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

Separate the processes of light reaction and dark reaction from the following:
$I-$ Fixation of $CO_2$
$II-$ Absorption of light
$III-$ Release of $O_2$
$IV-$ Utilization of $ATP$ and $NADPH_2$
$V-$ Synthesis of $ATP$ and $NADPH_2$
$VI-$ Synthesis of glucose
Identify the correct sequence for light reaction and dark reaction respectively.

Who proposed the theory of photosynthesis in guard cells?

Read the following and choose the option containing the correct pair:
$I.$ $DCMU$: Herbicide,Inhibitor of non-cyclic electron transport
$II.$ $PMA$: Fungicide,Reduces transpiration
$III.$ Colchicine: Alkaloid,Causes male sterility
$IV.$ Soilrite: Sodium alginate,Encapsulation of somatic embryos

Select the correct option:
$(1)$ Maize / Sunflower is a $C_4$ plant.
$(2)$ Rubisco / Oxygenase is the most abundant enzyme in the world.

Plants are known as purifiers of air due to the process of: