What specialized photosynthetic pathway do some desert plants have?

Choose the correct labelling for the given figure.

Why does the rate of photosynthesis decrease at higher temperatures?

The percentage of light energy utilized for photosynthesis by higher plants is

Beyond the saturation point,the rate of photosynthesis begins to decline because of:
$I$. Photo-inhibition
$II$. Photo-oxidation
$III$. Photo-reduction
Select the correct option:

The graph given below shows the effect of potassium cyanide on the rate of photosynthesis of Chlorella at different light intensities. Which one of the following can be deduced from the graph?