Answer:StemThe stem is the part of the plant that grows straight up out of the ground and is the basis of the shoot system. The stem provides structure and support to the rest of the plant, keeping it upright and being the part the leaves and flowers grow off of. It is also the main transportation route for water and nutrients from the soil to travel up to the other parts.leavesThe leaves are the flat, green part of the plant where most photosynthesis happens; the process that makes food for the plant. The leaves contain chlorophyll, which takes water and sunlight and changes it to create glucose; food for the plant. Leaves also help to regulate the temperature of the plant. RootThe root is found underground. It anchors the plant and helps it absorb water and minerals.