Biogeochemical Cycles

Review Questions

The movement of mineral nutrients through organisms and their environment is called a ________ cycle.

  1. biological
  2. bioaccumulation
  3. biogeochemical
  4. biochemical

Hint:

C

Carbon is present in the atmosphere as ________.

  1. carbon dioxide
  2. carbonate ion
  3. carbon dust
  4. carbon monoxide

Hint:

A

The majority of water found on Earth is:

  1. ice
  2. water vapor
  3. fresh water
  4. salt water

Hint:

D

The average time a molecule spends in its reservoir is known as ________.

  1. residence time
  2. restriction time
  3. resilience time
  4. storage time

Hint:

A

The process whereby oxygen is depleted by the growth of microorganisms due to excess nutrients in aquatic systems is called ________.

  1. dead zoning
  2. eutrophication
  3. retrofication
  4. depletion

Hint:

B

The process whereby nitrogen is brought into organic molecules is called ________.

  1. nitrification
  2. denitrification
  3. nitrogen fixation
  4. nitrogen cycling

Hint:

C

Which of the following approaches would be the most effective way to reduce greenhouse carbon dioxide?

  1. Increase waste deposition into the deep ocean.
  2. Plant more environmentally-suitable plants.
  3. Increase use of fuel sources that do not produce carbon dioxide as a by-product.
  4. Decrease livestock agriculture.

Hint:

B

How would loss of fungi in a forest effect biogeochemical cycles in the area?

  1. Nitrogen could no longer be fixed into organic molecules.
  2. Phosphorus stores would be released for use by other organisms.
  3. Sulfur release from eroding rocks would cease.
  4. Carbon would accumulate in dead organic matter and waste.

Hint:

D