The Question is from neet-botany , and it was created by the author B VENKAT

Question

Select the correct option w.r.t. increasing order  of respiratory quotient of various substrates.

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: [A]
## CONCEPT FRAMEWORK
**Primary Concept**: Respiratory Quotient (RQ)
**Related Topics**: Cellular Respiration, Substrate Oxidation, Stoichiometry
**Prerequisites**: Basic knowledge of cellular respiration and the concept of RQ.
## SOLUTION PATHWAY
**Given Information**:
    The question requires ordering different substrates based on their Respiratory Quotient.
    RQ is defined as the ratio of CO2 produced to O2 consumed.
**Method & Steps**:
1. **Understanding RQ Values**: Recall that the RQ value varies depending on the substrate being metabolized. Carbohydrates have an RQ of around 1.0, fats have an RQ of around 0.7, and proteins have an RQ of about 0.8. Organic acids like oxalic acid have an RQ greater than 1.0.
   Reasoning: This is based on the stoichiometry of oxidation of different molecules.
   Formula/Rule: RQ = (Moles of CO2 produced) / (Moles of O2 consumed)
2. **RQ Values for Substrates**: 
    - Fats have an RQ around 0.7
    - Proteins have an RQ around 0.8
    - Oxalic acid has an RQ greater than 1.0 (due to high oxygen content of the molecule).
3. **Ordering**: Comparing the RQ values, the correct increasing order is Fats < Protein < Oxalic acid.
   Result: The correct order is Fats < Protein < Oxalic acid.
   Verification: This aligns with the typical RQ values for different substrates.
## OPTION ANALYSIS
[A] ✓: This option correctly represents the increasing order of respiratory quotient: Fats (0.7) < Protein (0.8) < Oxalic acid (>1.0).
[B] :x: Malic acid has an RQ closer to 1.33, which is higher than oxalic acid and fats is incorrect.
[C] :x: This option puts protein before fat, which is incorrect, and also places malic acid with the lowest RQ, which is also not correct.
[D] :x: This order incorrectly places oxalic acid first and protein before malic acid.
## LEARNING AIDS
**Common Mistakes**:
1. **Misremembering RQ values**: Forgetting the general RQ values for fats, proteins, and carbohydrates can lead to incorrect ordering. Use mnemonic devices or practice questions to remember them.
2. **Misunderstanding the concept**: Not understanding the underlying concept of RQ and its relation to the chemical composition of substrates.
**Quick Tips**:
1. **RQ of 1 for Carbs**: Remember that carbohydrates generally have an RQ of 1, which can be a reference point for other substrates.
2. **Fat RQ Lower**: Fats have lower RQ because they are more reduced and require more O2 for complete oxidation.

B VENKAT · Answer

The correct Option is "Fats < Protein < Oxalic acid"

B VENKAT · Answer

Malic acid < Oxalic acid < Fat

B VENKAT · Answer

Protein < Fat < Malic acid

B VENKAT · Answer

Oxalic acid < Protein < Malic acid

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