The upcoming discussion will update you about the differences between Photorespiration and Normal Respiration.
Difference # Photorespiration:
1. It occurs only inside photosynthetic cells.
2. Photorespiration takes place only in the presence of light.
3. It is pronounced in C3 plants and negligible in C4 plants.
4. In photorespiration uptake of oxygen and evolution of carbon dioxide are light dependent.
5. Photorespiration increases with the availability of oxygen.
6. It occurs in the chloroplasts and may require the help of peroxisomes and mitochondria.
7. The substrate for photorespiration is RuBP and its breakdown product called glycolate.
8. The substrate is formed at the time of utilization.
9. Toxic H2O2 may be formed during oxidation of the substrate.
10. End products are CO2 and PGA.
11. Both the end products are reutilized in photosynthesis.
12. Photorespiration requires three cell organelieschloroplasts, peroxisomes and mitochondria.
13. It is a wasteful method and does not produce energy.
14. It rises rapidly with the rise in temperature.
15. Photorespiration is not essential.
Difference # Normal Respiration:
1. It is found in all living cells.
2. This type of respiration continues both in dark and light.
3. It is pronounced in all organisms.
4. Exchange of gases is independent of light.
5. It is not influenced by change in oxygen concentration between 10-25%. Beyond it there is a decline in the rate of respiration.
6. It occurs in cytoplasm and mitochondria.
7. The substrate is commonly glucose though other food materials (fat. protein, organic acids) can also be used.
8. The substrate is already present in the cells.
9. Hydrogen peroxide is not produced.
10. End products are CO2 and water.
11. The end products are not recycled in respiration.
12. It requires only mitochondria besides cytoplasm.
13. It produces energy for cellular maintenance, synthesis and work.
14. The rise with temperature is normal as for other biochemical reactions.
15. Normal or dark respiration is essential for survival of organisms.