Which of the following is not required in the synthesis of carbohydrates?

Select the incorrect statement.

Match the organic compounds listed under Column-$I$ with the explanation given under Column-$II$. Choose the appropriate option from the given choices.

Column-$I$	Column-$II$
$A$. Phosphoenol pyruvate $(PEP)$	$p$. $6$-carbon compound
$B$. Ribulose biphosphate $(RuBP)$	$q$. $2$-carbon compound
$C$. Oxaloacetic acid $(OAA)$	$r$. $4$-carbon compound
$D$. Acetyl coenzyme $A$	$s$. $5$-carbon compound
-	$t$. $3$-carbon compound

Assertion : Photosynthesis is important due to two reasons.
Reason : Photosynthesis is the primary source of food on earth and responsible for the release of oxygen from green plants.

How many molecules of water are needed by a green plant to produce one molecule of hexose or to reduce $6$ molecules of $CO_2$?

For photosynthesis (i.e. for the synthesis of organic matter),the green plants need only