In succulent plants like Opuntia, the RQ valu | vedclass

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(D) Respiratory quotient $(RQ)$ is defined as the ratio of the volume of carbon dioxide $(CO_2)$ evolved to the volume of oxygen $(O_2)$ consumed duri

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(D) Respiratory quotient $(RQ)$ is defined as the ratio of the volume of carbon dioxide $(CO_2)$ evolved to the volume of oxygen $(O_2)$ consumed during respiration.In succulent plants like $Opuntia$, the stomata remain closed during the day to prevent water loss. During the night, they take in $CO_2$ and store it as organic acids (like malic acid). During the day, these organic acids are decarboxylated to release $CO_2$, which is then used in photosynthesis.Because no $CO_2$ is released into the atmosphere during the respiration process in these plants, the volume of $CO_2$ evolved is $0$.Therefore, $RQ = \frac{	ext{Volume of } CO_2 	ext{ evolved}}{	ext{Volume of } O_2 	ext{ consumed}} = \frac{0}{O_2} = 0$.

In succulent plants like $Opuntia$, the $RQ$ value will be

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$(d) \text{Succulents (night)}$

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