Some of them do and some varities don't. Here is web site I have found that's very interesting. The Barrel Cactus is used for candy, drinking and many other things. http://www.desertusa.com/mag99/june/papr/barrelcactus.html
Many cacti have a dense, wide-spread network of roots just below the surface of the soil so that they can absorb water even from a light rainfall. Some have roots that go deep into the soil to find moisture present there.
Of course, all plants in the desert need water. The cacti have adapted means of conserving and storing water.
b'coz they need less water to survive
The Simpson desert contains many types of vegetation including the Barrel Cactus, Organ Pipe Cactus. Saguaro Cactus, Prickly Pear Cactus.
Water, or the lack of water, has the greatest effect on cacti.
The fishhook barrel cactus is found in both the Chihuahuan Desert and the Sonoran Desert.
The desert lark eats seeds and insects and metabolizes food at a slower rate than other birds in other climates. The desert lark has adapted to living in the desert and can survive on minimal water as well.
A cactus competes with other plants for water.
You can find water in cactus.
The barrel cactus can be a plant that animals can get water from in the desert.
yes there is, you can get the water from the cactus.
a cactus holds water the most
The main plant that is in the desert is the cactus. Cactus are able to hold water for extended periods of time in order to survive.
Cactus
cactus need less water thus they grow in deserts
Some get the hydration from their prey, and some get it from the water in the desert cactus.
The cactus is one of the few plants found in the desert, and in order to survive it needs a massive amount of water. Since it does not rain all year round in a desert, cacti store water when it does rain. So the needles on the cactus protect their water-rich flesh from other things in the desert.
temperature, water and elevation
cactus