ECOLOGY
CHEMICAL CYCLES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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plants convert nitrogen gas into a usable form
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animals convert nitrogen in the air into a usable form
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bacteria convert the nitrogen gas in the air into nitrites or nitrates
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bacteria convert the nitrogen containing compounds into nitrogen gas
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Detailed explanation-1: -Nitrogen-fixing bacteria in the soil and within the root nodules of some plants convert nitrogen gas in the atmosphere to ammonia. Nitrifying bacteria convert ammonia to nitrites or nitrates. Ammonia, nitrites, and nitrates are all fixed nitrogen and can be absorbed by plants.
Detailed explanation-2: -The symbiotic nitrogen-fixing bacteria invade the root hairs of host plants, where they multiply and stimulate formation of root nodules, enlargements of plant cells and bacteria in intimate association. Within the nodules the bacteria convert free nitrogen to ammonia, which the host plant utilizes for its development.
Detailed explanation-3: -Denitrification. Denitrification is the process that converts nitrate to nitrogen gas, thus removing bioavailable nitrogen and returning it to the atmosphere.
Detailed explanation-4: -Our results support the idea that nitrate is converted to nitrite and then to other reduced nitrogen biomolecules such as NO, ammonia, urea and possibly nitrogen gas by bacteria in the saliva, stomach, small and large intestine.
Detailed explanation-5: -Denitrification. Denitrification completes the nitrogen cycle by converting nitrate (NO3-) back to gaseous nitrogen (N2). Denitrifying bacteria are the agents of this process. These bacteria use nitrate instead of oxygen when obtaining energy, releasing nitrogen gas to the atmosphere.