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Warbung effect refers toA. decreased photosynthetic rate at very high `O_(2)` concentrationB. increased photosynthetic rate at very high `O_(2)` concentrationC. decreased photosynthetic rate at very low `O_(2)` concentrationD. increased photosynthetic rate at very low `O_(2)` concentration |
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Answer» Correct Answer - A Oxygen is a product of photosynthesis. A small quantity of `O_(2)` is essential for photosynthesis to take place. But as `O_(2)` concentration rises, rate of photosynthesis decreases, which may be because (i) oxygen takes takes part in oxidation of photosynthetic pigments, intermediates and enzymes in the presence of strong light (photo-oxidation), (ii) oxygen is a storng quencher of excited state of chlorophyll. Oxygen competes with `CO_(2)` for reducing power. It converts RuBP-carboxylase to RuBP-oxygenase. At very high oxygen concentration, the rate of photsynthesis begins to decline in all plants. This pehnomenon is referred tp as Warnirg effect/ |
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