1. Support: The stem provides structural support for the plant. It helps the plant to stand upright and resist bending or breaking. This support is especially important for plants that grow tall or have heavy leaves or flowers.

2. Transport: The stem transports water and nutrients from the roots to the rest of the plant. The water and nutrients are absorbed by the roots from the soil, and they are then transported up the stem to the leaves. The leaves use the water and nutrients to produce food through the process of photosynthesis.