Populations and Biodiversity

The growth rate of a local population is dependent on the birth rate minus the death rate and ____________________________.

• the ratio of males to females in the population
• the lifespan of females beyond the reproductive age
• the amount of genetic variation that exists in the pop.
• the immigration and emigration of the population

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How does too much fishing in an area affect its ecosystem?

• The fish will lay many more eggs to replace fish caught
• organisms that eat fish could become endangered due to starvation
• organisms that eat the fish will become endangered
• people could eat too many fish and become ill

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When taken to a new habitat, non-native plants often threaten native plants of the new habitat.  Why do they do this?

• Non-native plants are able to mutate rapidly
• Non-native  plants cause native animals to relocate
• Non-native plants are able to be used for medicine
• Non-native plants compete with native plants for resources

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The mountain chorus frog is an endangered species in Maryland.  In addition to the loss of habitat, what most likely caused this  frog  population to decline?

• an increase in food source
• more frog breeding grounds
• native wetlands preservation
• poisons dissovled in the water

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How can humans best help an endangered species avoid extinction?

• They can feed the animals
• they can put the animals in a zoo
• they can protect the animals habitat
• they can take the animal to new habitats

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Which of the following is currently a primary cause of species decline worldwide?

• habitat destruction
• intraspecific competition
• random mating
• viral outbreaks

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A hurricane sweeps across a small Caribbean island, killing 50% of the herbivore species on the island.  Which of the following is the most immediate result?

• a reduction in biodiversity
• an acceleration of the carbon cycle
• an increase in predator populations
• a decline in decomposer populations

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The northern spotted owl is listed under the Endangered Species Act as a threatened species in its primary range. Which of the following most likely contributed to the owl's decline?

• increases in rodent populations
• loss of trees from forest habitat
• prevention of wildfires in forest
• decreases in mountain lion populations

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If a paleontologist finds fossils of many species in the same area at approximately the same time, he can conclude that the ecosystem in in this area had a high degree of______.

• climatic variation
• episodic speciation
• biological diversity
• geographic isolation

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Several invasive species eat the fruit of the Loulu tree in Hawaii, this reduces the regeneration rate of the tree.  What would be the outcome for Loulu trees in the future without intervention?

• They would become extinct.
• They would rebound and thrive
• They would remain at their current levels
• They would evolve a new way to reproduce

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