What is the effect of high $CO_{2}$ concentration and higher values of $ATP/ADP$ ratio?

The detectable end product of photosynthesis is

Which of the following photosynthetic bacteria possess both $PS-I$ and $PS-II$?

Blackman demonstrated that increasing illumination increased the photosynthetic rate up to a point when $CO_2$ becomes limiting. If light was not limiting,temperature becomes limiting. Emerson found that maximum $CO_2$ fixation could be achieved with brief flashes of light. Mark the correct statement in the following:

The energy stored in glucose basically comes from

By which process is $CO_2$ not added into the atmosphere?