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Nitrogen cycle quiz

Last updated over 2 years ago

12 questions

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Question 1

1.

Nitrogen is a gas that makes up nearly 80% of Earth's atmosphere.

True

False

Question 2

2.

Nitrogen is a key component of proteins and DNA.

True

False

Question 3

3.

Nitrogen can be directly absorbed by plants from the atmosphere.

True

False

Question 4

4.

Nitrogen is converted into a usable form by lightning.

True

False

Question 5

5.

What is the main reservoir of nitrogen in the nitrogen cycle?

Soil

Atmosphere

Animals

Plants

Question 6

6.

What process converts atmospheric nitrogen into usable nitrogen compounds?

Nitrification

Denitrification

Nitrogen fixation

Assimilation

Question 7

7.

What process returns nitrogen back to the atmosphere?

Denitrification

Ammonification

Assimilation

Nitrification

Question 8

8.

What is the primary source of energy for nitrogen fixation?

Lightning

Photosynthesis

Respiration

Decomposition

Question 9

9.

What are the different forms of nitrogen found in the environment?

Nitrates
Proteins
Ammonium
N2

Water bodies
Living organisms
Soil
Atmosphere

Question 10

10.

Which processes contribute to the nitrogen cycle?

Ammonium to nitrite to nitrate
Nitrate to nitrogen gas
Incorporation of nitrogen into organic molecules
Bacteria

Nitrification
Denitrification
Assimilation
Nitrogen fixation

Question 11

11.

Where do nitrogen-fixing bacteria live?

Rizobium
Azotobacter
Cyanobacteria
Diazotrophs

Root nodules of legume plants
Soil
Wetlands
Marine environments

Question 12

12.

What is the role of denitrifying bacteria in the nitrogen cycle?

Use nitrate instead of oxygen for respiration
Nitrate to nitrogen gas
Create an oxygen-low environment

Energy source
Reduce
Anaerobic conditions