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Chapter Eighteen Notes
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49
Biology
9th Grade
04/01/2014

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Term
What is the study of the interactions between organisms and their environment?
Definition
ecology
Term
What are the levels of biological organization (bottom to top)?
Definition
biosphere, ecosystem, community, population, organism
Term
What is an organism?
Definition
individual living thing
Term
What is a population?
Definition
group of organisms
Term
What is a community?
Definition
population of different species living in the same place at the same time
Term
What is an ecosystem?
Definition
all of the living and nonliving components in a given area
Term
What is a biosphere?
Definition
portion of the Earth that supports life
Term
What are the two factors the biosphere is composed of?
Definition
biotic and abiotic factors
Term
What is biotic?
Definition
all living things (birds, fish, bacteria)
Term
What is abiotic?
Definition
nonliving components of the ecosystem (soil, water, temperature, amount of sunlight)
Term
What is the dwelling place where an organism seeks shelter?
Definition
habitat
Term
What is a habitat?
Definition
an organism's home
Term
What is the role that an organism plays in its community?
Definition
niche
Term
What is a niche?
Definition
an organism's job
Term
How do organisms obtain energy?
Definition
they're either autotrophs or heterotrophs
Term
What's another name for autotrophs?
Definition
producer
Term
What is an autotroph/producer?
Definition
organism that uses sunlight to produce food (plant)
Term
What is another name for Heterotrophs?
Definition
consumers
Term
What is a heterotroph/consumer?
Definition
organism that feeds on other organisms (animals)
Term
What are the three types of heterotrophs?
Definition
herbivore, carnivore, omnivore
Term
What is a predator?
Definition
an organism that feeds on other organisms (the hunter)
Term
What is the model used to show how matter and energy move through an ecosystem?
Definition
food chain
Term
What is the position occupied by an organism in a food chain=feeding steps?
Definition
trophic levels
Term
What are the five types of heterotrophs?
Definition
herbivore, carnivore, omnivore, detritivore, and decomposer
Term
What is a heterotroph that feeds on the "garbage" of the ecosystem?
Definition
detritivore
Term
What is a heterotroph that breaks down dead organic matter?
Definition
decomposer
Term
Where can the transfer of energy from the sun to producer to primary consumer then to higher order consumers be shown?
Definition
in a food chain
Term
What are the five trophic levels?
Definition
primary producers, primary consumers, secondary consumers, tertiary consumers, and quaternary consumers
Term
What is a primary producer?
Definition
organism that makes their own food
Term
What is a primary consumer?
Definition
herbivore
Term
What is a secondary consumer?
Definition
carnivore and omnivore
Term
What do tertiary consumers eat?
Definition
eats secondary consumer
Term
What do quaternary consumers eat?
Definition
eat tertiary consumers
Term
What is another way of showing the transfer of energy in an ecosystem?
Definition
the energy pyramid
Term
About how much of the energy at each level is transferred to the next level?
Definition
about 10%
Term
What are food webs?
Definition
interconnected food chains
Term
What do food webs show?
Definition
the feeding relationships in an ecosystem
Term
What is the water cycle?
Definition
the never ending circulation of water between the atmosphere and the earth
Term
What's it called when plants use carbon dioxide and energy from the sun to perform photosynthesis?
Definition
carbon cycle
Term
When animals eat plants, where does the carbon go?
Definition
it passes into their tissues
Term
How is carbon returned to the earth after death?
Definition
through respiration, excretion, or decomposition
Term
What is the most abundant atmospheric gas?
Definition
nitrogen (78%)
Term
What is the conversion of nitrogen gas into ammonia by several types of bacteria or by lightning?
Definition
nitrogen fixation
Term
What lives on the roots of legumes (peas, beans, peanuts)?
Definition
nitrogen-fixing bacteria
Term
What exists only as part of an organism, dissolved in water, or as an element in rock?
Definition
phosphorus cycle
Term
What produces the main source of oxygen on the earth?
Definition
plants and algae
Term
What do animals require for respiration?
Definition
oxygen
Term
What releases oxygen during photosynthesis?
Definition
plants
Term
What is the order of the energy pyramid from bottom to top?
Definition
producers, first order consumer, second order consumer, third order consumer
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