Nitrogen makes up approximately 78% of the Earth’s atmosphere by volume. This vast majority ensures that the atmosphere is stable and not overly reactive. While nitrogen is essential for life, particularly in the formation of proteins and DNA, it remains largely inert in its gaseous form. It serves as the primary component of the air we breathe every single day. ANSWER: (B) 78%
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Nitrogen is the most abundant gas in the atmosphere, constituting approximately 78% of the total air volume. This high percentage is a result of nitrogen’s chemical stability, as it does not easily react with other elements under normal conditions. It acts as a crucial diluent for oxygen, preventing rapid combustion and maintaining a balanced environment. Although humans and animals cannot absorb nitrogen directly from the air, it is converted into usable forms by nitrogen-fixing bacteria in the soil. This nitrogen cycle is vital for plant growth and the survival of all living organisms within the global biosphere.
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