The detectable end product of photosynthesis is

Which of the following categories of photosynthetic plants has the lowest transpiration ratio $(TR)$?

The importance of photosynthesis is due to

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 $686 \ kcal$?

Select the correct option:
$(1)$ Maize / Sunflower is a $C_4$ plant.
$(2)$ Rubisco / Oxygenase is the most abundant enzyme in the world.

$CO_2$ is constantly released in respiration,yet its level remains fairly uniform because: