Aerobic atmosphere is maintained by

Oxygenic photosynthesis occurs in

In plants,food is stored as ........ .

The energy of a mole of light quanta is $72 \ kcal$ in the blue region at $400 \ nm$ and $41 \ kcal$ in the red region at $700 \ nm$. How much light energy would be required under standard conditions to make $1 \ mole$ of glucose costing $686 \ kcal$?

$A -$ Productivity of $C_3$ plants is higher than $C_4$ plants.
$R -$ Photorespiration occurs in $C_3$ plants.

Which of the following groups of organisms does not produce $O_2$ during photosynthesis?