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(D) At the compensation point,the rate of photosynthesis is equal to the rate of respiration.Consequently,the net volume of $O_2$ absorbed from the at

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Zero

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(D) At the compensation point,the rate of photosynthesis is equal to the rate of respiration.Consequently,the net volume of $O_2$ absorbed from the atmosphere is zero,and the net volume of $CO_2$ evolved into the atmosphere is zero.Since the Respiratory Quotient $(RQ)$ is defined as the ratio of the volume of $CO_2$ evolved to the volume of $O_2$ absorbed,at the compensation point,it becomes:$RQ = \frac{	ext{Vol. of } CO_2 	ext{ evolved}}{	ext{Vol. of } O_2 	ext{ absorbed}} = \frac{0}{0} = 0$.

The value of $RQ$ at compensation point is

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