The Krebs cycle of aerobic respiration is carried out within which of the following cell organelles?
Show answer & explanation
Correct answer: A
Explanation
The Correct Answer is option 1 i.e. Mitochondria.
The Krebs cycle, also known as the Citric Acid Cycle or TCA (Tricarboxylic Acid) Cycle, is a crucial part of aerobic respiration and takes place in the mitochondria of eukaryotic cells. It occurs specifically in the mitochondrial matrix, where enzymes catalyze the step-by-step oxidation of acetyl-CoA to produce energy-rich molecules like NADH, FADH₂, and ATP. These products are then used in the electron transport chain to generate more ATP. Mitochondria are often called the 'powerhouse of the cell' because they produce most of the cell’s energy through this process.
Other options :
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Spirogyra: A filamentous green alga, not a cell organelle.
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Lysosome: Involved in digestion, not energy production.
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Nucleus: Controls cellular functions but not where the Krebs cycle occurs.