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Q.
During starvation, $RQ$ value will be
NTA AbhyasNTA Abhyas 2020
Solution:
The respiratory quotient (RQ) of respiration is the ratio of volume of carbon dioxide liberated during respiration to the volume of oxygen absorbed or consumed to evolve that amount of CO2. Depending on the respiratory substrate, there are four possibilities of this RQ value, like
1. The RQ is 1, when glucose is respired.
$C_{6}H_{12}O_{6}+6O_{2} \rightarrow 6CO_{2}+6H_{2}O+ATP$
$\frac{6 C O_{2}}{6 O_{2}}=1$
2. The RQ is less than 1 and is nearly 0.71 when a triglyceralide is respired and is nearly 0.7 to 0.9 when protein is respired.
$C_{57}H_{104}O_{2}\left(\right.Fat\left.\right)+80O_{2} \rightarrow 57CO_{2}+52H_{2}O\frac{57 C O_{2}}{80 O_{2}}=0.71$
3. The RQ is more than 1 when some organic acid is respired.
$2C_{2}H_{2}O_{4}\left(\right.Oxalicacid\left.\right)+O_{2} \rightarrow 4CO_{2}+2H_{2}O\frac{4 C O_{2}}{1 O_{2}}=4$
4. The RQ is infinity when anaerobic respiration is taking place.
During starvation, the carbohydrate is not available and thus fat and proteins are respired. This makes the RQ fall below 1.