With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

• A

  $\mathrm{Increasing} \mathrm{atmospheric} {\mathrm{CO}}_2 \mathrm{concentration} \mathrm{up} \mathrm{to} 0.05\% \mathrm{can} \mathrm{enhance} {\mathrm{CO}}_2 \mathrm{fixation} \mathrm{rate}$.

• B

  ${\mathrm{C}}_3 \mathrm{plants} \mathrm{respond} \mathrm{to} \mathrm{higher} \mathrm{temperatures} \mathrm{with} \mathrm{enhanced} \mathrm{photosynthesis} \mathrm{while} {\mathrm{C}}_4 \mathrm{plants} \mathrm{have} \mathrm{much} \mathrm{lower} \mathrm{temperature} \mathrm{optimum}.$

• C

  $\mathrm{Tomato} \mathrm{is} \mathrm{a} \mathrm{greenhouse} \mathrm{crop} \mathrm{which} \mathrm{can} \mathrm{be} \mathrm{grown} \mathrm{in} {\mathrm{CO}}_2-\mathrm{enriched} \mathrm{atmosphere} \mathrm{for} \mathrm{higher} \mathrm{yield}.$

• D

  $\mathrm{Light} \mathrm{saturation} \mathrm{for} {\mathrm{CO}}_2 \mathrm{fixation} \mathrm{occurs} \mathrm{at} 10\% \mathrm{of} \mathrm{full} \mathrm{sunlight}.$