A Cactus has roots to absorb as much water as possible when it rain also to support the Cactus when it bad weather such as wind.
A cactus has roots just as do other plants. These roots absorb water from the soil when it is available and store water in their tissues for ties of drought.
Cactus have fibrous thread like roots so they can absorb water even in the smallest quantity.
it absorbs more water
The water comes from the soil which receives the water from rainfall.
In the stems. It grows it's roots far out to get nutrients and water from the soil.
one thing you can do is throw bowling water to the roots (bottom of the cactus) another thing you can do is throw some dirty car oil to the rootsDig it out from the roots.
As with all terrestrial plants, cacti absorb water through their roots.
The roots to a cactus are long thick and go very wide and deep. When it rains the roots absorb the water and store it in its leaves. The cactus doesnt need a lot of water. A couple drops a year will keep it alive. Its leaves are protected with spines.
The roots absorb water and that makes the stem grow
Cacti have fibrous roots to efficiently absorb water from the soil and store it in their stems for extended periods of time, helping them survive in arid environments with limited water availability. The fibrous root system also helps anchor the cactus in the sandy or rocky soils where they typically grow.
It would let excess water contact its roots causing the cactus to drown and die.