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Cellular Respiration

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Estimated time: 5 minutes
  • Definition: Aerobic Respiration
  • Definition: Anaerobic Respiration
  • Key Points: Cellular Respiration
CBSE: Class 10

Definition: Aerobic Respiration

The breakdown of glucose in the presence of oxygen to produce carbon dioxide, water, and energy is called aerobic respiration.

CBSE: Class 10

Definition: Anaerobic Respiration

The breakdown of glucose in the absence of oxygen to produce alcohol or lactic acid and a small amount of energy is called anaerobic respiration.

CBSE: Class 10
Maharashtra State Board: Class 12

Key Points: Cellular Respiration

  • Cellular respiration is the process where food (glucose) is oxidised inside the cell to release energy, stored as ATP via phosphorylation.
  • Oxidation: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + 686 Kcal | Phosphorylation: ADP + iP + 7.3 Kcal → ATP
  • First step occurs in cytoplasm — glucose breaks down into pyruvate (3-carbon molecule), releasing some energy.
  • Without O₂ (Anaerobic) — Pyruvate → Ethanol + CO₂ (yeast) or Lactic acid (muscles). Less energy released.
  • With O₂ (Aerobic) — Pyruvate breaks down in mitochondria into CO₂ + H₂O, releasing a large amount of energy as ATP.

Shaalaa.com | Respiration in Plants part 10 (Krebs cycle: Step 1 to 5)

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Respiration in Plants part 10 (Krebs cycle: Step 1 to 5) [00:10:36]
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