are cactus c3 or c4 plants?
An example of C3 are Sunflower, Spinach, Beans, Rice, Cotton, while the example of C4 plants is Sugarcane, Sorghum, and Maize, and Cacti, orchids are the example of CAM plants. C3 can be seen in all photosynthetic plants, while C4 is followed by tropical plants and CAM by Semi-arid condition plants.