Class 11 Biology Respiration In Plants Aerobic respiration

Aerobic respiration

  • The breakdown of glucose and its successor molecules in the presence of oxygen to release energy is called aerobic respiration.
  • For aerobic respiration, pyruvate is transported from the cytoplasm into the mitochondria.
  • The crucial events in aerobic respiration are:
  • The complete oxidation of pyruvate by the stepwise removal of all the hydrogen atoms, leaving three molecules of CO2.
  • The passing on of the electrons removed as part of the hydrogen atoms to molecular O2 with simultaneous synthesis of ATP.
  • The first process takes place in the matrix of the mitochondria, whereas the second process is located on the inner membrane of the mitochondria.
  • Pyruvate undergoes oxidative decarboxylation by a complex set of reactions catalysed by pyruvic dehydrogenase with the participation of several coenzymes, including NAD+ and Coenzyme A.
  • Two molecules of NADH are produced from the metabolism of two molecules of pyruvic acid.
  • The acetyl CoA then enters a cyclic pathway, tricarboxylic acid cycle, more commonly called as Krebs’ cycle after the discovery of the scientist Hans Krebs.


Fig. Aerobic respiration

Share these Notes with your friends  

< Prev Next >

You can check our 5-step learning process