Populations And Communities Part 1 Question Preview (ID: 23765)
Part 1.
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The struggle between organisms to survive as they attempt to use the same limited resource.
a) adaptations
b) predation
c) mutualism
d) competition
All the members of one species in a particular area.
a) community
b) mutualism
c) population
d) predation
The nonliving parts of an ecosystem.
a) abiotic factors
b) biotic factors
c) limiting factors
d) predation
A symbiotic relationship in which both species benefit.
a) commensalism
b) mutualism
c) parasitism
d) predation
The largest population that an environment can support.
a) limiting factor
b) comunity
c) carrying capacity
d) adaptation
The community of organisms that live in an area, along with their nonliving surroundings.
a) community
b) population
c) species
d) ecosystem
A group of organisms that are physically similar and can reproduce with each other to produce fertile offspring.
a) community
b) population
c) species
d) ecosystem
Environmental conditions that prevent populations from increasing.
a) abiotic factors
b) biotic factors
c) limiting factors
d) adaptations
A symbiotic relationship in which one species benefits and the other species is neither helped nor harmed.
a) commensalism
b) mutualism
c) parasitism
d) predation
All the different populations that live together in an area.
a) community
b) population
c) species
d) ecosystem
The living parts of an ecosystem.
a) adaptations
b) biotic factors
c) limiting factors
d) abiotic factors
Behaviors and physical characteristics of species that allow them to live successfully in their environment.
a) adaptations
b) abiotic factors
c) biotic factors
d) limiting factors
An interaction in which one organism kills and eats another organism.
a) commensalism
b) mutualism
c) parasitism
d) predation
If a population is very large or spread out, ecologists use the ____ method to estimate the population size.
a) counting
b) guessing
c) sampling
d) tabulating
All the different species living in an area form a ______.
a) community
b) family
c) population
d) ecosystem
An organism's specific role in its habitat is called its ____.
a) name
b) livelyhood
c) niche
d) right
Every organism has a variety of ____ that enable it to live successfully in its environment.
a) adaptations
b) habitats
c) niches
d) styles
Water, sunlight, and oxygen are examples of ____ factors in ecosystems.
a) abiotic
b) biotic
c) limiting
d) carrying
Students counted 75 sand crabs in a 5-meter by 3-meter section of a beach. What was the population density of sand crabs in that section?
a) 75/3= 25 so the population density is 25 crabs per square meter
b) 75/5= 15 so the population density is 15 crabs per square meter
c) 75/8=9.375 so the population density is 9.375 crabs per square meter
d) 75/15= 5 so the population density is 5 crabs per square meter
The entire beach measures 60 meters by 30 meters. Estimate the total population of sand crabs on the entire beach.
a) 60*30=1800*25=27,000 so 27,000 crabs.
b) 60*30=1800*15=45,000 so 45,000 crabs.
c) 60*30=1800*9.375=16,875 so 16,875 crabs.
d) 60*30=1800*5=9,000 so 9,000 crabs.
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