We need oxygen to breathe because it is essential for cellular respiration, the process by which our cells produce energy. Oxygen is used to break down glucose, creating energy that powers our cells and, by extension, our bodies. Without oxygen, our cells cannot produce energy efficiently, leading to cell damage or death.
Why do we need Oxygen?
MCQs
1. Why is oxygen important for our muscles?
A) It makes them look bigger
B) It helps them contract
C) It changes their color
D) It keeps them cold
2. What happens if our brain doesn’t get enough oxygen?
A) It grows bigger
B) We become more intelligent
C) We can feel confused or dizzy
D) It changes color
3. Which part of the air is oxygen?
A) 78%
B) 21%
C) 100%
D) 55%
4. How do plants help us get oxygen?
A) By taking in carbon dioxide
B) By releasing oxygen
C) Both A and B
D) By providing shade
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