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

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(N/A) $(1)$ $PGA$ stands for Phosphoglyceric acid, which is the first stable product of the $C_3$ cycle (Calvin cycle) in photosynthesis.
$(2)$ $OAA$ stands for Oxaloacetic acid, which is the first stable product of the $C_4$ cycle (Hatch-Slack pathway) in photosynthesis.

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Analogy type question:
$(1)$ Biosynthetic phase : Based on $CO_2$ and $H_2O$ :: Phosphorylation : ......
$(2)$ First product of $C_3$ cycle : $PGA$ :: First product of $C_4$ cycle : ......

Which of the following does not evolve oxygen during photosynthesis?

$A$ : Most of the photosynthesis takes place in the blue and red regions of the spectrum.
$R$ : Action spectrum shows the amount of energy of different wavelengths of light absorbed by pigments.

In which of the following aspects do photosynthetic bacteria differ from green plants?

$A$ small mesophytic twig with green leaves is dipped into water in a big beaker under sunlight. It demonstrates

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