Why do we need to exchange oxygen and carbon dioxide?

We need $C O_{2}$ to breakdown glucose, of which oxygen is a by-product.

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We need oxygen to break down glucose, of which $C O_{2}$ is a by-product.

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We need $C O_{2}$ to breathe and produce oxygen as a by-product.

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We need oxygen to breathe and produce $C O_{2}$ as a by-product.

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Solution

The correct option is B
We need oxygen to break down glucose, of which $C O_{2}$ is a by-product.

Cellular respiration is a process of breaking down of glucose with the help of oxygen to produce $C O_{2}, H_{2} O$ and energy. Hence, we breathe in order to take in oxygen and give out the carbon dioxide that is continuously being formed.

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