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Question

Arrange the RQ value of following respiratory substrates in ascending order
(a) C4H6O5
(b) C6H12O6
(c) C18H36O2
(d) Succulents (night)

A
(c),(b),(d) and (a)
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B
(d),(c),(b) and (a)
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C
(b),(c),(a) and (d)
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D
(c),(b),(a) and (d)
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Solution

The correct option is B (d),(c),(b) and (a)
The respiratory quotient is the ratio of the volume of carbon dioxide produced to the volume of oxygen consumed over the period of time in respiration.
RQ for C4H6O5 is 1.3 (it is malic acid)
RQ for C6H12O6 is 1 (it is glucose)
RQ for C18H36O2 is 0.7 (it is stearic acid)
RQ for succulents at night is 0 because their stomata are closed and no carbon dioxide is released also no oxygen enters.
in ascending order, the RQ can be arranged as 0 (for succulents at night), 0.7 (for C18H36O2), 1 (for C6H12O6) and 1.3 (for C4H6O5)
Hence, the correct answer is '(d), (c), (b) and (a)'

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