Nitrogen Cycle Notes



Why do plants and animals need nitrogen (N)?To build protein moleculesWhat molecule in the atmosphere is nitrogen normally found in? N2What molecule in the ground is nitrogen found when there is no oxygen around? NH3What molecule in the ground is nitrogen found when there is oxygen around? NO3What organic molecule in nitrogen found in? Amino acids, proteinsWhat are two ways that atmospheric nitrogen gets into the ground? Nitrogen – fixing bacteria, lightningWhat organisms (living things) do the nitrogen fixation for plants? BacteriaWhy don’t farmers have to put nitrogen fertilizer on soybeans?Soybeans are legumes; have nitrogen-fixing bacteriaWhere do plants get their nitrogen? The ground (NO3)How do primary consumers get their nitrogen? By eating plant proteinHow do secondary consumers get their nitrogen? By eating animal proteinWhat is another term for primary consumer? HerbivoreWhat is another term for a secondary consumer? CarnivoreWhere does a plant’s or animal’s nitrogen go when it dies? The ground, after bacteria decompose the organismWhat breaks the dead organism’s body back into inorganic nitrogen?BacteriaHow does extra nitrogen get into our water ecosystems (rivers, estuaries, MS Sound)?Burning fossil fuels, Sewage (animal or human waste), Decay, FertilizersWhy is extra nitrogen in the Gulf of Mexico a problem? Extra nitrogen causes algal bloomsAlgae blocks sunlight for photosynthesisWhen the algae dies, bacteria use up the oxygen when it breaks it down (eutrophication) ................
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