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The Krebs cycle of aerobic respiration occurs in which part of the cell?
AChloroplast
BCytoplasm
CInner mitochondrial membrane
DMitochondrial matrix
Answer & Solution
Correct answer: D. Mitochondrial matrix
1. After glycolysis, two pyruvic acid molecules enter the mitochondria.
2. The Krebs cycle oxidises pyruvic acid into carbon dioxide and water.
3. This cycle takes place in the mitochondrial matrix.
4. So the mitochondrial matrix is the correct site.
5. Option C inner mitochondrial membrane hosts the electron transport chain, the trap.
6. Option B cytoplasm is where glycolysis occurs, so it is wrong.
7. Option A chloroplast is a plant photosynthesis organelle, not for Krebs cycle.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 12 Plant Anatomy and Plant Physiology "Krebs Cycle", p.190_
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