Biogeochemical Cycles

The most common elements in organic molecules

• Carbon and Nitrogen

• Hydrogen and Oxygen

• Sulfur and Phosphorus

• All are correct

Energy flows through an ecosystem and is dissipated as heat, but chemical elements are recycled.

• True

• False

What is a Biogeochemical Cycle?

• How energy flows through ecosystems.

• How the sunlight is transform into heat.

• The ways in which an element moves in the Biosphere.

• None of these.

Which biogeochemical cycles are key to life?

• Carbon and Nitrogen

• Water and Oxygen

• Phosphorus

• All are correct

Process that converts Nitrogen from the atmosphere into forms that plants can absorb through their root systems.

• Mineralization

• Nitrification

• Fixation

• Denitrification

Its reserves are found in the soil.

• Nitrogen

• Oxygen

• Carbon

• Phosphorus

The most abundant element in the atmosphere.

• Nitrogen

• Oxygen

• Carbon

• Phosphorus

Chemical element that makes up living or dead organic matter.

• Nitrogen

• Oxygen

• Carbon

• Phosphorus

Chemical element released during photosynthesis.

• Nitrogen

• Oxygen

• Carbon

• Phosphorus

In marine systems, Nitrogen settles to the bottom and after several years forms sedimentary rocks.

• True

• False