Refer to Scientific Method Guidelines. Plant needs include sunlight, water, air and nutrients to grow and survive. Most plants have roots, stems, leaves and flowers. Roots absorb water and nutrients and provide support for the plant. Stems transport water and nutrients and support the plant.
Leaves absorb sunlight and air to make food for the plant.
Flowers produce seeds for reproduction. Seeds have an embryo and food supply. Some plants reproduce without seeds. Fruits develop from the flower of a plant and contain seeds. Vegetables are the root, stem or leaf of a plant.