Step-by-step explanation:
Rhizoids are root like structure, mainly found in fungi ( Rhizopus ) they anchor the ground floor, meaning that just like roots are deep down in the soil, Rhizoid also anchor below or in the substrate for eg. in Rhizopus rhizoid mainly penetrate the substrate making it simpler enough to be absorbed (Rhizoid is a type of hyphae).
Another reason is that, Rhizoid just as roots absorb nutrients, as mentioned earlier they penetrate the substrate thus making it sufficient enough to be absorbed by them.