question_answer

Blackman demonstrated that increasing illumination increased the photosynthetic rate upto a point when\[C{{O}_{2}}\]becomes limiting. If light was not limiting, temperature becomes limiting. Emerson found that maximum\[C {{O} _ {2}}\] fixation could be achieved with brief flashes of light. Mark the correct statement in the following [CPMT 1988, 89]

A) Only one factor can be limited in photosynthesis

B) Photosynthesis consists of a light and dark reaction

C) The trapping of light by chloroplast is temperature dependent

D) The trapping of light by chloroplast can occur only if\[C {{O} _ {2}}\] is present