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Question

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


A

I - carbon dioxide, II - oxygen

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B

I - oxygen, II - respiration

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C

I - respiration, II - carbon dioxide

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D

I - respiration, II - oxygen

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Solution

The correct option is C

I - respiration, II - carbon dioxide


During photosynthesis, plants release oxygen which is taken in by human beings and animals for respiration. Carbon dioxide is released as a byproduct of respiration. This is in turn used up by plants for photosynthesis.


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