ISCI 173 Exam 3 || QUESTIONS WITH ALL PASSED ANSWERS.
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Module
ISCI 173
Institution
ISCI 173
What is an ecosystem? correct answers A community of different species interacting with one another and with their non-living environment of matter and energy.
What are the 3 basic components of an ecosystem? correct answers Autotrophs, consumers, abiotic matter
What is Ecology? correct answe...
ISCI 173 Exam 3 || QUESTIONS WITH ALL PASSED
ANSWERS.
What is an ecosystem? correct answers A community of different species interacting with one
another and with their non-living environment of matter and energy.
What are the 3 basic components of an ecosystem? correct answers Autotrophs, consumers,
abiotic matter
What is Ecology? correct answers the study of relationships between organisms and their
environment.
What is a habitat? correct answers the space in which an organism lives; it is defined by the
biological requirements of each particular organism. (HOME)
What is a niche? correct answers the functional role on organism has in its surroundings.
(JOB)
What is a population? correct answers includes all organisms of the same species kind found
within a specific geographic region.
What is a species? correct answers All of the organism potentially capable of interbreeding
and having viable offspring
What is a community? correct answers Includes all of the plant and animal populations in a
specific geographic region. (more complex=more stable)
What are abiotic factors? correct answers non-living components
How is diversity measured? correct answers Species richness: how many species are present
Species evenness: the distribution of individuals among the species present
What is a keystone species? correct answers A species on which other species in an
ecosystem largely depend; plays a critical role in the maintenance of a specific ecosystem
How are communities defined? correct answers Patterns
These patterns are shown through: species interaction, nutrient availability, disturbances,
energy flow, and evolution
What is scale? correct answers the size of a community
Define and give an example of the 3 different spatial structures correct answers Clumped:
Organisms are clustered in groups. Ex: Fish
Random: Organisms are distributed in unpredictable ways. Ex: Oak Trees
Uniform: Organisms are evenly spaced over the area they occupy. Ex: A Keystone species,
like otters
What is predation? correct answers A kind of species interaction in which one animals
kills/eats another organism
, What is competition? correct answers A kind of species interaction in which two organisms
strive to obtain the same limited resource.
What is the difference between interspecific and infraspecific competition? correct answers
Inter: between or among different species
Intra: within a species
What is symbiosis? correct answers A close, long-lasting, physical relationship between 2
different species. At least on species derives benefits from the interaction
What are the 3 types of symbiosis? correct answers Parasitism: parasite benefits, host is hurt
Commensalism: one species benefits, the other is neither hurt or helped
Mutualism: both species benefit
Matter _____, Energy ______. correct answers Matter CYCLES, Energy FLOWS
What is the water cycle? correct answers Water evaporates, becomes a cloud in condensation,
falls down to earth in precipitin, repeat
What is the Carbon cycle? correct answers plants take carbon dioxide from the air, plants use
it to make food, animals eat the food, carbon is stored or released as CO2
What is the Nitrogen cycle? correct answers Nitrogen Fixation, nitrification, denitrification
What is the Phosphorus cycle? correct answers rain and weathering causes rocks to release
phosphate. This inorganic phosphate is then distributed in soil and water, plants take up
inorganic phosphate from the soil. (No atmospheric component)
How to Humans impact nutrient cycles? correct answers Burning fossil fuels results in more
carbon dioxide
Converting forests results in more carbon dioxide
Fertilization problems results with nitrogen and phosphate in aquatic ecosystems
What is ecological succession? correct answers a series of regular, predictable changes in
community structure.
Difference between Primary and secondary succession correct answers Primary: community
is est. where there was no soil
Secondary: new community is developed where there once was soil
What is a climax community? correct answers the end result of succession. Most important
climate variables: temperature and rainfall
Tropical Dry Forest correct answers consistant temperature, extreme dry periods, high human
impact.
Temperate Grassland correct answers fire plays major role, hot summers, maintained by
disturbances
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