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Q1(b):
Differentiate between (b) Glycolysis and Krebs’ cycle
Solution :
Definition and Theoretical Basis
Glycolysis (the Embden-Meyerhof-Parnas pathway) is the universal initial phase of cellular respiration occurring in the cytosol, wherein glucose is partially oxidized to pyruvate. The Krebs’ cycle (Citric Acid Cycle) is the secondary aerobic phase occurring within the mitochondrial matrix, involving the complete oxidation of acetyl-CoA derivatives to $CO_2$ and high-energy electron carriers.
Comparative Analytical Table
| Feature | Glycolysis | Krebs’ Cycle |
|---|---|---|
| Site of Occurrence | Cytosol [Cytoplasmic compartment] | Mitochondrial Matrix [Inner mitochondrial compartment] |
| Requirement of $O_2$ | Anaerobic (Does not require oxygen) | Aerobic (Requires $O_2$ indirectly via ETS) |
| Substrate | Glucose ($C_6H_{12}O_6$) | Acetyl-CoA ($C_2$ unit) |
| Net Energy Yield | $2$ $ATP$ and $2$ $NADH$ per glucose | $2$ $GTP$ ($ATP$), $6$ $NADH$, $2$ $FADH_2$ per glucose |
| Decarboxylation | Absent | Present (Release of $2$ $CO_2$ per acetyl-CoA) |
Sequential Metabolic Logic
1. Glycolysis Dynamics: The process involves a $10$-step enzymatic conversion of one molecule of $6$-carbon glucose into two molecules of $3$-carbon pyruvate. [By the Phosphofructokinase rate-limiting step]. Energy is harvested via substrate-level phosphorylation.
2. Krebs’ Cycle Dynamics: The cycle commences with the condensation of a $2$-carbon acetyl group with $4$-carbon oxaloacetic acid to form a $6$-carbon citrate. [Per the Citrate Synthase catalysis]. It undergoes a series of redox reactions, releasing carbon as $CO_2$, and transferring electrons to $NAD^+$ and $FAD$.
Visual Representation of Pathways
Final Solution: Glycolysis is the anaerobic breakdown of glucose in the cytosol resulting in pyruvate and minimal ATP, whereas the Krebs’ cycle is the aerobic completion of glucose oxidation within the mitochondria, yielding primary electron carriers ($NADH, FADH_2$) for oxidative phosphorylation.
More Questions from Class 11 Biology Respiration in Plants EXERCISES
- Q1(a): Differentiate between (a) Respiration and Combustion
- Q1(c): Differentiate between (c) Aerobic respiration and Fermentation
- Q2: What are respiratory substrates? Name the most common respiratory substrate.
- Q3: Give the schematic representation of glycolysis?
- Q4: What are the main steps in aerobic respiration? Where does it take place?
- Q5: Give the schematic representation of an overall view of Krebs’ cycle.
- Q6: Explain ETS.
- Q7(a): Distinguish between the following: (a) Aerobic respiration and Anaerobic respiration
- Q7(b): Distinguish between the following: (b) Glycolysis and Fermentation
- Q7(c): Distinguish between the following: (c) Glycolysis and Citric acid Cycle
- Q8: What are the assumptions made during the calculation of net gain of ATP?
- Q9: Discuss “The respiratory pathway is an amphibolic pathway.”
- Q10: Define RQ. What is its value for fats?
- Q11: What is oxidative phosphorylation?
- Q12: What is the significance of step-wise release of energy in respiration?
CBSE Solutions for Class 11 Biology Respiration in Plants
Chapters in CBSE - Class 11 Biology
- The Living World
- Biological Classification
- Plant Kingdom
- Animal Kingdom
- Morphology of Flowering Plants
- Anatomy of Flowering Plants
- Structural Organisation in Animals
- Cell – The Unit of Life
- Biomolecules
- Cell Cycle and Division
- Transport in Plants
- Mineral Nutrition
- Photosynthesis
- Plant Growth and Development
- Digestion and Absorption
- Breathing and Exchange of Gases
- Body Fluids and Circulation
- Excretory Products and Elimination
- Locomotion and Movement
- Neural Control and Coordination
- Chemical Coordination and Integration
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