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