Biogeochemical Cycle: The Nitrogen Cycle Quiz

2.

Where does on Earth Nitrogen exist in abundance?

Earth's atmosphere
Biosphere
Stratosphere
Troposphere

Correct Answer

A. Earth's atmosphere

Explanation

Nitrogen exists in abundance in Earth's atmosphere. It makes up about 78% of the air we breathe. The atmosphere is a layer of gases surrounding the Earth, and nitrogen is the most abundant gas in this layer. It is essential for life as it is a key component of proteins and DNA. Nitrogen also plays a vital role in the nitrogen cycle, which is crucial for the growth of plants and the overall balance of ecosystems.

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3.

Approximately ___ % of the worlds atmosphere is comprised of Nitrogen.

69%
78%
50%
87%

Correct Answer

A. 78%

Explanation

Approximately 78% of the world's atmosphere is comprised of Nitrogen. This is a significant percentage, indicating that Nitrogen is the most abundant gas in the Earth's atmosphere. It plays a crucial role in various biological processes and is essential for the growth of plants and animals. Nitrogen also helps to regulate the Earth's climate and acts as a buffer against harmful radiation from the sun. Its high concentration in the atmosphere contributes to the overall stability and composition of the Earth's atmosphere.

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4.

Which order is correct?

Fixation, Dentrification, Nitrification, Ammonification
Fixation, Nitrification, Ammonification, Dentrification
Nitrification, Ammonification, Dentrification, Fixation
Fixation, Nitrification, Dentirfication, Ammonification

Correct Answer

A. Fixation, Nitrification, Ammonification, Dentrification

Explanation

The correct order is Fixation, Nitrification, Ammonification, Dentrification. Fixation refers to the process of converting atmospheric nitrogen into a form that can be used by plants. Nitrification is the conversion of ammonium into nitrate by bacteria. Ammonification is the process of converting organic nitrogen into ammonium ions. Dentrification is the final step in the nitrogen cycle, where nitrate is converted back into atmospheric nitrogen by bacteria.

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5.

Why plants cannot utilize Nitrogen naturally occurring in the atmosphere?

They don't have nitrogen-fixing bacteria.
The amount of naturally occurring Nitrogen is not sufficient.
The triple bonds between 2 nitrogen atoms are hard to break.
None of the above.

Correct Answer

A. The triple bonds between 2 nitrogen atoms are hard to break.

Explanation

Plants cannot utilize nitrogen naturally occurring in the atmosphere because the triple bonds between two nitrogen atoms are hard to break. Nitrogen gas (N2) is very stable and cannot be directly used by plants. It requires a process called nitrogen fixation, which is carried out by certain bacteria that can convert N2 into a form that plants can use, such as ammonia (NH3) or nitrate (NO3-). These bacteria have the ability to break the strong triple bonds in N2, making nitrogen available for plant growth.

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6.

Select the 3 other different processes similar to Fixation.

Denitrification
Liquidification
Nitrification
Oxidation
Ammonification

Correct Answer(s)

A. Denitrification
A. Nitrification
A. Ammonification

Explanation

The correct answer is Denitrification, Nitrification, and Ammonification. These three processes are similar to Fixation because they all involve the transformation or conversion of nitrogen compounds. Denitrification is the process by which nitrate is converted back into nitrogen gas, while nitrification is the process by which ammonia is converted into nitrate. Ammonification, on the other hand, is the process by which organic nitrogen compounds are converted into ammonia. These processes play important roles in the nitrogen cycle, contributing to the availability and cycling of nitrogen in ecosystems.

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7.

The process of Fixation is:

The process that causes the strong two-atom nitrogen molecules to break apart so they can combine with other atoms. When it combines with oxygen and hydrogen.
When nitrogen fixes itself to a plant.
When nitrate turns into ammonia, then ammonia turns into plants, then the animals eat the plants and it is turned back into nitrogen.
When nitrogen gets fixed.

Correct Answer

A. The process that causes the strong two-atom nitrogen molecules to break apart so they can combine with other atoms. When it combines with oxygen and hydrogen.

8.

TRUE OR FALSE?Too much nitrogen can damage the plants natural green colour.

TRUE
FALSE

Correct Answer

A. FALSE

Explanation

Nitrogen is what gives plants their healthy green colour.

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9.

In what form does Nitrogen re-enter the Earth after the process of fixation?

Nitrogen
Ammonia
Oxygen
Oxide

Correct Answer

A. Ammonia

Explanation

Nitrogen fixation is the process by which atmospheric nitrogen gas is converted into a usable form by certain microorganisms, primarily bacteria. These bacteria convert nitrogen gas into ammonia (NH3), which can then be utilized by plants to synthesize essential organic compounds like amino acids and proteins. This process is crucial for the nitrogen cycle and the availability of nitrogen for various life forms.

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Biogeochemical Cycle: The Nitrogen Cycle Quiz

Which of the following are directly responsible for nitrogen fixation?

Quiz Preview

Where does on Earth Nitrogen exist in abundance?

Approximately ___ % of the worlds atmosphere is comprised of Nitrogen.

Which order is correct?

Why plants cannot utilize Nitrogen naturally occurring in the atmosphere?

Select the 3 other different processes similar to Fixation.

The process of Fixation is:

TRUE OR FALSE?Too much nitrogen can damage the plants natural green colour.

In what form does Nitrogen re-enter the Earth after the process of fixation?