Answer: natural selection
In photosynthesis experiment, the effect of the light will be observe during the starch production- thus you need to have a plant without a starch to observe if the starch is produced during photosynthesis. Letting the leaves of the plant deprived from light for 48 hours will be forced to use its reserved starch making the storage of the starch decrease.
Om said that he had a lot more than a little more money than his wife and I was in the middle of a meeting with the guy that was going through the house and I had to go back and forth with him