Question

Arrange the RQ value of following respiratory substrates in ascending order
(a) $C_4{H}_6{O}_5$
(b) $C_6{H}_{12}{O}_6$
(c) $C_{1}8H_{36}{O}_2$
(d) Succulents (night)

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

Answer 1

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 C${}_4$H${}_6$O${}_5$ is 1.3 (it is malic acid)

RQ for C${}_6$H${}_{12}$O${}_6$ is 1 (it is glucose)

RQ for C${}_{18}$H${}_{36}$O${}_2$ 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 C${}_{18}$H${}_{36}$O${}_2$), 1 (for C${}_6$H${}_{12}$O${}_6$) and 1.3 (for C${}_4$H${}_6$O${}_5$)

Hence, the correct answer is '(d), (c), (b) and (a)'