The roots of plants.
plants need warter soil for anchorage and plant food sun light so that it can grow
plants prevents soil eroison
Anchorage
Roots in general provide anchorage to the plants
No, but they help the plants grow.
Non-vascular plants, such as mosses and liverworts, do not have special tissues to transport water and nutrients. Instead, they anchor themselves in the soil using structures called rhizoids. Rhizoids are root-like structures that provide anchorage, help absorb water, and aid in nutrient absorption, although they do not have the same complexity and functionality as true roots found in vascular plants.
it is rich soil for the plants' roots
This is how microbes help in soil fertility. -- Bacteria and fungi help in decomposing our waste products. The microbes also add minerals into the soil which are also sometimes absorbed through the plants
Plants use the soil for anchorage 2). The soil particles act to trap water between them allowing the plant to draw water from it 3). Depending on the coarseness of the soil particles the soil is able to contain air pockets in it allowing for the uptake of Oxygen into the plant 4). The nature of the soil allows nutrients and minerals to be attached to them, enabling the plant access to a ready store of nutrient "food" 5). To help them grow the minerals and nutrients help it grow instead of helping it die.
Soil provides minerals for plants, retains water so that plants can have enough time to absorb it, and helps to anchor plants.
Soil anchorage is not essential to literally all plants, but a great many (especially those we are most familiar with) must remain anchored. The root system of many plants hold them allowing the plant to maintain it's structure, gather nutrients, and obtain water, as well as providing protection for the often venerable roots.