Plants have organ systems like roots and shoots that carry out similar functions to animal organ systems, such as transport and support, but they are structured differently. Flowers are the reproductive organs of plants and function similarly to animal reproductive organs. The roots absorb water and nutrients for the plant; if damaged, the plant's health and survival are jeopardized. The document discusses plant and animal cells and organ systems at different levels of organization, from cells to tissues to organs, and assigns homework on labeling the parts and functions of a microscope.