Exam 26: Population Growth, Resource Use, and Sustainability

________ is a technique employed to add and compare costs and benefits that occur at different points in time.

Genetically modified crops rely on the insertion of a beneficial gene from a closely related species because genes from distantly related species are incompatible.

As biomass in a forest increases, the density of trees decreases, while the average tree size increases as a result of self-thinning.

Using an example from farming, forestry, or fisheries, discuss the concept of discounting and how it is used to economically justify the overexploitation of a resource.

Compare and contrast three agricultural practices. What are the trade-offs for each and how do they differ from a natural system?

The amount of a resource harvested per unit time is called ________.

Which of the following is NOT a characteristic of swidden agriculture or shifting cultivation?

Species characterized by a very high rate of population growth often lose much of their production due to high density-independent mortality.

Soil erosion increases when trees are removed from a forest.

When trees are harvested and removed

Nitrate is a commonly used chemical fertilizer that is harmless to human health.

Explain what is meant by "the tragedy of the commons."

Industrialized agriculture produces a higher yield than traditional agriculture but also requires more energy per unit of food produced.

The vast majority of human food resources are derived from agriculture.

Traditional agriculture is dominated by ________ agriculture in which primarily human labor and draft animals are used to produce only enough crops or livestock for a family to survive.

A sustained yield refers to the

A method of subsistence farming that is practiced primarily in the tropical forested regions is called shifting cultivation, or ________ agriculture.

When chemical fertilizers are transported from agricultural lands into adjacent aquatic habitats, accelerated nutrient enrichment of aquatic habitats leads to major ecological changes termed cultural ________.

For the exploitation of a resource to be sustainable, the consumption rate must be equal to or greater than the regeneration rate.

What are the pros and cons of aquaculture? What do you think is the solution to the cons?