Ncert Exercises & Solutions

11. Different substrates get oxidised during respiration. How does Respiratory Quotient (RQ) indicate which type of substrate, i.e., carbohydrate, fat or protein is getting oxidised ?

R.Q. = $\frac{A}{B}$

What do A and B stand for? What type of substrates have R.Q. of 1, < 1 or > 1 ?

Theratio of CO₂ evolved and consumption of O₂ in respiration is called the Respiratory Quotient (RQ) or respiratory ratio.

R.Q. =

\frac{A}{B} = \frac{Volume of {CO}_{2} evolved}{Volume of O_{2} consumed}

Substrates like carbohydrates have RQ =1 during, aerobic respiration.

Proteins and fats have RQ of < 1 and it occurs during germination of seeds.

Substrates like organic acids have RQ of > 1 under aerobic conditions.

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