Root- the roots anchor the plant into the place it it growing and the medium it is growing in. This enables it to take up water and minerals as part of the process leading to the plant making its own food.
Stem- the stem of a plant is designed to lid the leaves and flower in a position that enables the plant to get most benefit from the sun.
Leaves- the key function of the leaf is the process of photosynthesis.
Buds- buds are small undeveloped shoots that could be either new leaves or new flowers.
Flower- the flower is the part of the plant where seeds are produced as one means of reproduction.
For a more detailed look at the part of a plant and ideas and resources for use in the classroom download a copy of the SAPS booklet Parts of a Plant and their Functions.