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39 Cards in this Set

  • Front
  • Back
In 1866, the German biologist Ernst Haeckel named the study of how organisms fit into their environment, calling it
A typical ecosystem might include
large and small animals, microscopic eukaryotes, birds, trees and flowers
What is the source of the carbon in fossil fuels?
shells of marine organisms
The algae in the
figure are
The krill in the
figure are
The figure is called
a food chain
organisms that obtain their energy from organic wastes and dead bodies
animals at the second trophic level that eat plants
The most likely
reason that the
figure has only 5
levels is that
too much energy is lost at each level to permit more levels
The process of succession varies depending on
initial environmental conditions and chance.
Nagy Chapter 17
Study and cut apart
The study of the interactioins of living organisms with one another and with their physical environment is called
The many species that live together in a habitat is called
a community and all the physical aspects of its habitiat is called
The conversion of nitrate to nitrogen gas is called
plants that are the first organisms to live in a new habitat
pioneer species
organisms that obtain their energy from organic wastes and dead bodies
trophic levels
The place where a particular population of a species lives is called
animals at the third trophic level that eat other animals
animals that eat both plants and animals
bacteria and fungi that cause decay
Biodiversity is the number of species
living within an organism
a linear path of energy through the trophic levels of an ecosystem
food chain
complex, interconnected paths of energy exchanges in an ecosystem
food web
The physical aspects, or _____________ of an ecosystem's habitat include soil, water and weather
abiotic factors
When succession occurs in areas where previous growth has occurred, it is called
secondary succession
In a(n) __________ ____________, the amount of energy stored at each level determines the width of each block.
energy pyramid
The amount of energy in a trophic level iis more accurately determined by measuring the _____ (dry weight of tissue) than the __________ of organisms
__________ ____________ is the process of combining nitrogen gas with hydrogen to form ammonia
nitrogen fixation
_____________ is the production of of ammonia by bacteria during the deay of nitrogen-cntaining urea.
What components are included in an ecosystem but not a community?
abiotic (physical) factors- soil, water, climate and temperature
Why are both bacteria and fungi important organisms in an ecosystem?
They are both decomposers.
Why are the producers an essential component of an ecosystem?
They provide an energy entry point
Why are energy pyramids never inverted?
90% of energy is lost as you move up a level
Trace the cycling of water between the atmosphere and Earth
evaporation, transpiration, water vapor, precipitation, ground water, run off
In the living portion of the water cycle, water
is taken up by the roots of the plants
The plants that first grow on an island formed by a volcano are part of a progresssion called
primary succession
List the four stages of the nitrogen cycle
assimilation, ammonification, nutrification, denitrification
How do living
organisms in the
figure return carbon
atoms to the pool of
carbon dioxide in the
atmosphere and water?
respiration and decomposition