How do the shallow roots of a cactus help it survive on a desert ecosystem?

The shallow roots of a cactus enable it to quickly absorb moisture from light rains or dew that may not penetrate deeply into the soil. This adaptation is crucial in desert ecosystems, where water is scarce and often fleeting. Additionally, the extensive lateral spread of these roots allows cacti to capture water over a larger area, maximizing their chances of survival in harsh conditions. This efficient water uptake is essential for their growth and reproduction in arid environments.