Because they are plants, the roots are used the same way in cacti as in every plant, to take in water for the plant to use.
Some cacti have shallow roots. Other cacti have long tap roots.
cacti have long roots to soak up all the rain water
To adapt to the environment they are in.Example:Some cacti have their roots deep in the ground, to get groundwater.Some cacti have their roots spread out, to catch rainwater. Their roots also secrete an acid that makes it difficult for other plants (including other cacti) to grow on those roots. This limits the competition for water.
To adapt to the environment they are in.Example:Some cacti have their roots deep in the ground, to get groundwater.Some cacti have their roots spread out, to catch rainwater. Their roots also secrete an acid that makes it difficult for other plants (including other cacti) to grow on those roots. This limits the competition for water.
Some cacti have a tap root while others have a dense fibrous root system.
overwatering will cause the roots to rot
Cacti obtain their nutrients from the soil via their roots.
Cacti get water from rainwater that is stored in the special roots of the cacti
Cacti have very strong roots that go deep into the Earth searching for water. Since they go so far, they must be very strong. The stronger the roots, the deeper they search for water. Roots secure plants to the ground, but some can't. Cacti can.
Cacti is the plural of cactus. A cactus is a plant and isn't an anything~ivore. It lives by absorbing water and nutrients from its surrounding soil, through its roots.
As with all terrestrial plants, cacti absorb water through their roots.
Cacti seeds are carried to new locations by the wind, water, humans, and in the droppings of animals. Cacti seeds germinate on top of the substrate they are on, so this makes them highly versatile.