Respond to the statements 100–104 with reference to the four

steps of the nitrogen cycles listed below.
a. nitrogen fixation
b. nitrification
c. denitrification
d. ammonification
M 100. The action of bacteria on nitrogen-containing wastes
involves this process.
M 101. The action of bacteria on ammonia, ultimately
converting it to nitrate, involves this process.
E 102. The action of bacteria on nitrates, converting them to
gaseous nitrogen, involves this process.
E 103. The conversion of gaseous nitrogen first to ammonia
and then to other nitrogenous compounds involves
this.
E 104. The process whereby nitrite is converted to nitrate is
an important part of this process.


Answers: 101. d, 102. b, 103. c, 104. a, 105. b

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