Exploring the Nitrogen Cycle Processes

The video tutorial explains the nitrogen cycle, detailing the flow of nitrogen through ecosystems. It covers inorganic and organic forms of nitrogen, the role of plants and animals, and the processes of ammonification, nitrification, and denitrification. The importance of nitrogen fixation by bacteria in legumes is highlighted, along with the role of decomposers. The tutorial concludes with study tips for mastering the nitrogen cycle.

What do the squares in the nitrogen cycle diagram represent?

• Water molecules

• Carbon compounds

• Inorganic forms of nitrogen

• Organic forms of nitrogen

What is the first transformation that ammonium ions undergo in the nitrogen cycle?

• Conversion to nitrogen gas

• Conversion to proteins

• Conversion to nitrate

• Conversion to nitrite

Which form of nitrogen is most easily absorbed by plants?

• Nitrogen gas

• Ammonium ions

• Nitrites

• Nitrates

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What are the main nitrogen-containing compounds in plants?

• Lipids and vitamins

• Water and minerals

• Carbohydrates and fats

• Proteins and DNA

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How do animals obtain nitrogen?

• By absorbing it from the air

• By eating plants

• By drinking water

• By photosynthesis

What is the role of decomposers in the nitrogen cycle?

• They break down dead organic matter

• They convert nitrogen gas to nitrates

• They fix nitrogen in the soil

• They absorb nitrogen from the air

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What is the process of converting nitrogen gas into a form usable by plants called?

• Nitrogen fixation

• Denitrification

• Ammonification

• Nitrification

Which bacteria are involved in the process of nitrification?

• Nitrosomonas and Nitrobacter

• Lactobacillus and Streptococcus

• Rhizobium and Azotobacter

• E. coli and Salmonella

Under what conditions does denitrification usually occur?

• Anaerobic conditions

• Aerobic conditions

• Low pH

• High temperature

What is the term for the digestion or decay of dead organic matter by extracellular enzymes?

• Nitrification

• Ammonification

• Saprotrophic nutrition

• Nitrogen fixation

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