Can you design an experiment to demonstrate that sunlight is essential for photosynthesis?

Experiment to prove that sunlight is essential for photosynthesis
(i) A potted plant is taken and kept in dark for about 36 hours to destarch the leaves. Some portion of the leaf is covered with black strips on both the surfaces
(ii) The plant is then placed in sunlight for 6 hours.
(iii)The leaf is plucked, strips are removed and leaf is tested for starch by boiling it in water and alcohol for decolourizing it. The decolourized leaf is treated with iodine.
(iv) The part which was covered by black strips became yellow while the exposed part becames blue.
This shows that only lighted part synthesised food (starch). Hence we can conclude that light is necessary for photosynthesis.


 To show that light is necessary for photosynthesis. (A) destarched leaf covered with light screen. (B) covered portion does not turn blue black while tested with iodine.