BGC Cycles (APES)

The type of plant that has roots with nodules housing symbiotic bacteria instrumental in the nitrogen cycle.

• Conifers
• Legumes
• Succulents
• Orchids

Organisms require nitrogen to make which of the following?

• glucose and starch
• lipids and nucleic acids
• proteins, chlorophyll,  and nucleic acids
• carbohydrates and proteins

How much of the atmosphere is composed of nitrogen gas?

• 87%
• 38%
• 78%
• 21%

This gas makes up 21% of the atmosphere

• ozone
• oxygen
• nitrogen
• water vapor

What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

• nitrogen composition
• ammonia 
• nitrogen fixation
• denitrification

How do  animals get nitrogen?

• the atmosphere 
• eating other organisms
• bacteria
• lightning 

Plants and animals cannot use nitrogen directly from the air.

• True
• False

Nitrogen is the most plentiful gas in the atmosphere.

• True
• False

Organisms that play a role in the nitrogen cycle

• only plants
• only animals
• only bacteria
• plants, animals, & bacteria

Organisms that need nitrogen to survive

• only plants
• only animals
• only bacteria
• all living organisms