The Question is from neet-botany respiration-in-plants , and it was created by the author Mr. NARESH KUMAR K

Question

Which of the following substrates would have an RQ value greater than 1?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION ✓ **Answer**: C ## CONCEPT FRAMEWORK **Primary Concept**: Respiratory Quotient (RQ) **Related Topics**: Aerobic Respiration, Anaerobic Respiration, Metabolism, Carbohydrates, Lipids, Organic Acids **Prerequisites**: Understanding of chemical equations for respiration of different substrates. ## SOLUTION PATHWAY **Given Information**: Substrates: Palmitic acid, Glucose, Malic acid, Alanine RQ > 1 **Method & Steps**: 1. **Recall the definition of RQ**: RQ = $\frac{ ext{Volume of } CO_2 ext{ produced}}{ ext{Volume of } O_2 ext{ consumed}}$ Reasoning: The RQ value depends on the relative amounts of carbon and oxygen in the substrate being oxidized. 2. **Consider the oxidation of malic acid**: $C_4H_6O_5 + 3O_2 ightarrow 4CO_2 + 3H_2O$ Working: RQ for malic acid = $\frac{4}{3}$ ≈ 1.33 Key Point: When a substrate is more oxidized (like malic acid compared to glucose), less oxygen is required for its complete oxidation to $CO_2$ and $H_2O$, resulting in an RQ > 1. 3. **Compare with other substrates**: RQ for carbohydrates is typically 1, for lipids it's less than 1 (around 0.7), and for proteins it's around 0.8-0.9. Result: Malic acid has an RQ greater than 1. Verification: The calculated RQ for malic acid (1.33) is greater than 1, confirming the correct answer. ## OPTION ANALYSIS [A] :x: Palmitic acid (a lipid): Lipids have a lower RQ (< 1) because they require more oxygen for complete oxidation due to their higher proportion of hydrogen. [B] :x: Glucose (a carbohydrate): Glucose has an RQ of approximately 1 ($C_6H_{12}O_6 + 6O_2 ightarrow 6CO_2 + 6H_2O$). [C] ✓: Malic acid (an organic acid): Malic acid has an RQ greater than 1 because it is already partially oxidized, requiring less oxygen for complete oxidation. [D] :x: Alanine (an amino acid): Amino acids have an RQ of approximately 0.8-0.9. ## LEARNING AIDS **Common Mistakes**: 1. Confusing RQ with the inverse ratio: Make sure to remember RQ is $CO_2$ produced/$O_2$ consumed, not the other way around. 2. Not considering the oxidation state of the substrate: The degree of oxidation of the substrate is crucial for determining the RQ. **Quick Tips**: 1. Substrates with more oxygen relative to carbon will have a higher RQ. 2. Remember the approximate RQ values for carbohydrates (1), lipids (<1), and proteins (around 0.8-0.9).

Mr. NARESH KUMAR K · Answer

Palmitic acid

Mr. NARESH KUMAR K · Answer

Glucose

Mr. NARESH KUMAR K · Answer

The correct Option is "Malic acid"

Mr. NARESH KUMAR K · Answer

Alanine

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