Practice questions on respiratory quotient and the factors that influence respiration rates, such as temperature, oxygen levels, and substrate availability.
During aerobic respiration, a total of 6 CO₂ molecules are released per glucose molecule, two from pyruvate oxidation and four from the Krebs cycle.
Ref: NCERT Class 11 Biology Chapter 12: Respiration in Plants Respiratory Quotient and Factors Affecting Respiration
The Krebs cycle takes place in the mitochondrial matrix, where Acetyl-CoA is oxidized to produce ATP, NADH, and FADH₂.
Ref: NCERT Class 11 Biology Chapter 12: Respiration in Plants Respiratory Quotient and Factors Affecting Respiration
One molecule of ATP (or GTP) is directly synthesized per turn of the Krebs cycle through substrate-level phosphorylation.
Ref: NCERT Class 11 Biology Chapter 12: Respiration in Plants Respiratory Quotient and Factors Affecting Respiration
Oxygen serves as the final electron acceptor in the Electron Transport Chain, forming water.
Ref: NCERT Class 11 Biology Chapter 12: Respiration in Plants Respiratory Quotient and Factors Affecting Respiration
Acetyl-CoA acts as a central metabolic intermediate, linking the breakdown of carbohydrates, lipids, and proteins.
Ref: NCERT Class 11 Biology Chapter 12: Respiration in Plants Respiratory Quotient and Factors Affecting Respiration
Plants require oxygen for respiration, but they do not have specialized respiratory organs due to lower energy needs and efficient gas diffusion.
Ref: NCERT Class 11 Biology Chapter 12: Respiration in Plants Respiratory Quotient and Factors Affecting Respiration
The Krebs cycle does not use glucose directly; glucose is first broken down into pyruvate, which is then converted into Acetyl-CoA.
Ref: NCERT Class 11 Biology Chapter 12: Respiration in Plants Respiratory Quotient and Factors Affecting Respiration
Oxygen is the final electron acceptor in the Electron Transport Chain, forming water.
Ref: NCERT Class 11 Biology Chapter 12: Respiration in Plants Respiratory Quotient and Factors Affecting Respiration
When fats are used as respiratory substrates, the RQ is less than 1 due to greater oxygen consumption than CO₂ production.
Ref: NCERT Class 11 Biology Chapter 12: Respiration in Plants Respiratory Quotient and Factors Affecting Respiration
Organic acids can have an RQ greater than 1 because they require less oxygen for oxidation compared to CO₂ released.
Ref: NCERT Class 11 Biology Chapter 12: Respiration in Plants Respiratory Quotient and Factors Affecting Respiration
The Krebs cycle produces NADH and FADH₂, which are used in the Electron Transport Chain for ATP production.
Ref: NCERT Class 11 Biology Chapter 12: Respiration in Plants Respiratory Quotient and Factors Affecting Respiration
Oxygen is consumed during aerobic respiration, while ATP, CO₂, and water are the end products.
Ref: NCERT Class 11 Biology Chapter 12: Respiration in Plants Respiratory Quotient and Factors Affecting Respiration
