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    NEET 2026 Preparation Tips for Chemistry, Biology and Physics

    Respiratory Quotient MCQ - Practice Questions with Answers

    Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET

    Quick Facts

    • 10 Questions around this concept.

    Solve by difficulty

    Which among the following has the least RQ?

    RQ of proteins, carbohydrates, fats, and organic acids are in order

    Concepts Covered - 1

    Respiratory Quotient
    • During aerobic respiration, O2 is consumed and CO2 is released. 
    • The ratio of the volume of CO2 evolved to the volume of O2 consumed in respiration is called the respiratory quotient (RQ) or respiratory ratio
       

    • The respiratory quotient depends upon the type of respiratory substrate used during respiration.
    • When carbohydrates are used as substrate and are completely oxidised, the RQ will be 1, because equal amounts of CO2 and O2 are evolved and consumed.
       

    • When fats are used in respiration, the RQ is less than 1. Calculations for fatty acid, tripalmitin, if used as a substrate is shown:

    • When proteins are respiratory substrates the ratio would be about 0.9.
    • When organic acids are used as the respiratory substrate, the R.Q is more than one.
       

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    Books

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    Respiratory Quotient

    Biology Textbook for Class XI

    Page No. : 236

    Line : 1

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