lightenings

well a college of mine mentioned something about seeds not being able to photosynthesize and so require the atp made during respiration. She also mentioned winter months where there is a lack of sunlight which would = less photosynthesis......if anyone can elaborate on this would be appreciated.

I am having problems understanding this subject and i wanted to know why plants need to be able to produce ATP by respiration AS well as by photosynthesis. I know its got something to do with using the co2 produced in light reaction ie photosynthesis to create Atp in dark reactions respiration....... i think. Help!!