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54 Cards in this Set
- Front
- Back
Define Solution
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mixture in which one or more substances (solutes) are disrupted evenly in another substance(solvent)
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Define Data
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Information obtained from existing experiments, sometimes called experimental results.
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Define Community
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collection of several interacting populations that inhabit a common enviroment
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Explain the difference between a stimulus and a responce.
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Stimulus- any condition in an enviroment that requires an organism to adjust.
Responce- An organism's reaction to a change in its internal/ external enviroment. |
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Define Parasitism
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symbiotic relationship in which one organism benefits at the expense of the other species
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Define Biology
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The study of life that seeks to provide an understanding of the natural world.
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Define Control
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in an experiment, the standard in which all of the conditions are kept the same
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Define Fungus
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group of unicellular or multicellular heterotrophic eukaryotes that do not move from place to place; absorb nutrients from organic materials in the enviroment.
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Define Aphotic Zone
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portion of the marine biome that is too deep for sunlight to penetrate.
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Define Niche
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role and position a species has in its enviroment
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Define Covalent Bond
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chemical bond formed when two atoms combine by sharing electrons
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Define Ionic Bond
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chemical bond formed by attractive forces between two ions of opposite charge
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Define Commensalism
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Symbiotic relationship in which one species benefits and the other species in neither harmed nor benefited
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Define Photic Zone
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potion of the marine biome that is shallow enough for light to penetrate.
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Define Conservation Biology
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field of biology that studies methods and implements plans to protect biodiversity
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Define Estuary
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coastal body of water, partially surrounded by land, in which freshwater and salt water mix
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Define Biotic Factors
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all the living organisms that inhabit an enviroment
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Define Exotic Species
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nonnative species in an area; may take over niches of native species in an area and eventually replace them
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Define Carrying Capacity
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number of organisms of one species that an enviroment can support; populations below carrying capacity tend to increase; populations below decrease.
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Define Food Web
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model that expresses all possible feeding relationships at each trophic level in a community
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Define Biosphere
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portion of earth that supports life; extends from atmosphere to bottom of oceans
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Define Mutualism
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a symbiotic relationship in which both species benefit
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Define Atoms
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smallest particle of an element that has the characteristics of that element; basic building block of all matter.
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Define Molecule
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group of atoms held together by covalent bonds; no overall charge
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Define Biogenesis
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idea that living organisms come only from other organisms.
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Define Independant Variable
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in an experiment, the condition that is changed b/c it affects the outcome of the experiment
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Define Compound
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substance composed of atoms of two or more different elements that are chemically combined.
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Define Population
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group of organisms of one species that interbreed and live in the same place at the same time
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Define Autotrophs
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organismsthat use energy from the sun or energy stored in chemical compounds to manufacture their own nutrients
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Define Symbiosis
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permanent, close association between two or more organisms of different species
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Give an example of commensalism
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the cowbird that puts its eggs in other birds nests and the other birds raise the baby cowbird.
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Define Limiting Factor
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any biotic or abiotic factor that restrics the existence, numbers, reproduction, or distribution of organsims
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Define Dependant Variable
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in an experiment, the condition that results from changes in the independant variable.
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Define Food Chain
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simple model that shows how matter and energy move through an ecosystem; can consist of three steps, but must have no more than 5 steps
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Define Algae
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photosynthetis, plantlike, autotrophic protists.
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Define Habitat Defragmentation
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seperation of wilderness areas from eachother; may cause problems for organisms that need large areas for food or mating
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Define Acid Precipitation
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Rain, snow, sleet or fog with a pH below 7; causes deterioration of forests, lakes, statues, and buildings.
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Define Transpiration
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in plants, the loss of water through leaf stomata by evaporation
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Define Density- Dependent Factor
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factor such as disease, parasites or food supply that has an increasing effect as populations increase.
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Define Heterotrophs
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organisms that can't make their own food and must feed on other organisms for energy and nutrients.
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Define Ecology
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scientific study of interactions among organisms and their enviroments
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Define Secondary Succession
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sequence of community changes that take place after a community is disrupted by natural disasters or human actions
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Define Density- independant factor
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factor such as temp., storms, floods, drought, or habitat disruption that affects all populations, regardless of their density.
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Define Mixture
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combination of substances in which individual components do not combine chemically and retain their own properties.
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Define Ecosystem
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interactions among populations in a community; the community's physical surroundings, or abiotic factors
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Define Experiment
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procedure that tests a hypothesis by collecting information under controlled conditions
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Define Element
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substance that can't be broken down into simpler chemical substances
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Define Habitat
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place where an organism lives out its life.
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Define Primary succession
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Colonication of new land that is exposed by avalanches, volcanoes, or glaciers by pioneer organisms
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Define Nucleus
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positively charged center of an atom composed of neutrons and positively charged protons, and surrounded by a cloud of negatively charged electrons
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Define Lichen
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organism formed from a symbiotic association between a fungus, usually an ascomycete, and a photosynthetic green alga or cyanobacteria
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Define Ion
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atom or group of atoms that gain or lose electrons; has a positive or negative eletrical charge
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Define Isotopes
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atoms of the same element that have different numbers of nuetrons in the nucleus.
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Define Trophic Level
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organism in a food chain that represents a feeding step in the passage of energy and materials through an ecosystem
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