WorksheetsEcological Communities
Total questions: 15
Worksheet time: 10mins
A community is composed of
living organisms and their nonliving environment.
one species of organism living in a specific environment on Earth.
the factors that constitute an organism's niche.
potentially interacting populations of different kinds of organisms.
An owl and a hawk both eat mice. Which of these describes the relationship between a hawk and an owl?
parasitism
competition
predation
mutualism
The sum total of a population's use of the biotic and abiotic resources of its habitat constitutes its
evolution.
range.
niche.
environment.
In an ecosystem, you would expect to find interspecific competition between
males and females of a species in which both sexes occupy the same niche.
two wasp species that mimic each other's appearance.
populations of two species that occupy the same niche.
a prey species and its predator.
Camouflage typically evolves as a result of
mutualism.
herbivory.
predation.
interspecific competition.
Some herbivore-plant interactions evolved through a series of reciprocal evolutionary adaptations in both species. The process is called
coevolution.
herbivory.
selection.
trophism.
In a hypothetical food chain consisting of grass, grasshoppers, sparrows, and hawks, the grasshoppers are
primary producers.
secondary producers.
primary consumers.
secondary consumers.
Organisms that digest molecules in organic material and convert them into inorganic forms are
detritivores.
primary producers.
decomposers.
primary consumers.
Which of the following statements regarding food webs is true?
Several species of primary consumers may feed on the same species of producer.
A consumer eats only one type of producer.
Detritivores consume dead organic matter from a specific trophic level.
Nutrient transfer moves from producer to consumer and back.
The number of species in a community is called the
species population.
species index.
species diversity.
species richness.
We expect that a keystone species that is a predator will
reduce the diversity of the community.
harvest prey species down to extinction.
help many of its prey reproduce.
maintain the species diversity in a community.
During ecological succession, the species composition of a plant community generally
remains stable as long as major environmental factors (climate, human interference) remain constant.
changes gradually because each species responds differently to the changing environment.
changes from a diverse community in which many plants are common to one in which a few species are numerically dominant.
changes until forest is established and a single species remains.
When a New England farm is abandoned, its formerly plowed fields first become weedy meadows, then shrubby areas, and finally forest. This sequence of plant communities is an example of
secondary succession.
evolution.
primary succession
a trophic chain.
For a given area and time period, the amount of solar energy converted to chemical energy in organic compounds is called
secondary succession.
secondary production.
primary production.
primary succession.
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