GK
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Hydrogen
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Nitrogen
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Oxygen
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Carbon dioxide
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Detailed explanation-1: -The most abundant naturally occurring gas is nitrogen (N2), which makes up about 78% of air. Oxygen (O2) is the second most abundant gas at about 21%. The inert gas argon (Ar) is the third most abundant gas at 0.93%.
Detailed explanation-2: -Nitrogen is more in the air because it is least reactive and nitrogen is generated and maintained in this natural equilibrium by plants and surface soil bacteria, who convert it to ammonium, nitrites, and nitrates before releasing it as free nitrogen back into the atmosphere.
Detailed explanation-3: -Dinitrogen is the most common form. It makes up 78 percent of the atmosphere but cannot be used by plants. It is taken into the soil by bacteria, some algae, lightning, and other means.