$C O_{2}$ concentration has which type of relation with respiration?

Directly proportional

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Inversely proportional

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Both (A) and (B)

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No relation

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Solution

The correct option is C Inversely proportional
Increase in carbon dioxide concentration of the atmosphere increases respiration rate up to some extent, as it supplies more substrate for respiration. Excessive amount of carbon dioxide may inhibit or reduce the respiration rate due to closure of stomata. Closure of stomata leads to inhibition of oxygen diffusion in cells.

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