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(1) At high light intensities, both C and C-plants show, increase in the rates of photosynthesis. Hence, C4-plants, show saturation at about 36OulL-,, while C, responds tolEm, increased CO, concentration acting as a limiting factbr.AZA, (µi) This is the reason C plants like tomatoes and bell pepper, are allowed to grow in CO, enriched atmosphere that leads, to high yield., and saturation is.sien gnly-1, beyo nd 4JDILL, 450'18/2, 63. Temperature as a limiting factor:, (1) The C4-plants respond to higher temperatures and show, higher rate of photosynthesis, while C2-plants have a much, lower optimum temperature., ल तनव, 64. Water stress causes stomata to closę hence, reducing the CO2, availability,, water Stre8 makes, Beside , leares, iit, Thus, neducing the burface, anea f the Ieafes 'and Their, metabolic, activity, Exercises, :as uell.