Question

When plant and animal decay, the organic N is converted into inorganic N. The inorganic N is in the form of:
A. $N{H_3}$
B. Element of N
C. Nitrates
D. Nitrides

Answer 1

Hint: Inorganic substances are those which are not present in living bodies and also not present in plants and microbes. The process which converts organic substance into inorganic substance during decay of plant or animal is known as ammonification.

Step by step answer: Organic nitrogen is present in the living cells in the form of protein and peptide. When these proteins in living cells die then they decay and after decay they form ammonia ($N{H_3}$) and this process is known as ammonification. Ammonia ($N{H_3}$) is an inorganic form of N. Because this ammonia is not present in living bodies and it is really very poisonous for our calls so it is inorganic in nature. N is present in our body in the form of urea whose formula is$N{H_2}CON{H_3}$. This ammonia ($N{H_3}$) gets converted in the form of $NO_2^ - $ and after that they get converted into $NO_3^ - $ . And after that this nitride ($NO_3^ - $) gets converted into nitrogen gas which process is known as denitrification. And this nitrogen gas present in the atmosphere again gets used by living bodies, plants etc which is used for proteins and hence this process or cycle keeps on working again and again.
So from the above discussion we come to know that during plant and animal decay the organic nitrogen converts into $N{H_3}$ which is an inorganic and toxic substance.

So the correct option is $N{H_3}$ that is A option.

Note: Ammonia ($N{H_3}$) is a really very toxic substance for the human body that is why it is not present in living bodies, plants or microbes. This whole process occurs again and again like a cycle. The process of conversion of organic into inorganic substance is known as ammonification