The biochemical phase of photosynthesis was first discovered by .........

'Photosynthesis is the conversion of light energy within a plant' was first stated by

Select the correct option regarding the experiments on photosynthesis.

The experimental material that has largely been responsible for making rapid advances in research on photosynthesis is

Variegated leaves of a plant were supplied with radioactive carbon dioxide $(^{14}CO_2)$ during an experiment. Leaf $X$ was kept in the dark and leaf $Y$ was kept in the light. At the end of the experiment,the radioactivity in the leaves was measured and found to be as shown in the diagram. What is the most likely explanation for the level of radioactivity found in the yellow zone of leaf $Y$?

Through the use of oxygen $-18$ (heavy oxygen),scientists have found that the oxygen released during photosynthesis comes from molecules of