Why don't cacti have drip tip leaves?

Cacti do not have drip tip leaves primarily because they have adapted to arid environments where water conservation is crucial. Drip tips, which allow excess water to run off leaves in humid climates, are unnecessary in dry conditions where moisture retention is vital. Instead, cacti have evolved thick, fleshy stems that store water and spines that reduce water loss and provide shade, making them well-suited for survival in desert habitats.