Which of the choices can best fill in the boxes I and II given below?

I - Carbon dioxide, II - Oxygen

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I - Oxygen, II - Respiration

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I - Respiration, II - Carbon dioxide

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I - Respiration, II - Oxygen

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Solution

The correct option is C I - Respiration, II - Carbon dioxide
During photosynthesis in plants, oxygen is released which is taken in by human beings and animals for respiration. They in turn release carbon dioxide needed for photosynthesis by plants.
For combustion, oxygen is used and carbon dioxide is released.

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