Correct Option: D

The photosynthetic efficiency is the fraction of light energy converted into chemical energy during photosynthesis in plants and algae. Approximately two thirds of the net global photosynthetic productivity worldwide is of terrestrial green plant origin. The remainder is produced mainly by phytoplankton (microalgae) in the oceans. Approximately 114 kilocalories of free energy are stored in plant biomass for every mole of CO₂ fixed during photosynthesis.