Consider the following about Nitrogen 1 Nitrogen is a necessary component of bio molecules such as p......

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Consider the following about Nitrogen.

1.Nitrogen is a necessary component of bio-molecules such as proteins, DNA and chlorophyll.

2.It is a scarce resource often limiting primary productivity in many ecosystems because it is largely inaccessible as di-nitrogen gas to most organisms.

3.Nitrification, denitrification and ammonification are important parts of the Nitrogen cycle.

4.Prokaryotes cannot fix nitrogen due to absence of cellular structures that facilitate swift gaseous exchange from the atmosphere.

Select the correct answer using the codes below.

1, 2 and 3 only

2 and 3 only

2, 3 and 4 only

1 and 4 only

Explanation:

Statement 1: Nitrogen is a crucial part of amino acids that are responsible behind several structures in the body of living beings.
Statement 2: Nitrogen gas (N2) makes up nearly 80% of the Earth's atmosphere, yet nitrogen is often the nutrient that limits primary production in many ecosystems. Because plants and animals are not able to use nitrogen gas in that form.
For nitrogen to be available to make proteins, DNA, and other biologically important compounds, it must first be converted into a different chemical form. The process of converting N2 into biologically available nitrogen is called nitrogen fixation.
The nitrogen cycle is of particular interest to ecologists because nitrogen availability can affect the rate of key ecosystem processes, including primary production and decomposition.
Statement 4: N2 gas is a very stable compound due to the strength of the triple bond between the nitrogen atoms, and it requires a large amount of energy to break this bond. The whole process requires eight electrons and at least sixteen ATP molecules.
As a result, only a select group of prokaryotes are able to carry out this energetically demanding process. Although most nitrogen fixation is carried out by prokaryotes, some nitrogen can be fixed abiotically by lightning or certain industrial processes, including the combustion of fossil fuels.