Suppose $Euphorbia$ and $Maize$ are grown in a tropical area. Which one of them do you think will be able to survive better under such conditions?

Which of the following is/are the raw material$(s)$ for photosynthesis?
$I$. $H_{2}O$
$II$. $CO_{2}$
$III$. Light
$IV$. Chlorophyll
Choose the correct option.

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:

In which of the following is oxygen $NOT$ produced during photosynthesis?

Approximately $9/10$ $(85-90\%)$ of the total photosynthesis on Earth is carried out by:

Provide the full names for the following abbreviations:
$(1)$ $PGA$
$(2)$ $OAA$