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Respiratory quotient (R.Q.) is defined a...

Respiratory quotient (R.Q.) is defined as the ratio of a volume of `CO_2` evolved to the volume of `O_2` taken in during the respiration process. Value of R.Q. depends on the nature of respiratory substrate and to the extent to which this substance is broken down into simpler products. Which of the following situation will give us the R.Q. value as infinity when alcohol is produced?

A

Fats used as substrate under aerobic conditions .

B

Organic acid is used as a substrate under aerobic conditions.

C

Carbohydrate substrate used under anaerobic conditions.

D

Any type to substrate used under aerobic conditions.

Text Solution

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To solve the question regarding the respiratory quotient (R.Q.) and the conditions under which it can be infinite during the production of alcohol, we will follow these steps: ### Step-by-Step Solution: 1. **Understanding Respiratory Quotient (R.Q.):** - R.Q. is defined as the ratio of the volume of carbon dioxide (CO₂) produced to the volume of oxygen (O₂) consumed during respiration. - Mathematically, R.Q. = CO₂ evolved / O₂ consumed. 2. **R.Q. Values for Different Substrates:** - Carbohydrates: R.Q. = 1 (complete oxidation) - Fats: R.Q. = 0.7 (less CO₂ produced relative to O₂ consumed) - Proteins: R.Q. = 0.9 - Organic acids: R.Q. can be greater than 1. 3. **Condition for Infinite R.Q.:** - An infinite R.Q. occurs when the volume of O₂ consumed approaches zero, while CO₂ production continues. This situation typically arises during anaerobic respiration, where no oxygen is used. - In the context of fermentation, especially in the production of alcohol (ethanol), the process does not require oxygen. 4. **Fermentation Process:** - During fermentation, glucose is converted into ethanol and carbon dioxide. The reaction can be summarized as: \[ C_6H_{12}O_6 \rightarrow 2 C_2H_5OH + 2 CO_2 \] - Here, glucose is broken down anaerobically, producing carbon dioxide without consuming oxygen. 5. **Conclusion:** - Since fermentation does not utilize oxygen, the volume of O₂ consumed is effectively zero, while CO₂ is produced. Therefore, the R.Q. becomes infinite. - The correct situation that leads to an infinite R.Q. when alcohol is produced is when carbohydrates are used as substrates under anaerobic conditions. ### Final Answer: The situation that will give us the R.Q. value as infinity when alcohol is produced is **carbohydrate substrate used under anaerobic conditions**. ---
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R.Q. Value is an infinity during Aerobic respiration of carbohydrates as substrate Aerobic respiration of proteins as substrate Aerobic respiration of fats as substrate Anaerobic respiration of carbohydrates as substrate

Assertion (A). RQ value for fats is less than one. Reason (R). The amount of CO_(2) released is less than O_(2) consumed when fats are used in respiration

Knowledge Check

  • If volume of CO_(2) liberated during respiration is more than the volume of O_(2) used, then the respiratory substrate will be

    A
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    B
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    C
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    D
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