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.
Oxygen is then excreted from the plant.The second stage of photosynthesis is the production of food, or glucose, a type of sugar made from hydrogen, carbon and oxygen. The hydrogen atoms come from water, while the carbon and oxygen come from carbon dioxide, which is absorbed through the pores on the plant's leaves. The water and carbon dioxide combine in a chemical reaction, resulting in sugar and oxygen.