Plants are organized into two main groups: seedless plants and seed plants. Seed plants are further divided into angiosperms, which have flowers, and gymnosperms, which do not have flowers. The main plant parts are roots, stems, leaves, and flowers. Roots hold the plant in place and take in water and nutrients from the soil. The stem transports water and nutrients between the roots and other parts of the plant. Leaves take in energy from the sun through photosynthesis. Flowers attract pollinators to reproduce seeds, and seeds develop into new plants.