Question

At what concentration do C4 plants show saturation?

(a) 430 μlL^-1

(b) 450 μlL^-1

(c) 340 μlL^-1

(d) 360 μlL^-1

This question was addressed to me in a national level competition.

My question is from Factors Affecting Photosynthesis in portion Photosynthesis in Higher Plants of Biology – Class 11

Answer 1

Right option is (d) 360 μlL^-1

Easiest explanation: C3 plants and C4 plants show different carbon dioxide concentration saturations. At high intensities of light, C4 plants show carbon dioxide saturation at 360 μlL^-1 while C3 plants show saturation at 450 μlL^-1.