Botany - Photosynthesis in Higher Plants Question with Solution | TestHub

Oxygen accumulation causes substantial inhibition of photosynthesis. Both oxygen evolution and ${\mathrm{CO}}_2$ assimilation were reduced in the presence of atmospheric oxygen. Oxygen causes a direct and indeed competitive inhibition of Ribulose diphosphate carboxylase. As a result glycolate synthesis is enhanced and leads to begin photorespiration. Carbon dioxide being one of the raw materials for photosynthesis, its concentration affects the rate of photosynthesis markedly. Because of its very low concentration in atmosphere $(0.03$ per cent only) it acts as a limiting factor in natural photosynthesis.