Nitrogen Cycle Lesson Quziz

Nitrogen cycle

Multiple Choice

What would happen to the plants in this nitrogen cycle if all the bacteria died?

• They would not get the nitrogen they need.

• They would get their nitrogen directly from the atmosphere

Multiple Choice

What is the percentage of the Nitrogen in the air ?

• 1%

• 21%

• 78%

Multiple Choice

Based on the picture, what is the chemical formula for atmospheric nitrogen?

• N

• N₂

• NH₃

• NO₃

Multiple Choice

Plants and animals cannot use nitrogen directly from the air.

• True

• False

Multiple Choice

Which of these nitrogen cycle processes converts atmospheric nitrogen to a soil form of nitrogen that is usable by plants?

• nitrogen fixation

• nitrification

• denitrification

• ammonification

Multiple Choice

How nitrogen is "fixed" into useable form for plants...

• Through action of bacteria only

• Through lightning only

• Through action of bacteria & lightning

Multiple Choice

True or False:

Bacteria create a form of nitrogen that ANIMALS can use directly

• True

• False

Multiple Choice

A correct path that nitrogen could take would be _____

• air -> animals->plants->bacteria

• air -> bacteria ->plants -> animals

Multiple Choice

True or False:

Bacteria release nitrogen from dead organisms into the soil.

• True

• False

Multiple Choice

According to the picture which organism is responsible for nitrogen in the atmosphere being converted to a usable form?

• Cows

• Trees

• Bacteria

• Grass

Multiple Choice

What does it mean for nitrogen to be fixed.

• Nitrogen is held firmly in place

• Nitrogen is destroyed

• Nitrogen is changed into a usable form

• Nitrogen was broken but is now prepared.

Multiple Choice

What role do decomposers play in the nitrogen cycle

• They break down dead and waste matter to return nitrogen to the soil.

• They cause harmful pollutants

• They assist the plants in photosynthesis

Multiple Choice

Why is the nitrogen cycle important for the survival of organisms in an ecosystem?

• The nitrogen cycle recycles nitrogen through an ecosystem, making it available to all organisms.

• The nitrogen cycle allows all organisms in an ecosystem to consume nitrogen instead of consuming each other.

• The nitrogen cycle stores nitrogen in safe places, keeping it from entering an ecosystem.

• The nitrogen cycle keeps organisms from consuming nitrogen in their ecosystem.