1. Possesses a cell wall composed primarily of cellulose

2. Is autotrophic**, which means that it is capable of producing its own food from inorganic molecules using the energy from the sun through the process of photosynthesis

3. Lives on land, or in an aquatic environment without being permanently attached to the substrate

4. Has a well-defined nucleus and other membrane-bound organelles

5. Reproduces through the production of specialized reproductive cells called spores or seeds, or by vegetative propagation

Additionally, plants have a complex life cycle that involves alternation of generations between a diploid sporophyte and a haploid gametophyte.