The cytoplasm is the site where most cellular activities occur, such as many metabolic pathways, and processes such as cell division.
do you mean cytoplasm? if so then it is found in both animals and plants (it's everything within the cell membrane). For example, the cytosol is the liquid that is in the cytoplasm as well as organelles.
Leaves collect sunlight and convert it into sugar that's used as energy for the plant. That's the simple explanation, I don't remember all the details. Look up the rest on Wikipedia.