Photophosphorylation was first demonstrated by ......... .

In bacterial photosynthesis,the hydrogen donor is:

Evaluate the following statements regarding $T$. $W$. Engelmann's experiment:
$1.$ $T$. $W$. Engelmann stated that chlorophyll present in algae absorbs light of green and orange colors,splits water molecules by photolysis,and releases $O_2$.
$2.$ Aerobic bacteria accumulate near the algae to utilize the released $O_2$.

Who discovered that light is essential for releasing oxygen in plants?

Which scientist conducted the experiment shown below?

Which isotope is used to study photosynthesis?