The energy stored in glucose basically comes from

Select the correct option regarding photosynthesis.

Analogy type questions:
$(1)$ $C_4$ plants : Show $CO_2$ saturation at $360 \,\mu l L^{-1}$ :: $C_3$ plants : Show $CO_2$ saturation at concentrations above ............
$(2)$ Green plants : $H_2O$ as hydrogen donor :: Green sulfur bacteria : ............

Assertion: Six molecules of $CO_2$ and twelve molecules of $NADPH + H^+$ and $18\, ATP$ are used to form one hexose molecule.
Reason: Light reaction results in the formation of $ATP$ and $NADPH_2$.

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

Diffusion, a process that occurs along the concentration gradient, is actively involved in: