Exam 23: Ecosystems and Populations

Each chemical element cycles between three different pools of the biogeochemical cycle: the exchange pool, biomass, and reservoir. Match each of the following to the pool in which it would be classified. Answers may be used more than once. A) exchange pool B) biomass C) reservoir -carbon dioxide in the atmosphere

The total living component of an ecosystem is its

Once populations exceed the carrying capacity of the environment, environmental resistance increases.

The phosphorus cycle is unique from nitrogen and carbon in that it

In a graphical representation of an organism's population growth in a given habitat, the growth rate for an organism whose population is increasing according to its biotic potential is best represented by a(n)

Modern farming practices have advanced to the point where they have little impact on the balance of existing ecosystems in the area.

For an organism reaching its biotic potential, the growth rate is characterized by a(n) ________ curve.

Population sizes begin to stabilize near the carrying capacity when

Match each term to its definition. -all populations of all species occupying the same geographical area

Woodpeckers, insects, bacteria, hawks, and raccoons are found to reside in the same forest. Studies of the interactions between these organisms would be at the level of a

In plants, ammonium is often converted to nitrate before it can be used by the plant. This process is known as

Unlike the carbon and nitrogen cycles, the phosphorous cycle is classified as a(n) ________ cycle because phosphorus never enters the atmosphere.

Approximately ________% of the stored energy of an organism at one level of a food web is transferred to the tissues of the organism that consumes it at the next level of the food web.

Each chemical element cycles between three different pools of the biogeochemical cycle: the exchange pool, biomass, and reservoir. Match each of the following to the pool in which it would be classified. Answers may be used more than once. A) exchange pool B) biomass C) reservoir -minerals in solid rock

In a given geographic location, the combination of all living organisms plus the physical environment in which they live is termed a(n) ________.

Which one of the following statements is TRUE regarding the nitrogen cycle?

A population that is increasing at a rate of 10% a year will double in 7.2 years.

Most precipitation reaching land results from

If an owl is moved from a mature evergreen forest to a mature hedgerow in a suburban neighborhood, the owl's ________ has been changed.

Biogeochemical cycles that involve exchange between living organisms and atmospheric gases are called ________ cycles.