nitrogen cycle

Multiple Choice

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

• 78%

• 21%

• 50%

• 10%

Multiple Select

Why is nitrogen important for living organisms?

• Nitrogen is primarily used for energy production in cells.
• Nitrogen is essential for photosynthesis in plants.
• Nitrogen is important for living organisms because it is a fundamental element in DNA, RNA and proteins

• Nitrogen is a key component of carbohydrates.

Multiple Choice

Which of the following are the four main processes in the Nitrogen Cycle?

• Nitrogen Fixation, Ammonification, Nitrification, Denitrification

• Photosynthesis, Respiration, Transpiration, Decomposition

• Evaporation, Condensation, Precipitation, Collection

• Assimilation, Transpiration, Respiration, Combustion

Drag and Drop

Fill in the blank: Nitrogen is “fixed” when it combines with ______ or ______.

Placeholder

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hydrogen, oxygen

carbon, sulfur

helium, neon

chlorine, argon

Multiple Select

Which of the following are ways that nitrogen can be fixed?

• By bacteria in legumes

• By lightning

• By chemical manipulation in industry

• By photosynthesis

Drag and Drop

What is the role of decomposer bacteria in the process of ammonification?

​

Placeholder

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ammonia

nitrogen fixation

photosynthesis

cellular respiration

Multiple Choice

What is the main role of bacteria in the process of nitrification?

• They convert ammonia into nitrites and nitrates.

• They fix nitrogen from the atmosphere.

• They decompose organic matter.

• They absorb nitrates from the soil.

Drag and Drop

Which process in the nitrogen cycle converts nitrogen compounds in the soil back into atmospheric nitrogen?

Placeholder

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Nitrification

Ammonification

Denitrification

Nitrogen fixation

Multiple Select

Which of the following are steps in the nitrogen cycle as shown in the diagram?

• Nitrogen fixation

• Nitrification

• Denitrification

• Photosynthesis

Fill in the Blanks

Fill in the blank: The process that releases toxic nitrogen compounds into the atmosphere is called

.

​- Name of Author

Eutrophication is the process in which a body of water becomes overly enriched with nutrients, such as phosphorus and nitrogen, leading to the excessive growth of algae and other plant life

​- Name of Author

Nitrogen oxides from fossil fuel combustion react with water vapor to form acid rain, which can damage forests, soils, and aquatic ecosystems. 

​- Name of Author

mining operations, like coal mine dump soils, can alter the microbial activity involved in natural nitrogen cycling processes, creating technogenic disturbances. 

Multiple Choice

Describe how human activities can impact the nitrogen cycle, using examples from the images.

• Using organic compost to enrich soil
• Planting more trees to absorb nitrogen
• Human activities like fertilizer use, fossil fuel combustion, and mining disrupt the nitrogen cycle.

• Implementing water conservation techniques

Multiple Choice

How can the use of fertilizers in agriculture contribute to the process of eutrophication, as seen in the images?

• By increasing soil erosion

• By causing nutrient runoff into water bodies

• By reducing plant growth

• By increasing atmospheric nitrogen

Multiple Choice

What is one way human activities can alter the nitrogen cycle in ecosystems?

• By planting more trees

• By increasing nitrogen fertilizers

• By reducing sunlight

• By adding more water