Value of R.Q. in succulents is ____________.

Unity

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Infinite

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Less than unity

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Zero

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Solution

The correct option is D Zero
Succulents do not evolve carbon dioxide during the night (when their stomata are open) as the same is in carbon fixation. They also change carbohydrates to organic acids which utilise oxygen but do not evolve carbon dioxide.

${2 C}_{6} H_{12} O_{6} + {3 O}_{2} ⟶ {3 C}_{4} H_{6} O_{5} M a l i c a c i d + {3 H}_{2} O$
$R . Q . = \frac{Z e r o {C O}_{2}}{{3 O}_{2}} = Z e r o$
So the correct option is D.

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