That's a cactus
Cactus
A cactus has no leaves but does have a stem.
a cactus
One of the many cactus species
The pointy things on a cactus are called spines.
yes, it is, the leaf of a cacti plant is modified into spines in order to reduce transpiration. This is a method of desert adaptation.
Cacti live in the deserts of the Americas and many have sharp spines. In Africa there are other plants, euphorbias for example, that resemble cacti but have thorns rather than spines.
The ocotillo plant is a common desert plant found in the southwestern United States and Mexico that has thorns but is without leaves. It is known for its long, vertical stems covered in sharp spines, which help reduce water loss and protect the plant from herbivores. The plant produces leaves only after a rainfall to maximize its photosynthetic potential.
they have the spines to protect them from your face
Because they come from desert and they don't need to to much water.
Generically they are called "cactus" plants or "cacti"
Cacti are not thorny plants, they have spines. There are a number of desert plants with thorns, however, including acacia, mesquite, cat's claw, and others.