Nitrogen Cycle

Nitrogen Cycle

By Erica Maresh

Multiple Select

Which biomolecules rely on nitrogen being available to be produced by a cell to maintain life? (Select 2)

• Protein

• Carbohydrate

• Nucleic Acid

• Lipid

Multiple Select

Which need nitrogen to be produced by a cell to maintain life? (select 2)

• Glucose

• an enzyme

• RNA

• cell membranes

Multiple Choice

What converts nitrogen gas into a usable form for plants and animals?

• bacteria

• rain

• fungi

• car exhaust

Multiple Choice

Organisms that need nitrogen to survive.

• only plants

• only animals

• only bacteria

• all living things

Multiple Choice

How is nitrogen "fixed" into a usable form for plants?

• Through action of bacteria only

• Through lightning only

• Through action of bacteria and lightning

• Through photosynthesis

Multiple Choice

How do animals get the nitrogen they need?

• From the air they breathe

• From the water they drink

• From the food they eat

• From the sun

Multiple Choice

The process in which nitrogen circulates and is recycled is called

• The nitrogen cycle

• The carbon cycle

• The water cycle

• The phosphorus cycle

Multiple Choice

What process occurs when dead plant and animal matter decomposes and nitrogen is released back into the atmosphere?

• Assimilation

• Fixation

• Ammonification

• Denitrification

Multiple Choice

Plants and animals cannot use nitrogen directly from the air.

• True

• False

Multiple Choice

Bacteria fix nitrogen from the atmosphere into a form plants can use.

• True

• False

Multiple Choice

According to this diagram, plants use nitrogen to make _________________________

• carbohydrates

• cellulose

• proteins

• unsaturated fats

Multiple Choice

What is the role of decomposing bacteria in the nitrogen cycle?

• change Nitrogen gas into Nitrate

• Return the nitrogen compounds to the soil

• Turn nitrogen into water

• Turn nitrate into nitrogen gas

Multiple Choice

What would be a consequence of removing the decomposers from an ecosystem?

•  Plants would not need to absorb nitrogen from the soil any longer

• Lightening would no longer convert nitrogen gas into ammonia

• Plants would begin decomposing organisms instead of performing photosynthesis

• Nitrogen would remain trapped in the tissues of dead organisms

Multiple Choice

What does the color green indicate on the map

• There was a deficiency of nitrogen fertilizer in the soil

• There was an excess of nitrogen fertilizer in the soil

• There was exactly enough nitrogen fertilizer in the soil

• No fertilizer was used

Multiple Choice

Denitrifying bacteria

• Turn nitrogen gas into nitrates so that plants can synthesize amino acids.

• Turn nitrates into nitrites so that nitrogen fixing bacteria can synthesize DNA.

• Returns nitrogen into the atmosphere in the form of N₂ gas.

• Use phosphorus as fertilizer.

Multiple Choice

How do  animals get nitrogen?

• the atmosphere 
• eating other organisms
• bacteria
• lightning 

Multiple Choice

Organisms require nitrogen to make which of the following?

• glucose and starch

• lipids and nucleic acids

• proteins and nucleic acids

• carbohydrates and proteins