The primary ${\mathrm{CO}}_2$ acceptor in ${\mathrm{C}}_4$ plants is:

In ${\mathrm{C}}_4$ pathway, the 4-carbon compound transported to bundle sheath cells most commonly is:

Identify the incorrectly matched pair:

The ${\mathrm{C}}_3$ and ${\mathrm{C}}_4$ photosynthesis pathways are so called because the initial carbon fixation product in them are respectively:

A ${\mathrm{C}}_3$ and a ${\mathrm{C}}_4$ plant were fed with carbon dioxide radioactively labeled with an isotope of carbon. In which of the following molecules, respectively in ${\mathrm{C}}_3$ and ${\mathrm{C}}_4$ plants, would radioactivity first appear as photosynthesis progresses?

The following diagram shows the ${\mathrm{C}}_4$ photosynthetic carbon cycle. A and B can respectively be:
   

Identify the incorrect statement regarding the comparison of ${\mathrm{C}}_4$ plants to the ${\mathrm{C}}_3$ plants:

The pathway shown in the figure will be seen in:

1. ${\mathrm{C}}_4$ plants
2. CAM plants
3. ${\mathrm{C}}_3$ plants
4. All photosynthetic plants