ESS
Grade-6
Easy
Question
What is the percentage of oxygen in air?
- 20%
- 21%
- 78%
- 70%
Hint:
The most abundant gas is nitrogen which is 78%.
The correct answer is: 21%
The correct option is b)21%
It's a mixture of different gases. The air in Earth's atmosphere is composed of approximately 78% nitrogen and 21% oxygen. Air also contains small amounts of other gases such as carbon dioxide, neon, and hydrogen. Tiny organisms known as cyanobacteria, or blue-green algae. These microorganisms carry out photosynthesis. It uses sunlight, water and carbon dioxide to produce carbohydrates and oxygen.
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