Provide the full names for the following abbreviations:
$(1)$ $PGA$
$(2)$ $OAA$

Select the correct statement.

During daylight hours,the rate of photosynthesis is higher than the rate of respiration,and the ratio of oxygen produced to oxygen consumed is ......... . (in $:1$)

$I.$ Photosystem-$I$ is a photosynthetic pigment system located on the appressed part of grana and thylakoids.
$II.$ Photosystem-$II$ is a photosynthetic pigment system located on the non-appressed part of stroma only.
Identify whether the given statements are correct or incorrect and choose the correct option accordingly.

By which process is $CO_2$ not added into the atmosphere?

Read the following four statements ($a, b, c,$ and $d$) carefully and select the option that includes both correct statements.
$(A)$ The $Z$-scheme of light reaction occurs only in the presence of $PSI$.
$(B)$ Only $PSI$ is functional in cyclic photophosphorylation.
$(C)$ Cyclic photophosphorylation results in the synthesis of $ATP$ and $NADPH_2$.
$(D)$ Stroma lamellae lack both $PS-II$ and $NADP$ reductase $(FNR)$.