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Q.
When malic acid is the respiratory substrate
Uttarkhand PMTUttarkhand PMT 2010
Solution:
When organic acid such as malic acid $\left(C_{4} H_{6} O_{5}\right)$ is oxidised in respiration, the value of $R Q$ becomes more than one. It is because organic acids are rich in oxygen and require less oxygen for oxidation but release more carbon dioxide.