This happens when a detection is accomplished through heuristics. There is no such thing as a heuristic virus. As a technical concept, everything in malware detection is done via heuristics.
Photosynthesis is the process in which plants (also autotrphoic protists and some bacteria) use light energy, from the Sun, to make sugars and organic food molecules from CO2 and water (H2O). This process is essential for the formation of not only energy, but also for the formation of glucose for purposes of structure.
Quick Answer. During photosynthesis, plants take in carbon dioxide and water, disassemble the molecules and convert them into sugar and oxygen. The water molecules are split into hydrogen and oxygen, and the hydrogen joins carbon dioxide to create sugars. The excess oxygen is released into the atmosphere during the respiration cycle.