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

Plants in which the first product of $CO_{2}$ fixation is $C_{3}$ acid,i.e.,the ...$A$... pathway,and those in which the first product was $C_{4}$ acid $(OAA)$,i.e.,the ...$B$... pathway. Complete the given statement by filling appropriate options in the given blanks.

When green algae are illuminated,motile aerobic bacteria usually accumulate near them. This is because,bacteria

The plant $Cuscuta$ shows maximum photosynthesis in

Out of the two statements given here $:-$
$(A) \ C_4$ plants are more effective in productivity as compared to $C_3$ plants.
$(B) \ C_3$ plants show photorespiration at high $CO_2$ concentration.

Match the sites in column $I$ with the processes in column $II$ and choose the correct combination from the options:

Column $I$	Column $II$
$A$. Grana of chloroplast	$1$. Kreb's cycle
$B$. Stroma of chloroplast	$2$. Light reaction
$C$. Cytoplasm	$3$. Dark reaction
$D$. Mitochondrial matrix	$4$. Glycolysis