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Name: ________________________________________________________
Ms. Kim
Biology Period _________
Date: ________/________/________
Ecology Unit Exam Study Guide
Standard 6.a Students know biodiversity is the sum total of different kinds of organisms and is affected by
alterations of habitats.
Re-word the standard in your own words here.
1) Which of the following is a benefit of biodiversity?
A. increased trade of wild game and fish
B. inclusion on the endangered species list
C. a greater variety of crops and vegetation
D. controlled use of pesticides in agriculture
2) In general, the tropics tend to be the most biodiverse regions on Earth. For example, there are
approximately six times the number of bird species that are native to the tropics than there are
bird species native to colder regions.
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Identify TWO factors that make the tropics more biodiverse. __________________ & __________________
During Earth's ice ages, global temperatures dropped and glaciers advanced. How is biodiversity
likely to change as an ice age sets in? Explain your answer.
3) Which of these human activities directly results in increased biodiversity in an area?
A. reintroducing native fishes to a lake
B. removing litter and trash from a beach
C. draining a healthy wetland and planting crops
D. counting the types of plants living in a meadow
Standard 6.b Students know how to analyze changes in an ecosystem resulting from changes in climate,
human activity, introduction of nonnative species, or changes in population size.
Re-word the standard in your own words here.
4) Around the world, there has been a decrease in habitats for snakes. The cause of this has been
attributed to land being cleared for human settlements. What is an immediate effect on the snake
populations?
A. an adaptation of snakes to their new surroundings
B. an extension of the snake habitat to backyards of houses
C. a decline in the snake population as snakes lose their habitat
D. an increase in the snake population due to reproduction compensation
Standard 6.c Students know how fluctuations in population size in an ecosystem are determined by the
relative rates of birth, immigration, emigration, and death.
Re-word the standard in your own words here.
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5) A brown tree snakes is native to Australia but was introduced accidentally to the island of
Guam. After introduction, the population of brown tree snakes on Guam grew rapidly. Which
statement explains how the population of brown tree snakes most likely grew?
A. The death rate was much higher than the birth rate.
B. The birth rate was much higher than the death rate.
C. The emigration rate was much higher than the immigration rate.
D. The immigration rate was much higher than the emigration rate.
Standard 6.d Students know how water, carbon, and nitrogen cycle between abiotic resources and organic
matter in the ecosystem and how oxygen cycles through photosynthesis and respiration.
Re-word the standard in your own words here.
6) In the nitrogen cycle, what is one way that atmospheric nitrogen enters the soil directly?
A. through precipitation
B. through the activity of microorganisms
C. through the decomposition of factory emissions
D. through photosynthesis carried out by green plants
Standard 6.e Students know a vital part of an ecosystem is the stability of its producers and decomposers.
Re-word the standard in your own words here.
7) The heavy equipment used during logging compacts the soil, reducing air and water flow to
fungi and soil microorganisms. How will damage to the fungi MOST LIKELY affect the ecosystem?
A. Plants will be less affected by diseases.
B. Nutrients will not be recycled as quickly or efficiently.
C. Producers will no longer be able to capture energy from the Sun to make sugars.
D. More nutrients will be available to plants because the nutrients are not being used by fungi.
Standard 6.f Students know at each link in a food web some energy is stored in newly made structures but
much energy is dissipated into the environment as heat. This dissipation may be represented in an energy
pyramid.
Re-word the standard in your own words here.
8) Which statement BEST explains why the height of the energy pyramid is limited?
A. A large amount of the energy produced at each trophic level is dissipated
as heat.
B. The number of tertiary consumers is the least, as they belong to the
highest trophic level.
C. Organisms at the higher trophic level receive more energy than those at
the lower trophic level.
D. The producers receive very little energy from the Sun, a they belong to
the lowest trophic level.