Which part of a leaf containst the most chlorophyll and why?
Yes, for most plants the upper surface facing the sun has more chlorophyll. This is because light is necessary for chloroplast development (and more light–> better photosynthesis) However, some plants’ leaves grow vertically and they have identical chlorophyll content on both sides! One example is Acacia: http://www.botgard.ucla.edu/html/botanyt… the other one is Persoonia: http://www.botgard.ucla.