The energy stored in glucose basically comes from

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.

Choose the correct option:
$(1)$ The first product of the $C_3$ pathway in the Calvin cycle is $PGA / OAA$.
$(2)$ The primary acceptor of $CO_2$ in the $C_4$ pathway is $PEP / OAA$.

Sugars extracted from sugarcane and sugar beet differ in:

$A -$ Calvin cycle starts with the carboxylation of $RuBP$.
$R -$ Photorespiration starts with the oxygenation of $RuBP$.

In plants,the uptake of $CO_2$ and the release of $O_2$ is a process called .........