Why is oxygen essential for human life despite being much less abundant than nitrogen?
Answer and explanation
Correct answer: It is necessary for respiration
The governing concept is the functional role of atmospheric gases, not merely their percentage. Oxygen acts as the oxidising gas used in cellular respiration, where food molecules release usable energy for body functions. Therefore, option A is correct. Nitrogen is more abundant but is comparatively inactive in ordinary respiration; oxygen is not the main cloud nucleus, greenhouse gas, or dust-removing agent.
Frequently asked questions
What is the correct answer to this question?
It is necessary for respiration
Why is this the correct answer?
The governing concept is the functional role of atmospheric gases, not merely their percentage. Oxygen acts as the oxidising gas used in cellular respiration, where food molecules release usable energy for body functions. Therefore, option A is correct. Nitrogen is more abundant but is comparatively inactive in ordinary respiration; oxygen is not the main cloud nucleus, greenhouse gas, or dust-removing agent.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Theory Base of Accounting.
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