Which branch of Botany is concerned with the study of photosynthesis?

Photosynthesis is:
$I.$ Endergonic process
$II.$ Exergonic process
$III.$ Chemical process
$IV.$ Physical process
Select the correct option.

Match the following columns:

Column-$I$	Column-$II$
$(A)$ $P_{680}$	$(I)$ Reaction centre of $PS-I$
$(B)$ $P_{700}$	$(II)$ Reaction centre of $PS-II$
$(C)$ $\text{LHC}$	$(III)$ Antennae
$(D)$ Plastoquinone	$(IV)$ Mobile carrier

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 $PEP / OAA$.

Match the organic compounds listed under Column-$I$ with the explanation given under Column-$II$. Choose the appropriate option from the given choices.

Column-$I$	Column-$II$
$A$. Phosphoenol pyruvate $(PEP)$	$p$. $6$-carbon compound
$B$. Ribulose biphosphate $(RuBP)$	$q$. $2$-carbon compound
$C$. Oxaloacetic acid $(OAA)$	$r$. $4$-carbon compound
$D$. Acetyl coenzyme $A$	$s$. $5$-carbon compound
-	$t$. $3$-carbon compound

Which of the following has been used in photosynthetic researches?