What are the requirements for photosynthesis to occur, and what is the role of atp in this reaction? a) water, oxygen, and chemical energy are required, and atp is changed to adp. b) water, carbon dioxide, and electrical energy are required, and atp is produced. c) water, phosphate group, and thermal energy are required, and atp is lost. d) water, carbon dioxide, and sunlight are required, and atp is produced.