What percentage of usable radiant energy entering a reaction site of photosynthesis is converted to potential energy (in $\%$)?

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

Which of the following statements is/are not true?
$I.$ In $CAM$ plants,stomata open during dark and remain closed during the day.
$II.$ Role of $Na^+$ in stomatal opening is now universally accepted.
$III.$ The water potential of root cells is higher than the water potential of soil.
$IV.$ Capillarity theory is the most accepted theory of water movement through plants.
$V.$ The walls of xylem vessels made up of ligno-cellulose have strong affinity for water molecules.

Which of the following methods is responsible for $ATP$ production by green plant cells in the presence of sunlight?

Find out the correct match from the following table $:-$

Column-$I$	Column-$II$	Column-$III$
$i$. Calvin cycle	Algae	$^{14}CO_2$
$ii$. Hatch and Slack pathway	Sorghum	Kranz anatomy
$iii$. Photorespiration	$C_3$ plant	$OAA$
$iv$. $CO_2$ fertilization	$Cu$	$CO_2$

Photosynthesis is a