What purpose do the cactus thorns serve ? 

The spines  help to prevent the cactus from losing water through evaporation. So all in all, spines are adaptations that protect and help cactus hide from animals that may want to eat them. They also provide shade for the plant, which keeps them cooler and limits water loss. Thereby cactus survives in the dessert  areas where there is scanty rainfall.

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