Nitrogen Cycle

Front

What is nitrogen fixation?

Back

The process of converting nitrogen gas (N2) from the atmosphere into a usable form for plants, primarily through the action of bacteria and lightning.

Front

What percentage of the Earth's atmosphere is nitrogen?

Back

Approximately 79%.

Front

Which organisms are primarily responsible for converting nitrogen gas into a usable form?

Back

Bacteria, particularly nitrogen-fixing bacteria.

Front

How do animals obtain the nitrogen they need?

Back

Animals obtain nitrogen by consuming plants or other animals that contain nitrogen.

Front

Describe a correct sequence of the nitrogen cycle.

Back

Air (nitrogen gas) -> Bacteria (nitrogen fixation) -> Plants (absorption of nitrates) -> Animals (consumption of plants).

Front

What role do lightning strikes play in the nitrogen cycle?

Back

Lightning strikes can convert nitrogen gas in the atmosphere into nitrates, which are then deposited into the soil.

Front

What is the significance of nitrates for plants?

Back

Nitrates are a form of nitrogen that plants can absorb and use to synthesize proteins and nucleic acids.

Front

What happens to nitrogen in the soil after plants die?

Back

Decomposers break down the organic matter, returning nitrogen to the soil in the form of ammonium or nitrates.

Front

What is denitrification?

Back

The process by which bacteria convert nitrates back into nitrogen gas, releasing it into the atmosphere.

Front

Why is nitrogen important for living organisms?

Back

Nitrogen is a key component of amino acids, proteins, and nucleic acids, which are essential for life.