R.Q. is zero, when the respiratory substrate is

Completely oxidized

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Incompletely oxidized

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Not oxidized at all

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Reduced

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Solution

The correct option is B Incompletely oxidized
Respiratory quotient is the ratio, which defined as the ratio between $C O_{2}$ eliminated to that of $O_{2}$ consumed. When respiratory substrate is incompletely oxidized the value of R.Q. = 0. In succulent plants like Opuntia the carbohydrate is incompletely oxidized and do not produce any $C O_{2}$ . So, $C O_{2}$ / $O_{2}$ = 0 / no. of $O_{2}$ = 0.

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