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Ecology Science Exam

QuestionAnswer
define ecosystem since our planet has many diverse plants and animals scientists tend to study smaller areas called ecosystems
define trophic level different levels of feeding relationships
define bioaccumulation when plants and animals take in water and absorb non-degradable substances. these substances now enter the foodchain.
define nitrogen fixation the process of changing nitrogen into ammonia and nitrites which are soluable in water.
define producer organisms such as plants and algea that get there energy from the sun and produce their own food
define consumer animals are consumers since they can not produce food for themselves they get it from producers
define carnivore (tertiary consumer) feed on meat and secondary consumers
define herbivore (primary consumers) feed directly on plants
define food chain a sequence of organisms through which energy is passed
define decomposer recyclers of the environment, the decomposers are mostly fungi and bacteria
define photosynthesis plants making there own food from water, CO2 and sunlight to produce sugar and energy.
define primary consumer feed directly on plants
define secondary consumer feed on producers
define community a collection of all populations in a particular area at a certain time.
define population group a organisms that belong to the same species in a particular area
define autotroph an organism that can make its own food
define heterotroph an organism deriving it nutritonal requirement from complex organisms
define food web complex relationships of food chains
list abiotic factors physical environment, water and sunlight, non living factors
list biotic factors animals, plants and fungi, living factors that affect the ecosystem
define density dependent things that occur to a population when the ecosystem can not support the size of the population
define density independent natural occurences or human activity
list some producers trees, clover, grass and algae
list some primary consumers rabbit, deer, caterpillars, mice and squirrels
list some secondary consumers fox, hawk and wolf
how much energy is passed through each trophic level 10%
explain why ddt can mean problems for the ecosystem it is non-degradeable so it will take a really long time ti exit the ecosystem once it has entered it
define biological magnification the stroied toxins accumulated by the producers are passed up by there consumers to the top of the food chain
which organism would have the most ddt if it got into the ecosystem
what % of the earths atmoshere is oxygen 21%
specialized bacteria break down nitrogen and release what? nitrates and they are called nitrogen fixing bacteria
how does fossilized carbon re enter the carbon cycle? fossil fuels and combustion
list some human activities that release more carbon into the atmosphere driving, using factories and smoking
.0.
Created by: RyMo
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