How do cacti photosynthesize? - Quora
What part of the cactus photosynthesizes? - Stack …
So, cacti don’t have leaves, right? Well, kind of, but those spiky bits are technically modified leaves. That is why they are, in botanical lingo, spines. . At some point early in the evolution of cacti their leaves evolved to be smaller and smaller and eventually into hardened points that did not photosynthesize. Cacti also evolved green stems which took over the photosynthetic tasks.
photosynthesis for cactus? | Yahoo Answers
Like other succulent plants, most cacti employ a special mechanism called "crassulacean acid metabolism" (CAM) as part of photosynthesis. Transpiration, during which carbon dioxide enters the plant and water escapes, does not take place during the day at the same time as photosynthesis, but instead occurs at night. The plant stores the carbon dioxide it takes in as malic acid, retaining it until daylight returns, and only then using it in photosynthesis. Because transpiration takes place during the cooler, more humid night hours, water loss is significantly reduced.