Why is oxygen essential for life even though it is less abundant than nitrogen?
Answer and explanation
Correct answer: Because it is directly used in respiration
The governing idea is that abundance and biological importance are different measures. Oxygen is directly used by most aerobic organisms in cellular respiration, where food molecules are broken down to release usable energy. Nitrogen is more abundant but is not directly used as the main respiratory gas by humans and most animals. Therefore option A is correct; the other choices misidentify oxygen as inert, dust, or salt.
Frequently asked questions
What is the correct answer to this question?
Because it is directly used in respiration
Why is this the correct answer?
The governing idea is that abundance and biological importance are different measures. Oxygen is directly used by most aerobic organisms in cellular respiration, where food molecules are broken down to release usable energy. Nitrogen is more abundant but is not directly used as the main respiratory gas by humans and most animals. Therefore option A is correct; the other choices misidentify oxygen as inert, dust, or salt.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Introduction to Accounting. Topic: Meaning & Definition.
