One of the main functions of the spines is fairly obvious, which is to protect cacti from predators such as animals and people. What is the purpose of spines on a cactus. Why does a cactus plant have thin spiny leaves. These animals include javelina, pack rats, desert tortoises and even Desert Bighorn sheep.
It thus ensures the survival of the plant long enough to reproduce carry on the survival of its species. In adapting to dry habitats, most species of cacti have modified their leaves into spines otherwise too much water would be lost through the pores. It helps if you think of cactus as a large stem with leaves spines. Why are leaves reduced to spines in a cactus plant. Shelchav Cactus spines are actually modified leaves.