Chloroplast fixes:

Which of the following proteins is the most abundant on Earth?

For the process of photosynthesis,all except one of the following items are essential. Point out the exception.

Assertion: Photosynthetically,$C_4$ plants are less efficient than $C_3$ plants.
Reason: The operation of the $C_4$ pathway requires the involvement of only bundle-sheath cells.

$A-$ In chloroplast,the membrane system is responsible for trapping the light energy and also for the synthesis of $ATP$ and $NADPH$. This is called the light reaction.
$R-$ In the stroma,enzymatic reactions incorporate $CO_2$ into the plant,leading to the synthesis of sugar.

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