How do saguaros survive in the desert?

Answer 1

The saguaros, like all cacti, store water in its body which has a waxy outer skin which prevents the loss of water. The leaves on the saguaros are thin needles which also have a hard outer layer and this creates a barrier against moisture loss. Even though the deserts receive very little rain, the roots of a cactus are very near the ground and soak up any moisture, rain or condensation quickly before it disappears. Since very little water evaporates from each cactus, it can survive with very sparse waterings.