Photo-oxidation of chlorophyll is called .........

Match the following columns:

Column-$I$	Column-$II$
$A$. $PGA$	$P$. Act as oxygenase enzyme
$B$. $OAA$	$Q$. Primary acceptor of $CO_2$
$C$. RuBisCO	$R$. First product of $C_4$ pathway
$D$. RuBP	$S$. First product of $C_3$ pathway

$A$: For every $CO_2$ molecule entering the $C_3$ cycle,three molecules of $ATP$ and two molecules of $NADPH$ are required.
$R$: Cyclic photophosphorylation takes place to meet the difference in the number of $ATP$ molecules.

Which of the following statements is incorrect?

The most vital process for the existence of life on earth is

According to an estimate,how much carbon is fixed annually in the biosphere through photosynthesis?