Exam 19: Ecosystem Essentials

Which of the following is the largest carbon sinks?

In food webs, toxic chemicals tend to accumulate and concentrate most in the

Approximately half of the cultivated acreage in the United States and Canada is planted for animal consumption.

If a lava flow completely denudes a mountain, leaving only bare rock, what type of succession will follow?

Net primary productivity is a measurement of how much each individual plant photosynthesizes.

Hydrogen, oxygen, and carbon together make up more than 99% of the Earth's biomass.

The term biodiversity encompasses not only the number and variety of different species, but also genetic variations within a species and even the varieties of ecosystems, habitats, and communities in an area.

Mistletoe (Phoradendron) infest many taxa of plants, often causing the branches of the host species to become swollen and distorted and making the trees more susceptible to insect infestations. This is an example of which symbiotic relationship?

The net photosynthesis for an entire ecosystem is known as the

Together, three natural elements make up 99% of the Earth's biomass. Which of the following is not one of those three elements?

Continental drift separating a once continuous population is an example of

A lake classified as oligotrophic has high nutrient content.

Species extinctions have occurred throughout Earth's history, so the recent loss of species is likely something of little concern.

Provide a hypothetical or a historical example of both primary and secondary succession.

Which of the following is incorrect regarding the spatial variability of net primary productivity?

An ecosystem is a self-regulating association of living plants and animals and their nonliving physical environment.

A dead zone refers to

A monocultural agriculture community is ________ vulnerable to disturbance than an area with high biodiversity.

In which of the following marine/aquatic ecosystems would one tend to find the highest net primary productivity?

A black walnut (Juglans nigra) emits a chemical that may kill or inhibit the growth of other nearby shrubs or trees. However, the black walnut is unaffected by this interaction. This is an example of which symbiotic relationship?