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This article is about the C4 type of photosynthesis. C-4 is also a type of explosive.

One of the primary biosynthetic processes involved in photosynthesis is the Calvin cycle, which can take one of 3 forms in most plants. The C3, C4 and CAM variations operate in a manner to maximize the plants' energy production. Some plants can employ more than one form of the Calvin cycle, but most use only one type. In C3 and C4 plants, carbon dioxide is taken up during the daylight hours; in CAM plants carbon dioxide is taken up only at night. Most cacti are CAM plants, respiring only at night during lower temperatures.

C4 photosynthesis is generally found in plants that come from high light regions. The C4 process allows a plant to compensate for high light levels by taking up more carbon dioxide. CO2 that is used in this way is unavailable for photosynthesis, but is incorporated into the plant tissues and eventually reenters the photosynthesis chain.

C4 - explosive

Named after what it is, a composite explosive. Several versions exists, for example C3 and C4.