HB - Biodiversity

How would a decrease in the number of organisms that perform these functions most likely affect the ecosystem?

• The interactions between other organisms would stop immediately

• The functions carried out by these organisms would no longer be necessary

• The ecosystem would remain stable

• The ecosystem would become less stable

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An ecosystem will most likely remain stable if

• It has more predators than prey

• It has a high level of biodiversity

• Biotic factors decrease

• Finite resources decrease

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Which condition would cause an ecosystem to become UNSTABLE?

• only heterotrophic organisms remain after a change in the environment

• a slight increase in the number of heterotrophic and autotrophic organisms occurs

• a variety of nonliving factors are used by the living factors

• biotic and abiotic resources interact

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In an ecosystem, the presence of many different species is critical for the survival of some forms of life when

• ecosystems remain stable over long periods of time

• significant changes occur in an ecosystem

• natural selection does not occur

• the finite resources of Earth increase

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An area with many different niches will most likely have

• large numbers of organisms that will become extinct

• no organisms that will become extinct

• little diversity among the organisms

• great diversity among the organisms

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Which statement is valid based on this data about birds?

• The different species in northern Alaska can interbreed

• The average temperatures and rainfall in Costa Rica account for greater biodiversity there

• The different species in southwest Texas evolved from those in northern Alaska

• The greater number of species in Costa Rica is due to a greater number of predators there

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In 1993, there were only 30 panthers in Florida. They were all closely related and many had reproductive problems. To avoid extinction and restore health to the population, biologists introduced 8 female panthers from Texas. Today, there are more than 80 panthers in Florida and most individuals have healthy reproductive systems. The success of this program was most likely due to the fact that the introduced females

• produced more reproductive cells than the male panthers in Texas

• solved the reproductive problems of the species by asexual methods

• increased the genetic diversity of the panther population in Florida

• mated only with panthers from Texas

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Ecosystems will have a greater chance of maintaining equilibrium over a long period of time if they have

• organisms imported by humans from other environments

• a sudden change in climate

• a diversity of organisms

• predators eliminated from the food chains

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One advantage of biodiversity in an ecosystem is that is

• guarantees that the largest organisms will dominate the area

• ensures a large amount of identical genetic material

• develops relationships between organisms that are always positive over long periods of time

• increases the chance that some organisms will survive a major change in the environment

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The level of biodiversity in ecosystem A is high because it has the

• least variety of energy levels

• greatest variety of genetic material

• greatest number of decomposers

• least number of ecological niches

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