Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Nitrogen Cycle Biology 20 Nitrogen Cycle • Nitrogen cycle: cycling of nitrogen between organisms and environment. • Nitrogen fixation: process of converting nitrogen gas into nitrates and ammonium ions. – Nitrogen-fixing bacteria: bacteria grow in root nodules of legumes. – Examples are: clover, alfalfa – This can then be used by plants. Nitrogen Fixing Bacteria • What kind of lawns would you find an abundance of clover? A lawn high in nitrates or low in nitrates? Explain. Nitrogen Cycle • Denitrifying bacteria: break down nitrates/nitrites into nitrogen gas. – This nitrogen gas re-enters the atmosphere. – Denitrifying bacteria work best in an anaerobic environment (no air). • THOUGHT Question: Why do people aerate their lawns in the spring? How does this help their lawns? Explain. Decaying • When plants and animals decay they are turned in to ammonia, then into nitrites and finally into nitrates. • These nitrates re-enter the cycle. • Question: What organisms are important to the decaying process? Lightning • Lightning: Creates nitric acid by reacting with nitrogen gas in the air.