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 breakdown 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 byproduct of digestion.

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We need oxygen to breathe and produce

C O_{2}

as a byproduct of digestion.

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Solution

The correct option is B We need oxygen to breakdown 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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