Chapter 10: Photosynthesis Concept 10.4 (195 ? 197) is not required knowledge for the AP? exam and is omitted. Overview: The Process That Feeds the Biosphere photosynthesis is the process that converts solar energy into chemical energy plants and other autotrophs are the producers of the biosphere photosynthesis occurs in plants, algae, certain other protists and some prokaryotes heterotrophs obtain their organic material from other organisms?consumers Concept 10.1: Photosynthesis converts light energy to the chemical energy of food Chloroplasts: The Sites of Photosynthesis in Plants the leaves of plants are the major sites of photosynthesis the color of the leaf is from chlorophyll, a pigment within the chloroplasts