(a) Root: They absorb water and minerals from the soil, thereby providing the important nutrients to the plant.
(b) Stem: They keep the plant upright. They transport water, minerals and food to all parts of plant.
(c) Leaf: The most important function of leaf is to prepare food via photosynthesis.
(d) Flower: The main function of a flower is to provide a platform for reproduction. It contains stamen as male and pistil as female reproductive parts.