AP Biology Unit 8

What types of organisms indicate primary succession is taking place?

• Trees and flowering plants

• Bears, deer, and rabbits

• moss, lichens, and insects

• grasses, shrubs, and birds

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What do decomposers (bacteria and fungi) do in an ecosystem?

• They return nutrients to the soil

• They take nutrients OUT of the soil

• They return energy to the soil

• They make energy

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Nitrogen Fixation is carried out by

• bacteria 

• plants

• herbivores

• mushrooms

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Since wind, water, and temperature are NOT living they are considered

• Abiotic Factors

• Biotic Factors

If the larvae of a particular species of mosquito are to survive to the adult stage, the eggs must be laid in the trapped pool of water of the northern pitcher plant. The mosquito larvae provide no apparent benefit or harm to the pitcher plant. This type of interaction is an example of

• commensalism

• mutualism

• parasitism

• competition

A group of interbreeding individuals occupying the same area is best called

• community

• population

• ecosystem

• symbiotic relationship

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A species that exerts a large, positive impaction on its ecosystem is known as a:

• Keystone species

• Invasive species

• Indicator species

• Poached species

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Scientists found, that over a period of 200 years, a mountain pond was transformed into a meadow. During that time, several communities of organisms were replaced by different communities. What is this process called?

• limiting factors

• climax community

• pioneer organism

• ecological succession

In eutrophication, what directly causes the death of fish?

• The plants use up oxygen in respiration

• The fish are poisoned by high CO₂ levels

• Bacteria use up oxygen in respiration

• The fish use up oxygen in respiration

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A certain population of mice is growing exponentially. The growth rate of the population (r) is 2.0 and the current population size (N) is 2,500 individuals. How many mice are added to the population each year?

• 1250

• 2500

• 500

• 5000