Untitled Presentation

Open Ended

How do biological and physical processes contribute to the conversion of nitrogen into different forms in the nitrogen cycle?

Multiple Choice

Why is the nitrogen cycle significant for ecosystems?

• It helps maintain oxygen levels

• It affects decomposition and primary production

• It increases carbon dioxide in the atmosphere

• It prevents water pollution

Open Ended

Describe how organic nitrogen is important for living organisms.

Open Ended

Explain the role of nitrification in the nitrogen cycle.

Multiple Choice

What are the main differences between ammonia/ammonium and nitrates in terms of their role in plant nutrition?

• Ammonia/ammonium is produced by decomposition and nitrogen fixation, while nitrates are absorbed by plant roots to make amino acids, proteins, and DNA.

• Nitrates are produced by decomposition, while ammonia/ammonium is absorbed by plant roots.

• Ammonia/ammonium is only found in animals, while nitrates are only found in plants.

• Both ammonia/ammonium and nitrates are inert and cannot be used by plants.

Multiple Choice

Which forms of nitrogen are directly usable by plants?

• Nitrates (NO3-) and Ammonium (NH4+)

• Nitrogen gas (N2) and Nitrites (NO2-)

• Organic nitrogen and Nitrogen gas (N2)

• Nitrites (NO2-) and Ammonia (NH3)

Multiple Choice

Which form of nitrogen makes up the majority of Earth's atmosphere, and why can't it be used directly by most organisms?

• Nitrogen gas (N2); because it is inert and must be converted by nitrogen-fixing bacteria

• Nitrates (NO3-); because it is only usable by plants

• Ammonia (NH3); because it is toxic to most organisms

• Nitrites (NO2-); because it is unstable

Multiple Choice

Which process in the nitrogen cycle involves the conversion of ammonia into nitrites and then into nitrates by bacteria?

• Nitrification

• Assimilation

• Ammonification

• Denitrification

Open Ended

Explain how plants and animals assimilate nitrogen and why this process is important for living organisms.

Multiple Select

Select all processes in the nitrogen cycle that involve bacteria as key agents.

• Nitrification

• Assimilation

• Ammonification

• Denitrification

Open Ended

How does the nitrogen cycle contribute to the health of an ecosystem?

Multiple Choice

Which of the following is NOT a process involved in the nitrogen cycle as shown in the diagram?

• Photosynthesis

• Nitrification

• Denitrification

• Ammonification