Difference between oxidative phosphorylation and Photophosphorylation:


 

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Respiration is a complex process, which includes :

 1. Absorption of O2. 2. Conversion of carbohydrate (complex) to CO2 and H2O and simpler substances (i.e. oxidation of food). 3. Release of energy -a part of which is utilized in various vital processes and the rest may be lost in the form of heat. 4. Formation of intermediate products playing different roles in metabolism. 5. Liberation of CO2 and H2O 6. Loss in weight in plants as a result of oxidation. Therefore, respiration is a reverse process of photosynthesis.
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Types of Respiration

 On the basis of the availability of O2, respiration has been divided into two categories. a. Aerobic respiration It is of common occurrence found in all plants and takes place in the presence of O2 and the stored food (respiratory substrate) gets completely oxidized into CO2 and water as,                                      C6 H12O6 + 6O2 → 6CO2 + 6H2O + 686 K.Cal. b. Anaerobic respiration It takes place in the absence of O2 or when O2 conc. is less than 1%. The stored food is completely oxidized and instead of CO2 and water, certain other compounds are also formed. This is of rare occurrence but common among micro-organisms like yeasts and can be represented by,                                        C6H12O6 + → 2C2H5OH + 2CO2 + 56 KCal.
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