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Chapter 4 Vocab
Quiz: February 2011
33
Biology
9th Grade
02/27/2011

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Term
Weather
Definition
Day-to-day conditions of the atmosphere, including temperature, precipitation, and other factors.
Term
Climate
Definition
Average year-to-year conditions of temperature and precipitation in an area over a long period of time.
Term
Micro-climate
Definition
Environmental conditions within a small area that differs significantly from the climate of the surrounding area.
Term
Greenhouse effect
Definition
The process of which certain gases (carbon dioxide, methane, and water vapor) trap sunlight energy in Earth's atmosphere as heat.
Term
Tolorance
Definition
The ability of an organisms to survive and reproduce under circumstances that differ from their optimal conditions.
Term
Habitat
Definition
And area where an organism lives including the biotic and abiotic factors that affect it.
Term
Niche
Definition
Full range of physical and biological conditions in which an organism lives and the way in which the organisms uses those conditions.
Term
Resource
Definition
Any necessity of life.
Term
Competitive exclusion principle
Definition
A principle that states that no two can occupy the same niche in the same habitat at the same time.
Term
Predation
Definition
Interaction is which one organism (the predator) captures and feeds on another organism (the prey)
Term
Herbivory
Definition
Interaction in which one animal (the herbivore) feeds on the producer (such as plants)
Term
Keystone species
Definition
Single species that is not usually abundant in a community yet exerts strong control on the structure of the community.
Term
Symbiosis
Definition
Relationship in which two species live close together.
Term
Mutualism
Definition
Symbiotic relationship in which both species benefit from the relationship.
Term
Parasitism
Definition
Symbiotic relationship in which one organisms lives on or inside another organism and harms it.
Term
Commensalism
Definition
Symbiotic relationship in which one organism benefits and the other is neither helped, nor harmed.
Term
Ecological succession
Definition
Serious of gradual changed that occur in a community following a disturbance.
Term
Primary succession
Definition
Succession that occurs in an area in which no trace of a previous community is present.
Term
Pioneer species
Definition
First species to populate an area during succession.
Term
Secondary succession
Definition
A type of succession that occurs in an area that was only partially destroyed by disturbances.
Term
Canopy
Definition
Dense covering formed by the leafy tops of tall rain forest trees.
Term
Understory
Definition
Layer in a rain forest found underneath the canopy formed by shorter trees and vines.
Term
Deciduous
Definition
Trees that shed its leaves during a particular season of the year.
Term
Coniferous
Definition
Trees that produce sea-bearing cones, and have thin leaves, shaped like needles.
Term
Humus
Definition
Material formed from decaying leaves, and other organic matter.
Term
Taiga/Boreal Forest
Definition
Biome with long cold winters and a few months of warm weather; dominated by coniferous; also called boreal forest.
Term
Permafrost
Definition
Layer of permanently frozen subsoil found in the tundra.
Term
Photic zone
Definition
Sunlight region near the surface of water.
Term
Aphotic zone
Definition
Dark layer of the oceans below the photic zone, where sunlight does NOT penetrate.
Term
Benthos
Definition
Organisms that live attached to or near the bottoms of lakes, stream, or oceans.
Term
Plankton
Definition
Microscopic organisms that live in aquatic environments.
Term
Wetland
Definition
An ecosystem in which water either covers the soil or is present at or near the surface for at least part of the year.
Term
Estuary
Definition
A kind of wetland formed where a river meets the ocean.
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