For photosynthesis (i.e. for the synthesis of organic matter),the green plants need only

In which of the following is oxygen $NOT$ produced during photosynthesis?

Select the correct statement.

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 $686 \ kcal$?

$A$ : 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.