Environmental Science Final Exam Practice

How might the loss of a keystone species impact the stability of the forest ecosystem?

• The loss of a keystone species would have little to no effect on the ecosystem's stability.

• The loss of a keystone species would lead to an increase in stability and biodiversity within the ecosystem.

• The loss of a keystone species would result in a collapse of the ecosystem, causing instability and ultimately leading to its destruction.

• The loss of a keystone species would cause a temporary fluctuation in the ecosystem's stability, but it would eventually return to its original state.

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Which statement BEST communicates an explanation for the stability and change observed in an ecosystem?

• The ecosystem is stable, because it has remained unchanged for many years and is self-regulating.

• The presence of a keystone species in the ecosystem can stabilize it by maintaining the balance between predator and prey populations.

• Changes in environmental conditions, such as temperature and precipitation, can cause a disruption in the ecosystem and lead to instability.

• Human intervention in the ecosystem, such as the introduction of non-native species or pollution, can lead to instability and changes in the ecosystem.

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Predict what would most likely happen to the price of gasoline if the supply of oil that makes gasoline decreases and the demand for gasoline remains unchanged.

• increase

• decrease

• unchanged

• become free

Which statement BEST explains how the average life expectancy trends from 1950-2005 would affect the future population growth of these countries?

• Population will increase since life expectancy improved for both the more developed and less developed countries.

• The less developed countries saw a decrease in life expectancy which would lead to a decrease in population growth.

• The more developed countries will see an exponential increase in population growth due to the high average life expectancy.

• Life expectancy improved for both the more developed and less developed countries, but population growth will remain constant.

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Which argument explains the effect of The Green Revolution on the demand for food?

• The Green Revolution increased the food supply by using more vegetable-based crops.

• The Green Revolution decreased the food supply by using fewer pesticides on the crops.

• The Green Revolution increased the food supply by using high-yield varieties of grains.

• The Green Revolution decreased the food supply by using less expensive fertilizers on the crops.

Which type of energy saw the greatest decrease in 2017?

• fossil fuel

• hydro

• solar

• wind

What is the most likely effect on population growth if the average life expectancy continues to rise in less developed countries?

• Population growth will fluctuate unpredictably.

• There will be no change in population growth rates.

• Population growth will decline as life expectancy increases.

• Population growth will likely accelerate due to longer lifespans.

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What is the primary role of a keystone species in maintaining ecosystem stability?

• It has no significant impact on the ecosystem.

• It increases the rate of ecosystem destruction.

• It regulates population sizes of other species, maintaining balance.

• It provides food for all other species in the ecosystem.

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What is one major consequence of introducing non-native species into an ecosystem?

• It always increases biodiversity and stability.

• It can disrupt the balance and lead to instability in the ecosystem.

• It guarantees the extinction of all native species.

• It has no effect on native species or ecosystem stability.

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If the demand for renewable energy sources increases while their supply remains constant, what is the most likely effect on their market price?

• The price will remain unchanged

• The price will decrease

• The price will increase

• The price will fluctuate randomly