Populations and Biological Communities
Showing posts with label Populations and Biological Communities. Show all posts
Showing posts with label Populations and Biological Communities. Show all posts

What is ecological balance?

04:32

What is ecological balance?



A - The condition of equilibrium between native and non-native species in an environment
B - The condition of equilibrium among members of the same species in an ecosystem
C - None of these
D - The condition of equilibrium among the different species in an ecosystem


Answer: D - The condition of equilibrium among the different species in an ecosystem

What is a climax community?

04:31

What is a climax community?



A - The first community of organisms to colonize a habitat in the ecological succession process.
B - The community that was present before an ecological disturbance occurred.
C - The ecological community with the highest species diversity that can occupy a given habitat.
D - The ecological community with the highest biomass that can occupy a given habitat.
E - The community that can be stably maintained after ecological succession is completed.


Answer: E - The community that can be stably maintained after ecological succession is completed.

Which of the following is a TRUE statement about introduced species?

04:31

Which of the following is a TRUE statement about introduced species?


A - Introduced species that become established in their new environment are able to do so because they are able to evolve quicker than introduced species that do not become established
B - To be successful, introduced species must find a way to survive all of the same environmental and community factors that native species have to survive.
C - Introduced species are usually better equipped to survive in an ecosystem than the native species are.
D - Ecologists can easily predict the effects of introducing a new species to an ecosystem.
E - If an introduced species becomes established it will always become invasive.


Answer: B - To be successful, introduced species must find a way to survive all of the same environmental and community factors that native species have to survive.

What is an invasive species?

04:31

What is an invasive species?



A - A species that is continuously expanding its range
B - A non-native species whose introduction into an area has caused economic or ecological harm
C - A species that is living outside of its native environment and was brought there by human activity
D - A species that is naturally found in an area and was not introduced by humans
E - Any introduced species that survives and thrives in its new environment

Answer: B - A non-native species whose introduction into an area has caused economic or ecological harm

If an introduced species survives in its new environment and starts breeding, what are the likely consequences?

04:31

If an introduced species survives in its new environment and starts breeding, what are the likely consequences?



A - Species diversity in the area will be increased as native species have to quickly evolve to find new ways to survive with a new species.
B - All native species in the area will be negatively impacted.
C - The introduced species is unlikely to impact the other organisms living in the area.
D - The introduced species may impact some species, but only those that it is in direct competition with or that it feeds on.
E - Some native species will be negatively impacted, and some may even go locally extinct, but it is impossible to predict exactly which species, or how many will be affected.


Answer: E - Some native species will be negatively impacted, and some may even go locally extinct, but it is impossible to predict exactly which species, or how many will be affected.

Which of the following is a major goal of conservation biologist?

04:30

Which of the following is a major goal of conservation biologist?



A - Establish new National Parks
B - Study and characterize as many different species of organisms as they can before they go extinct
C - Convert as much farmland as they can back to natural habitat
D - Preserve healthy populations of as many different species as they can
E - Stop all construction projects which will destroy any natural habitat


Answer: D - Preserve healthy populations of as many different species as they can

According to metapopulation theory, what will happen when a population of a particular species goes locally extinct in a particular patch of habitat?

04:30

According to metapopulation theory, what will happen when a population of a particular species goes locally extinct in a particular patch of habitat?



A - The species is gone from the patch forever
B - That patch of habitat will be destroyed or in some way will no longer be habitable by the species, otherwise the species would not have gone locally extinct there.
C - The patch will not remain empty for more than a year because each year when a new batch of organisms matures, they will colonize every available patch.
D - Another competing species will colonize the patch and exclude the first species from the patch if it tries to recolonize.
E - The patch may remain empty for a period of time, but eventually the species will recolonize the patch from another patch within the metapopulation.


Answer: E - The patch may remain empty for a period of time, but eventually the species will recolonize the patch from another patch within the metapopulation.

The chaparral biome is characterized by what?

04:30

The chaparral biome is characterized by what?



A - Dense evergreen shrubs in the summer and small soft-leaved plants in the winter
B - Periodic fires
C - Poor soil and very little rainfall
D - Most of the biomass is contained within the woody shrubs that dominate the vegetation
E - Dense evergreen shrubs; mild, wet winters; hot, dry summers


Answer: E - Dense evergreen shrubs; mild, wet winters; hot, dry summers

What is the effect of predation on prey?

04:29

What is the effect of predation on prey?



A - Predation is a strong selective force for prey organisms
B - Predation will make prey organisms wait longer to reproduce
C - Predation makes all of the individuals in the populations being preyed upon less fit
D - Predation doesn't have any long term effects on prey organisms


Answer: A - Predation is a strong selective force for prey organisms

Which of the following is a function of the National Park Service in the United States?

04:29

Which of the following is a function of the National Park Service in the United States?



A - All of these
B - Support the last wild herds of American bison
C - Protect America's natural treasures
D - Ensure that human activities do not destroy all of the natural habitat in the United States
E - Ensure that several wild populations of organisms can maintain a range large enough to support a stable population


Answer: A - All of these

Which of the following is NOT a feature of a metapopulation?

04:29

Which of the following is NOT a feature of a metapopulation?



A - Overall, colonization events must occur at least as frequently as local extinctions
B - Local extinction is likely to occur in any given patch of habitat eventually
C - Several local populations are connected by infrequent immigration events
D - Migration events happen frequently
E - A metapopulation is composed of several smaller, separated populations


Answer: D - Migration events happen frequently

What is a wildfire corridor?

04:29

What is a wildfire corridor?



A - A large, continuous area of undisturbed natural habitat
B - An area that has been developed by humans, but where wildlife is still frequently seen
C - An area of habitat that runs alongside a road
D -A natural migration route of a population of animals
E - A route that animals can use to migrate between different patches of natural habitat


Answer: E - A route that animals can use to migrate between different patches of natural habitat

How have humans caused habitat fragmentation for animal and plant species around the world?

04:28

How have humans caused habitat fragmentation for animal and plant species around the world?



A - By introducing organisms to unfavorable habitats
B - By reducing pollution rivers and streams
C - By converting natural habitats to farmland
D - By encouraging reproductive processes in immobile organisms


Answer: C - By converting natural habitats to farmland

What does the term colonization mean in terms of organisms?

04:28

What does the term colonization mean in terms of organisms?



A - A one-time migration of an organism or group of organisms into an area
B - When an organism creates a new niche for itself that is not being exploited by any other species
C - When a species starts to populate a habitat where the species was not already present


Answer: D - The seasonal movement of organisms over long distances

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