law of conservation of matter
- matter can neitehr be created nor destroyed
- convection
- energy passed in currents
- producer
- an orginism that makes its own food; autotroph
- nitrogen fixation
- bacteria that conert nitrogen gas from from the atmosphere into a form that plants can use
- photosynthesis
- light into sugar; 6CO(2) + 6H(2)O + light = C(6)H912)O(6) + 6O(2)
- conduction
- energy passed through contact
- carbon cycle
- process in an ecosystem in which producers take in carbon dioxide from the atmosphere durin photosynthesis and consumers, having eaten producers, release carbon into the atmosphere as carbon dioxide
- nitrogen cycle
- process by which atmospheric nitrogen is converted into compounds for use by plants and animals, eventually returned by decay
- greenhouse gases
- water, methane, carbondioxide
- cellular respiration
- process of breaking down food to yeild energy; C(6)H(12)O(6) + 6O(2) = 6CO(2) + 6H)2)O + atp