Nitrogen Cycle quiz
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What are seabird droppings sold as fertilizer called?
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More questions about Nitrogen Cycle
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Where do fertilizer factories get their nitrogen?
Answer: Air
Why: Factories react nitrogen from the air with hydrogen, usually taken from natural gas, to make ammonia.
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Who won the 1918 Chemistry Nobel for making ammonia?
Answer: Fritz Haber
Why: Carl Bosch, who scaled Haber's method up to factory size at BASF, won his own Chemistry Nobel in 1931.
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Which bacterial genus forms nodules on alder roots?
Answer: Frankia
Why: Frankia is a filamentous actinobacterium rather than a typical rod, partnering with woody shrubs instead of legumes.
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What human activity releases the most laughing gas?
Answer: Farming
Why: Fertilizer and manure feed soil bacteria, which give off laughing gas as a by-product while converting the added nitrogen.
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What do nitrogen-fixing bacteria turn nitrogen gas into?
Answer: Ammonia
Why: Nitrate comes later: other soil bacteria make it from ammonia in a two-step process called nitrification.
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Which free-living aerobic bacterium fixes nitrogen in soil?
Answer: Azotobacter
Why: Azotobacter survives aerobically by consuming oxygen so quickly through respiration that internal levels stay near zero.
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