The Nitrogen Cycle

Front

Photosynthesis

Back

absorbs CO2

Front

Respiration

Back

releases CO2

Front

What percent of the atmosphere is composed of Nitrogen?

Back

78%

Front

Why do all organisms need nitrogen?

Back

To build protein and DNA

Front

What is the correct order for the stages of the nitrogen cycle? Options: Denitrification, Nitrogen Fixing, Nitrification; Nitrification, Denitrification, Nitrogen Fixing; Nitrogen Fixing, Nitrification, Denitrification; Nitrification, Nitrogen Fixing, Denitrification

Back

Nitrogen Fixing, Nitrification, Denitrification

Front

Role of nitrogen-fixing bacteria in the nitrogen cycle

Back

Nitrogen-fixing bacteria convert nitrogen gas into ammonia

Front

What converts some atmospheric nitrogen into nitrates that organisms can use? Options: Sun, Rain, Thunder, Lighting

Back

Lighting

Front

Animals obtain the nitrogen they need directly from the following options: soil in their habitat, air they breathe, plants they eat, bacteria living within them.

Back

plants they eat

Front

Is nitrogen the most plentiful gas in the atmosphere?

Back

True

Front

Plants and animals cannot use nitrogen directly from the air.

Back

True