HI Mate! The right answer is vascular tissue!
As photosynthesis is a process that requires sunlight, the rate of this process will be 0 in a room without any light.
However, even if the dark room has very little light, it may still not be enough for photosynthesis to occur. This process requires certain levels of sunlight.
Its E= it can be damage to the ozone layer. Hope this helped you out ;)
Nuclear reactors use hydrogen and they are an up and coming energy source.
There are also hydrogen fuel cells.