Unit 2B Nutrient Cycles

Which of the following is NOT an organic molecule?

• Water

• Carbohydrates

• Protein

• DNA

Water vapor in the atmosphere undergoes ________ to become liquid again, the same as when water droplets form on a bathroom mirror or outside of a cold glass of water.

• Condensation

• Percolation

• Evaporation

• Transpiration

Water in the atmosphere returns to earth as either rain, sleet, hail, or snow in a process called _____

• Groundwater Flow

• Evaporation

• Transpiration

• Precipitation

In the Nitrogen Cycle, _____ are important for the process of Nitrogen Fixation, which takes Nitrogen gas from the atmosphere and forms compounds that other organisms can use.

• Fungi

• Bacteria

• Plants

• Insects

Which of the following molecules is NOT an organic molecule?

• Salt

• DNA

• Sugar

• Fats

Nitrogen in the soil is returned to the atmosphere by bacteria, a process called _____

• Denitrification

• Combustion

• Percolation

• Nitrogen Fixation

How is the carbon in many fossil fuels returned to the atmosphere?

• Respiration

• Carbon Sink

• Decomposition

• Combustion

Which of the following natural resources is NOT renewable?

• Solar

• Wind

• Hydroelectric

• Natural Gas

In the Carbon Cycle, Plants are very important because they take in Carbon Dioxide (CO2) using a process called _____ and convert it to a useable form.

• Decomposition

• Respiration

• Photosynthesis

• Nitrogen Fixation

Nitrogen is contained in many fertilizers, but applying them to the surface of lawns and fields allows _____ to concentrate nitrogen in rivers and lakes.

• Fish

• Precipitation

• Surface Runoff

• Denitrification