The concentration of $CO_{2}$ in the atmosphere is between

When $NaHCO_3$ is added in small quantity in an experiment showing photosynthesis,what will be the effect on it?

What is the common value of $PQ$ (photosynthetic quotient) of a leaf?

$A-$ The $C_3$ and $C_4$ plants respond differently to $CO_2$ concentrations.
$R -$ The concentration of $CO_2$ in the atmosphere is between $0.03$ and $0.04$ percent. An increase in concentration up to $0.05$ percent can cause an increase in $CO_2$ fixation rates.

What is the compensation point?

Photosynthetic yield is maximum at the