How do plants obtain their nutrition?

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:

During daylight hours,the rate of photosynthesis is higher than that of respiration,and the ratio of oxygen produced to that of consumed is (in $:1$)

Match the following columns:

Column-$I$	Column-$II$
$A$. Light reaction	$1$. Membranous system
$B$. Dark reaction	$2$. $NADPH$ and $ATP$ product
	$3$. Starch

Select the correct matching:

Give scientific reasons:
$(1)$ The productivity of $C_4$ plants is more than $C_3$ plants.
$(2)$ It is necessary that the Calvin cycle runs for six times.

Select the incorrect statement $:$