Question

Which of the following natural processes play(s) a role in the nitrogen cycle?
(A) Lightning
(B) Flood
(C) Storm
(D) All of these

Answer 1

Hint :The nitrogen cycle is a cycle that includes many stages in the system. The nitrogen cycle is considered as the biogeochemical cycle in which nitrogen is converted into different chemical forms and circulates among atmosphere, terrestrial and marine ecosystems. Lightning, flood, and storm are natural processes that occur due to the interaction of organisms and the environment.

Complete Step By Step Answer:
First, we will discuss the nitrogen cycle and its purpose. We know that nitrogen is the most plentiful element in our earth’s atmosphere. It is considered the basic constituent of matter. Now we will start discussing the stages of the nitrogen cycle and then we will predict which natural process plays an important role in it. So generally there are five stages or steps in the nitrogen cycle. The first step of the nitrogen cycle is nitrogen fixation. In this process, elemental nitrogen is converted to ammonia without using any chemical processes. The reaction is $ {N_2} \to N{H_3} $ . The second stage is nitrification in this step ammonia is converted to nitrate $ N{O^{3 - }} $ . The third stage is Assimilation in which nitrogen and ammonia are incorporated so that animals can utilize it. The fourth stage is ammonification and the last step is denitrification. At last, we obtained the gaseous nitrogen, and then again the same cycle repeats.
The first step of the nitrogen cycle is also known as atmospheric nitrogen fixation and this takes place only when the electrical discharge of lightning combines oxygen and nitrogen present in our atmosphere.
Therefore, the correct option is (A).

Note :
The nitrogen cycle is important as it is the requirement of many plant cells and for processes like DNA and amino acids. Nitrogen is the basic component of proteins and nucleic acids. Diatomic nitrogen gas is extremely stable.