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Goal 2.1.1
Lessons 14, 15, 18 Ecology: Food chains, food webs)
35
Biology
10th Grade
01/03/2013

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Term
Ecosystem
Definition
the sum of all the living and nonliving things in an area and the interactions among them.
Term
producer
Definition
organisms that capture energy and convert it into chemical energy stored in the chemical bonds of glucose and other simple food molecules.
Term
consumer
Definition
organisms that obtain their energy by eating other organisms.
Term
primary consumer
Definition
rabbits, cardinals, and white-tailed deer, consumers that eat producers.
Term
secondary consumer
Definition
river otters, red-tailed hawks, and great blue herons, eat primary consumers.
Term
decomposers
Definition
organisms that obtain energy from organic wastes, such as fallen leaves or dead organisms.
Term
food chain
Definition
the path of food and energy from producer to consumer to decomposer.
Term
food web
Definition
food chains that interconnect through multiple feeding relationships.
Term
trophic level
Definition
each feeding level in an ecosystem.
Term
herbivores
Definition
consumers such as rabbits and cows, which eat only or mostly plants or plant products.
Term
carnivores
Definition
eat only or mostly other consumers.
Term
omnivores
Definition
eat both plants and animals.
Term
energy pyramids
Definition
show the energy loss between trophic levels in an ecosystem.
Term
biomass
Definition
all living matter in a habitat, trophic level, or ecosystem.
Term
model
Definition
representation of an object, system, or process.
Term
carbon-oxygen cycle
Definition
The continuous transfer of carbon and oxygen between Earth's living organisms and the nonliving parts of the environment.
Term
nitrogen cycle
Definition
the continuous movement of nitrogen among Earth's organisms, waters, rocks, minerals, and atmosphere.
Term
nitrogen fixation
Definition
a process in which certain soil bacteria break down nitrogen gas from the atmosphere and covert it into a form that plants can use.
Term
denitrification
Definition
bacteria convert nitrogen compounds into nitrogen gas.
Term
water cycle
Definition
the continuous circulation of water among Earth's organisms, atmosphere, and surface.
Term
evaporation
Definition
the change of a liquid to a gas at the surface of the liquid.
Term
transpiration
Definition
the release of water vapor through the stomata, or openings, in a plant's leaves.
Term
condensation
Definition
the process in which a gas changes to a liquid when it loses thermal energy.
Term
precipitation
Definition
water that falls from the atmosphere to Earth as rain, snow, sleet, or hail.
Term
biodiversity
Definition
refers to the number of different kinds or organisms living on Earth or in an ecosystem.
Term
natural resource
Definition
a part or product of the environment that is used by humans or other organisms.
Term
deforestation
Definition
the removal of all the trees in an area of forest.
Term
keystone species
Definition
species that plays a critical role in the community structure of an ecosystem.
Term
pollution
Definition
the release of harmful substances or energy into air, soil, or water.
Term
global warming
Definition
an increase in average atmospheric temperatures around the world.
Term
acid rain
Definition
rain that has a pH lower that 5.6.
Term
eutrophication
Definition
occurs when excess nutrients are released into a body of water.
Term
pesticides
Definition
chemicals that are designed or used to kill pest animals, such as certain insects and rodents.
Term
bioaccumulation
Definition
an increase in the amount of a substance, such as pesticide, in the tissue of an organism.
Term
extinction
Definition
the permanent dying out of a species or population.
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