Lesson3: The Nitrogen Cycle

Lesson3: The Nitrogen Cycle

by yamna Alketbi

Water Cycle - Labelled diagram

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​The Nitrogen Cycle

Multiple Choice

Plants and animals need nitrogen to make __________.

• Protein

• Carbohydrates

• Lipids

• Minerals

Multiple Choice

Organisms that need nitrogen to survive.

• only plants

• only bacteria

• only animals

• all living things

Multiple Choice

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

• Through action of bacteria only

• Through action of bacteria and lightning

• Through lightning only

• 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

Plants and animals cannot use nitrogen directly from the air.

• True

• False

Multiple Choice

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

• bacteria

• fungi

• rain

• car exhaust

Multiple Choice

The process in which nitrogen circulates and is recycled is called

• The water cycle

• The carbon cycle

• The nitrogen cycle

• The phosphorus cycle

Multiple Choice

The process that changes atmospheric nitrogen gas into nitrogen compounds that are usable by living things is called

• nitrogen composition

• ammonia

• denitrification

• nitrogen fixation

Multiple Choice

Book Page 57

Keisha and her classmates created a model of the nitrogen cycle. Their diagram is shown

What is the Function of the bacteria shown in the model?

• A. They prevent the nitrogen from harming the plants.

• B. They remove the nitrogen from the soil.

• C. They remove the oxygen from the soil.

• D. They return the nitrogen to the system.

Multiple Choice

Book Page 57

Which of the following is NOT true a bout systems that cycle matter?

• A. Living things play a role in the cycling of matter.

• B. Matter changes from as it cycles.

• C. Some matter is destroyed as it cycles through the environment.

• D. Matter is constantly cycling thought the environment. 

​Now you are able to identify the main parts of nitrogen cycle