3.4 Nitrogen Cycle

What gas makes up 78% of the air you breathe

• Oxygen

• Carbon

• Nitrogen

Nitrogen is a crucial component in

• proteins

• many vitamins

• DNA

• All of these

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What is air made up of?

• Mostly oxygen

• Mostly nitrogen

• Mostly water

• Mostly carbon-di-oxide

Despite Nitrogen's abundance in life, nitrogen cannot be absorbed and used directly as a nutrient by plants or other organisms.

Nitrogen fixing bacteria in the soil change it into the usable forms of:

• Ammonia (NH3)

  and

  Ammonium ions (NH4)

• Calcium and Ammonium

• Nitrix and Ammonia

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Look at the ram in the picture of the nitrogen cycle, how does the Ram get the nitrates that it needs to assimilate nitrates and protein into their body?

• Eating plants

• Eat nitrogen fixing bacteria

• Breathe it in through the atmosphere

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What type of bacteria fixes atmospheric nitrogen into ammonium and ammonia in the soil

• Nitrogen fixing

• Decomposers

• fertilizer

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What process puts nitrogen back into the atmosphere

• Assimilation

• Nitrogen fixing

• denitrification

Heterotrophic animals that feed on dead particulate, organic matter are called

• Carnivores

• Detritivores

• Omnivores

the process where decomposing organisms like bacteria and fungi break down organic nitrogen compounds from dead plants and animals, converting them into ammonia (NH3), which is then released back into the environment as ammonium ions (NH4+) making it available for plants to use again

• ammonification

• nitrogen fixing

• denitrification

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Farmers remove nitrogen from the atmosphere to make ammonia and ammonium ions which it converted into

• mulch

• fossil fuels

• fertilizer

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