Which group is not alike?

Select the correct option:
$(1)$ Julius von Sachs / $T$. $W$. Engelmann proved with evidence that glucose is produced when plants grow.
$(2)$ In $PS-II$,maximum light absorption occurs at a wavelength of $680 \, nm / 800 \, nm$.

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

In which of the following is light energy stored in the form of chemical energy?

Photosynthesis is a $..............$ process.

Under conditions of constant illumination,the compensation period for a whole aquarium would be of infinite length when: