The amount of energy produced by sun in a fraction of a second is more than what can be produced by burning all Earth's natural reserves of oil, coal, wood and natural gas
source : nuclear fusion in Sun
Clorophyll for producing oxygen in leaf is exactly same in structure as hemoglobin of our body that absorbs oxygen
the only difference is of Mangnese in former and iron in latter
Source : Photosynthesis
Glucose is cellulose reversed one is edible other is not
Source chemistry of wood