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By Gk Scientist Dec 10, 2020
Difference Between Respiration and Photorespiration
Difference Between Respiration and Photorespiration:
Following are the points of difference between Respiration and Photorespiration.
Dark (Normal) Respiration | Photorespiration |
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It takes place almost in all the cells of the plant. | It occurs in the green photosynthesizing cells. |
It occurs both in light and dark. | It takes place only in the presence of light. |
It is a breakdown of the respiratory substrate with oxygen as the terminal oxidant. | It is direct oxidation of photosynthetic intermediates. |
It is found in all types of plants, animals and other organisms. | It is restricted to C3 plants. |
There is a generation of usable energy in the form of ATP both through substrate phosphorylation as well as oxidative phosphorylation. | It does not produce ATP. Rather, it consumes the same. |
It liberates energy. | It consumes energy. |
Steps of respiration occur in cytoplasm and mitochondria. | It occurs in the chloroplast and may require the help of peroxisome and mitochondrion. |
A substrate is commonly glucose, though other food materials (fats, proteins, organic acids) can also be used. | A substrate for photorespiration is RuBP and its breakdown product is glycolate. |
End products are CO2 and water | End products are CO2 and PGA. |
The end products are not recycled. | The end products are recycled in the cells producing them. |
It involves glycolysis, Kreb’s Cycle and ETS. | It does not involve Glycolysis, Kreb’s Cycle, and ETS. |
It increases the net productivity of green plants. | It decreases the net productivity of green plants. |
H2O2 is not formed. | It produces H2O2. |
Essential for the survival of organisms. | It is not essential for survival. |
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