Q. Inhibition of photosynthesis in the presence of O2 in C3 plants is called ____:
Answer: Warburg effect
Notes: An increase in the oxygen concentration in many plants results in a decrease in the rate of photosynthesis. This phenomenon of the inhibition of photosynthesis by O2 was first discovered by a German biochemist Warburg in 1920 in Chorella (a green alga) and is called Warburg effect. O2 causes greatest inhibition of photosynthesis when CO2 levels are low and light levels are saturating. This effect is known to occur in C3 plants (Soybean) and C4 plants (Sorghum, Maize, Sugarcane), etc.