The Nitrogen Cycle

Which of the following processes is part of the Nitrogen Cycle?

• Photosynthesis

• Nitrogen Fixation

• Respiration

• Transpiration

In the Nitrogen Cycle, _______ is the process where atmospheric nitrogen is converted into a form usable by plants.

• Nitrification

• Nitrogen Fixation

• Denitrification

• Assimilation

Tags

NGSS.MS-LS2-3

What percentage of the Earth's atmosphere is made up of nitrogen?

• 21%

• 78%

• 50%

• 90%

Nitrogen is an essential component of _______ and nucleic acids.

• carbohydrates

• amino acids

• lipids

• vitamins

Tags

NGSS.MS-LS2-1

The nitrogen cycle involves the conversion of nitrogen between various chemical forms. Which of the following is NOT a part of this process?

• Ammonium (NH₄⁺)

• Nitrates (NO₃⁻)

• Sulfates (SO₄²⁻)

• Nitrites (NO₂⁻)

Fill in the blank: The nitrogen cycle is crucial for maintaining _______ in ecosystems.

• imbalance

• balance

• chaos

• disorder

Tags

NGSS.MS-LS2-3

What are the two main types of nitrogen fixation?

• Abiotic and Chemical

• Biological and Chemical

• Abiotic and Biological

• Chemical and Physical

Tags

NGSS.MS-LS2-3

Fill in the blank: An example of abiotic nitrogen fixation is _______.

• Rhizobium bacteria

• Lightning

• Decomposers

• Denitrifying bacteria

What is the first step in the nitrification process?

• Ammonium to nitrate

• Ammonium to nitrite

• Nitrite to nitrate

• Nitrite to ammonium

In the nitrification process, Nitrite (NO₂⁻) is converted to ______.

• Nitrate (NO₃⁻)

• Nitrite (NO₂⁻)

• Nitrogen gas (N₂)

• Ammonia (NH₃)

Tags

NGSS.MS-ESS2-1

NGSS.MS-LS2-3