Question 1

Which of the following best describes the difference between Gross Primary Production (GPP) and Net Primary Production (NPP) in an ecosystem?

Accepted Answer

GPP is the total amount of energy captured by autotrophs, while NPP is the energy remaining after autotrophs' respiration is subtracted from GPP.

Question 2

A lake receives excess nitrogen and phosphorus from nearby agricultural runoff, resulting in a rapid increase in algal growth. Which process is most directly responsible for the subsequent formation of a 'dead zone' in the lake?

Accepted Answer

Decomposition of algal biomass by bacteria consumes dissolved oxygen, leading to hypoxic conditions.

Question 3

Which of the following best explains why introduced species often spread rapidly in new environments?

Accepted Answer

They often lack natural predators or pathogens in the new environment, allowing unchecked population growth.

Question 4

A wildlife corridor is constructed to connect two isolated forest patches. Which of the following is a potential risk associated with this conservation strategy?

Accepted Answer

It may facilitate the spread of diseases or invasive species between previously isolated populations.

Question 5

Which of the following equations correctly represents the relationship between Gross Primary Production (GPP), Net Primary Production (NPP), and plant respiration ($$R_a$$)?

Accepted Answer

$$NPP = GPP - R_a$$

Question 6

Which of the following is an example of biological magnification (biomagnification) in a food web?

Accepted Answer

PCBs accumulate in higher concentrations in top predators, such as eagles, compared to lower trophic levels.

Question 7

Which of the following best describes the 'edge effect' in fragmented habitats?

Accepted Answer

Physical conditions such as temperature, light, and wind differ at habitat edges, often favoring edge-adapted species over interior specialists.

Question 8

Which of the following is a direct consequence of ozone depletion in the stratosphere?

Accepted Answer

Increased ultraviolet (UV) radiation reaching Earth's surface, leading to higher rates of skin cancer and ecosystem damage.

Question 9

A conservation biologist is designing a nature reserve using island biogeography theory. According to this theory, which combination of reserve size and isolation will best support high species richness?

Accepted Answer

A large reserve that is close to other natural habitats.

Question 10

Which of the following is NOT considered one of the three pillars of sustainable development?

Accepted Answer

Cultural diversity

Question 11

Which of the following best describes the role of decomposers in an ecosystem?

Accepted Answer

They break down dead organic matter, recycling nutrients back into the ecosystem.

Question 12

Which of the following is a major human impact on the nitrogen cycle?

Accepted Answer

Application of synthetic fertilizers increases nitrogen runoff, leading to eutrophication of aquatic systems.

Question 13

Which of the following best defines a 'biodiversity hot spot'?

Accepted Answer

A relatively small area with a high number of endemic species and a high degree of threat from human activities.

Question 14

Which of the following is an example of an ecosystem service provided by biodiversity?

Accepted Answer

Pollination of crops by wild insects, supporting food production.

Question 15

Which of the following best describes the greenhouse effect?

Accepted Answer

Greenhouse gases in the atmosphere absorb and re-radiate infrared radiation, warming Earth's surface.

Question 16

Which of the following is a correct chain of events leading from fertilizer application to the formation of a marine dead zone?

Accepted Answer

Fertilizer runoff $$\rightarrow$$ algal bloom $$\rightarrow$$ increased decomposition $$\rightarrow$$ oxygen depletion $$\rightarrow$$ marine dead zone

Question 17

Which of the following best describes the concept of 'critical load' in ecosystem management?

Accepted Answer

The maximum amount of a nutrient that can be added to an ecosystem without causing environmental harm.

Question 18

Which of the following is a key difference between a carbon sink and a carbon source?

Accepted Answer

A carbon sink absorbs more carbon than it releases, while a carbon source releases more carbon than it absorbs.

Question 19

Which of the following best describes the extinction vortex?

Accepted Answer

A process in which small populations are driven to extinction by a downward spiral of genetic, demographic, and environmental factors.

Question 20

Which of the following is a real-world example of restoration ecology?

Accepted Answer

The Kissimmee River project, which restored natural river flow and wetland habitats after channelization.

Comprehensive Study Guide for Ecosystem Ecology, Restoration, Conservation, and Human Impacts

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