- Cactus
Cacti depend on chlorophyll in the outer tissue of their skin and stems to conduct photosynthesis for the making of food. Spines protect the plant from animals, shade it from the sun and also collect moisture. Extensive shallow root systems are usually radial, allowing for the quick storage of large quantities of water when it rains. Because they store water in the core of both stems and roots, cacti are well-suited to dry climates and can survive years of drought on the water collected from a single rainfall.
Taken from: http://www.cartage.org.lb/en/themes/sciences/botanicalsciences/PlantsAdaptability/DesertPlant/DesertPlant.htm
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