LIFE SCIENCE

OBJECTIVE LIFE SCIENCE

ECOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following represents a step in the nitrogen cycle?
A
Nitrogen-fixing bacteria convert atmospheric nitrogen to nitrates.
B
Nitrites bind to soil particles.
C
Nitrogen-fixing bacteria convert atmospheric nitrogen to ammonia.
D
Denitrifiers convert ammonium to atmospheric nitrogen.
Explanation: 

Detailed explanation-1: -Ammonification. When an organism excretes waste or dies, the nitrogen in its tissues is in the form of organic nitrogen (e.g. amino acids, DNA). Various fungi and prokaryotes then decompose the tissue and release inorganic nitrogen back into the ecosystem as ammonia in the process known as ammonification.

Detailed explanation-2: -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.

Detailed explanation-3: -The steps, which are not altogether sequential, fall into the following classifications: nitrogen fixation, nitrogen assimilation, ammonification, nitrification, and denitrification.

Detailed explanation-4: -Rhizobium: Rhizobium is the nitrogen fixing bacteria which are present in the root nodules of the leguminous plants. It converts atmospheric nitrogen to ammonia, nitrates or nitrites.

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