Light was long considered to be a wave, exhibiting the phenomenon of interference in which ripples like those in water waves ...

The leaf is spread out in a Petri dish and covered with iodine solution. The areas that were exposed to the light stain blue-black. The areas that were covered by the silver foil remain pale.

1: temperature: to control temperature, use LED light bulbs which don't get hot. Change of temperature can affect the rate of photosynthesis. 2: carbon dioxide concentration: add sodium hydrogen ...